Transcript

00:01Alright, welcome to Best Practices for Designing Effective Map Services. We're glad you chose to come here.

00:06This…learn about this subject this morning.

00:08My name is Sterling Quinn. I'm a product engineer on the ArcGIS Server development team.

00:13I work out of the Olympia, Washington, office.

00:16With me is Tanu Hoque. He's on the…he's product engineer on the map team in Redlands.

00:22So we'll talk today about designing and planning effective web map services.

00:27We'll talk about the transition from going from a desktop map into a web map…

00:32…and some of the things you have to think about in order to get the best performance and visual quality of your maps on the web.

00:40So we'll talk about three ways to serve maps.

00:41We're going to go into great detail about why you would choose these three techniques in one.

00:46Cache tiles, a dynamically drawn map service, and then client-side graphics that are actually drawn by the web browser itself.

00:53We'll talk about how to author a nice-looking web map, and then we'll give some performance tips at the end…

00:58…and we should have time for questions and answers at the end of the session.

01:01So if you see something that causes a question, please jot it down. Be happy to talk to you about it at the end.

01:10When planning this session, we thought, you know, how much web maps have changed over the years.

01:15It seems like this convention center is always the same, same old chairs and everything…

01:18…but the technology really, really changes.

01:20This is something I pulled out of the help for ArcIMS from years ago.

01:23I don't know if that's Internet Explorer 4 or 5 that really…

01:29…things have really changed, and, we think, for the better.

01:34It's often…we've seen that a lot of people have moved into the server world from just working in pure desktop GIS.

01:41And one of the main things to consider as you do that is how you're going to expose your GIS maps as web services.

01:47Often, it's not as simple as just going from a desktop map and clicking a button and putting that straight onto the web.

01:55What we've found is most effective is that you break up your layers from your map into separate maps…

02:02…one containing your basemap, and other maps containing your operational layers or your business data.

02:08So the basemap gives a geographic context to your web map.

02:13It's not really the reason that people are going to the map, usually.

02:16We don't often go to a web map just to see the basemap, unless you're going to maybe a new place like San Diego…

02:22…and you just want to explore the layout.

02:24But typically, it's going to be in the background, and it'll be reused in multiple applications.

02:28Think about that Google Maps basemap. How many websites do you see that map on?

02:33If you go to shop for a house, sometimes you see Google Maps in the background, or if you go to locate a restaurant…

02:39…maybe they've got Google Maps pulling in their basemap. These basemap web services have become very popular.

02:44Now, it's not always the case that you can just pull in an existing basemap from ArcGIS Online or from Google.

02:51You have to make your own, so we'll talk a little bit about that today.

02:54The other types of web services that you might want to expose are your operational layers…

03:00…and these are really the reason that people are visiting the map.

03:02Often, this represents your proprietary data, or your data of study…

03:07…whether that's wildfires or weather or crime incidents or what have you.

03:13This is often the reason people are viewing the map, and you put them on top of the basemap.

03:17You often symbolize them with larger or brighter symbols than you would basemap symbols.

03:24So it pays off and to think about your, your map documents that you have…

03:28…and maybe use a whiteboard to draw out which layers will go in my basemap…

03:33…and which layers should be exposed as operational layers.

03:36Google Maps really changed our way of thinking, MapQuest and those, those types of commercial mapping sites.

03:43It used to be that…I guess it was a hard pill to swallow for GIS analysts to put up a web map…

03:51…and not have people to be able to turn on and off every single layer and reorder all the layers and things like that.

03:57Google Maps changed the game in this regard.

03:59We did a little study where we looked at all the layers that are inside the Google Maps basemap…

04:04…and that thing is just called, I believe it's just called Map on the button that you click.

04:09And I've never heard anybody complain that they can't turn on and off the golf courses in Google Maps.

04:14People have just learned over the past few years, I believe, to take these basemaps as they are…

04:19…and they realize that in most cases, that's not the reason that they're visiting the map, and as a result…

04:26…the map has become simpler to use.

04:29Let me just bring, bring up that website.

04:33So the map is very easy to use. How many buttons are there here? Is there a big layer list with a table of contents?

04:38There's not, but even still, my sister, my grandma, my dad can use this map site just fine.

04:45And that's because of some of the usability that they've put in, and people also like this map because it's fast.

04:52You know, as I zoom in, I don't see the map loading.

04:55Maybe for a brief second, I see a tile off on the side of the screen come into my browser.

05:01That's the performance people have come to expect from maps, and we'll talk about, today…

05:05…how you might be able to achieve that.

05:07So Google Maps has a couple of basemaps. How about operational layers? Here's an example of one – that's traffic.

05:14So you can turn this one on and off, and that might be the specific reason that somebody comes to this map.

05:19It's to see, what's the traffic like today? Same goes for photographs.

05:24You don't always want to see those, but if you're interested in what things look like…

05:28…you'll want to turn that layer on and maybe later, turn it off.

05:32So these are a couple of the operational layers that are inside of Google Maps.

05:38Now when you go to design your own maps, you'll think about these things…

05:41…and you can certainly take this approach using ArcGIS.

05:45In fact, we pulled up just some of our favorite sites that use this…

05:49…to show an example of separating out basemaps and operational layers.

05:53So let me take you to one that I like. This is District of North Vancouver in British Columbia.

06:02And you can see, they've made some basemaps here that perform pretty well, and they look very nice.

06:09Now, these are meant to have other layers displayed on top of them, so they've provided operational layers, such as bus stops…

06:15…that you can turn on and off, or bike routes.

06:20They've also provided a number of different basemaps…

06:23…so if you want to see this on top of neighborhoods, for example, you can easily switch between the two.

06:29So they've obviously put a lot of thought into the types of layers they want to have in their different basemaps...

06:34…and then what operational layers they want to expose.

06:37It looks to me, just by examining this map – I haven't talked to these folks, but it looks to me…

06:43…that they have a separate service for each basemap, and then they have just one or two services for the operational layers.

06:50The operational layers can be turned on and off because they are not cached, like the basemap is.

06:56And so we'll go into that a little more later.

06:59Another option, or another website that I like is the Solar Boston website. We saw a little bit of Boston GIS in the plenary.

07:06They've made this site showing solar potential at different sites around the city of Boston.

07:12And you can see that they've added their own cartography and style to the basemap, and they've provided some buttons…

07:19…where you can switch between different basemaps, so you can get the aerial photograph view if you want.

07:24Now, they have an operational layer on here, too, and that's the Solar Potential Sites.

07:29As I mouse over this, you can see that that layer changes.

07:32Often, operational layers are interactive. They invite people to click on the map and learn new things.

07:42Tanu will talk to you a little bit later about how this is drawn with client-side graphics…

07:46…and that allows it to, to symbol, to dynamically change as I mouse over it.

07:49And then I can show some extra information like a picture and attributes on this map.

07:56So those are just a couple of examples of how people have used ArcGIS to think through and build basemaps and operational layers.

08:06Today, we'll talk about three techniques you can use when displaying map services, the first one being cached tiles…

08:13…and then we'll talk about dynamically drawn images and Tanu will talk about client-side graphics.

08:20We've already seen a couple of maps that use map caching.

08:22Those basemaps from Google Maps, all of the basemaps that you saw in Solar Boston and North Vancouver…

08:27…all of those basemaps were cached so that they could have high cartographic quality but, at the same time, perform very quickly.

08:33When you create a cache, you draw the map over all the scales of the map at its full extent…

08:39…and you save those map draws as image tiles on your server, and that way, when somebody visits an area of your map…

08:46…your server just hands it the tile. It doesn't have to do the work of drawing the map at that time.

08:52It's a lot faster for a server to just hand out tiles than it is for a server to draw the map and send it back.

08:59This has really become a web, a web standard.

09:02One thing that it does require you to do is maintain the cache.

09:05Now, this can be tricky if your cache covers a whole country or the whole world at very large scales.

09:10That winds up being a lot of tiles. What happens if your data changes underneath that?

09:12That won't be immediately reflected in the cache because the cache is basically a snapshot of your data at one point in time.

09:15So you need to rebuild those areas of the cache that have changed, and in this way…

09:25…a cache requires maintenance and server power to build and store those tiles.

09:33We recommend that you cache your basemaps to your web applications in most cases.

09:38You can also cache operational layers sometimes.

09:41In fact, if you're going to be experiencing very high volumes of traffic, you might consider doing this.

09:47Google Maps, from what we can tell, has cached their photographs in Wikipedia entries.

09:53Now you may think, "Wikipedia – that's something that people are adding to and removing from every day.

09:57How can you cache that?"

09:59Well, in their case, they've determined, apparently, that it's okay to just update that at certain intervals.

10:05Maybe once a week, they rebuild that cache, or once a month.

10:08You know, and if somebody added an entry within the past few days, maybe it doesn't show up…

10:13…but they've just decided that that's okay for their cache. You may need to make decisions like that.

10:18You know, do I need to see certain updates to my data in real time…

10:21…or is it okay to wait one day and then I can just rebuild a cache overnight? You'll need to think about that.

10:28Some things don't change very often, and if that's true over a small area, over just a few scales, then you may consider caching.

10:37And then, some things are, tend to be viewed just at small scales. I'm talking about when you're zoomed out on your map.

10:43Now when you're zoomed out, that cache is a lot easier to build because it takes a lot fewer tiles to build those levels.

10:50So here I have a tile in the lower right that shows weather radar, and you may think…

10:55…well, the weather changes all the time. How would I cache that?

10:59Well, this type of data is something that people tend to look at at very small scales.

11:03It's very rare that you would zoom in to your city block to see if it's raining on the next street over versus your own street.

11:09So people are going to be zoomed out typically.

11:11Well, in that case, you may be able to build the first 10 levels or 15 levels of your cache fairly quickly…

11:17…and you update your cache maybe every 10 or 15 minutes, and this can certainly be done with things like scripting.

11:25All of map caching in ArcGIS is done with geoprocessing tools that can be automated.

11:29So you may set up your automation to occur, or your automated caching to occur on a regular basis.

11:37I'm not going to go into all the cache formats.

11:39I love talking about caching; I could do it for a couple hours. That's not the purpose of this session.

11:43But I did want to bring up one property of your cache where people tend to make the most mistakes…

11:50…and ArcGIS Server 10.0 introduced the mixed-image format for your cache.

11:56When you go to build a cache, you have to choose an image format. You can choose JPEG or PNG…

12:01…and now, you can choose mixed, and mixed, what mixed is…

12:04…is it has JPEG tiles in the center of the cache. JPEG is desirable because it has a relatively small file size on disk.

12:13The mixed cache on the periphery has PNG tiles, and that allows the transparency to work.

12:20Transparency is not available on raw JPEG images.

12:24So you have this type of cache. We have PNG on the periphery and JPEG in the center.

12:31You can change the JPEG image quality on these caches.

12:34If you have vectors and line work and labels, you probably want to have a higher quality…

12:39…around 90; we've found, that works okay.

12:42If you have imagery, you can get away with a lower quality…

12:45…and then you can wind up taking up less space on disk with your cache, so that's one tip.

12:51If you have a type of cache that's just an overlaid network of roads or boundaries…

12:55…where transparency is going to be almost everywhere, then you'll need to use the PNG format.

13:00And if you have under 256 colors, you can get away with PNG-8, which is probably...

13:05…which is one of the smallest image types.

13:08So you need to be thinking when you choose your image format, how much space on disk am I going to take…

13:13…and how large are these tiles going to get, and will they be, easily be able to be download…

13:18…will they be able to be easily downloaded to the browser?

13:24If you want to get into more of the caching properties that are available and how to choose these wisely…

13:29…there's a couple of sessions. Well, we missed the Wednesday, eight-thirty. But there's one tomorrow on beginning caching.

13:35That's the top one. And then, if you're going to be building caches that cover, like, a whole country or the world…

13:41…down to very large scales and you need to get some guidance on that…

13:45…then this advanced map caching topics would be a very good one to attend later today.

13:52If you're not going to build a cache, another option is to do a dynamically drawn map service.

13:57This is the default in ArcGIS Server when you publish a map service.

14:00So if you've never built a cache before, you've probably been using this way to draw your map services.

14:06In this scenario, the server actually receives a request from a website to draw a map, and it will do the work to draw the map…

14:13…and then it will send back the image to the, to the requesting client machine.

14:20Now, this is slower than caching, but it may be that you can get satisfactory performance out of it, as well…

14:25…if you follow some best practices.

14:31Obviously, if you need to see your data in real time, you won't be able to cache it, because the cache could go out of date.

14:37So it may be okay to draw real-time data dynamically.

14:41Also, if your data is changing all over the map and it would be unfeasible to maintain that cache…

14:48…dynamic drawing is, is an option.

14:50And then, if just a few people are going to access your map within your organization…

14:54…maybe you're working on a research project with just a few other folks…

14:58…in that case, it may not be worth it to go through the hassle of maintaining a cache.

15:02A good rule of thumb is if performance is good enough for you, you may not need to go beyond that.

15:09Why do the, why do extra work if it's good enough?

15:12Now, one thing you want to think about is scalability.

15:15It may be, appear good enough to you as you create the app, but if hundreds of people are going to hit this at one time…

15:21…it may need to be super good and be able to be more scalable, and that's where caching is actually better than drawing dynamically.

15:31In ArcGIS Server, there are two types of files that you can use to create a map service.

15:36On the right is the one that you know and love, the MXD map document. That's what you make in ArcMap.

15:43And for the first few releases of ArcGIS Server, this was the only thing that you could use to create a map service.

15:49And consequently, this one used the traditional map drawing engine that was used by, by ArcGIS.

15:55After a few releases, we found that that was not yielding acceptable performance in many scenarios…

16:02…where people needed to do dynamic drawing.

16:04So at 9.3.1, we wrote a new drawing engine that was optimized for the server, and in order to use that…

16:11…you need to make an MXD, or Map Service Definition, file and publish your map service using that.

16:17Raise your hand if you've used an MXD to publish a, a map service in the past. Okay, so a little more than half, or about half. Good.

16:28So the way you get an MXD, I will demo in just a second.

16:31You use this toolbar that looks a little fuzzy here in ArcMap. It's called the Map Services Publishing toolbar.

16:37So if you see me use these tools in the demo, that's where I got those.

16:41MXD supports many of the most common layer and symbol types.

16:46You'll see that there's a few things that are not supported, and we'll teach you how to detect those.

16:51And we found that in most cases, these yield faster dynamic drawing than ArcIMS, so that was our…

16:59…our benchmark when developing that drawing engine, and we feel like we reached that point.

17:03And we encourage you to use these MXDs, or what I'm going to call them for the rest of the presentation is optimized map service.

17:10So when I say optimized map service, I mean MXD-based services.

17:15Let me show you how to create one. I'm going to open ArcMap, and even if you've created one before…

17:20…hopefully, this little demo will be helpful in just showing the processes of working through and removing some performance bottlenecks out of your, out of your maps.

17:29So I have already right…right-clicked. I've displayed Map Service Publishing; that's the toolbar up at the top.

17:35And typically, you work from left, left-to-right fashion when using this toolbar.

17:40So the first thing I'm going to do is click Analyze…

17:43…and this brings up a report of potential things that are not supported in optimized map services.

17:49And also things that might cause performance problems, and I'm going to go through and fix some of these during this demo.

17:58The first thing that I see is an error, and error means…

18:01…you have something in your map that will not allow this to be published as an optimized map service.

18:05It's telling me there's a layer type that's not supported.

18:08Now, this is pretty easy to spot because I have a small table of contents, but…

18:12…if you had a large table of contents or you didn't know what that was…

18:15…you could right-click this and choose to select the layer in the table of contents.

18:21If I investigate this further, I find that this is a geoprocessing tool layer.

18:25Now, sometimes that's used in ArcGIS Server to be able to run a geoprocessing model within your map...

18:30…and see the results on the map.

18:33Now, there's other ways to do geoprocessing in ArcGIS Server, and if I really needed this…

18:38…I could take it and put it in another map document and publish it separately.

18:42What you want to do is try to get out all the things that will prevent you from publishing as an optimized map service…

18:48…and move those into their own documents or work around or get rid of them.

18:52So I'm going to remove this from this map, and when I reanalyze, it goes away.

18:57And now, I just have warnings and messages, so at this point, I could publish this right now as an optimized map service.

19:05I also now have a Preview button available…

19:08…and this allows me to preview what the map would look like when drawn as an optimized service.

19:14One thing that's cool about this – well, I'll show you a couple things.

19:18One thing that you might notice about optimized map services is…

19:21…this image quality seems a little better than the one in ArcMap.

19:26One subtle thing is that this applies anti-aliasing, and it can do it rather quickly.

19:31So anti-aliasing is a way of smoothing out the lines of…smoothing out the edges of lines in text that may appear jagged.

19:40If you look closely at this highway, you may see some pixilation; also, a highway that runs diagonal.

19:47These look a little bit smoother over here in the optimized map service.

19:51Now previously, it was…

19:53…you had to pay a cost to get this. You had to make a cache, and you had to turn on anti-aliasing, and it took a lot more time.

20:00Optimized map services apply anti-aliasing very well.

20:03When you zoom in and pan around, you can see the dynamic drawing happening.

20:09And each time, it's giving me the time that it took to make that previous draw.

20:14So you can watch this time as you go about fixing errors and warnings, and hopefully…

20:21…well, the idea is that it will go down as you fix those.

20:23And then when you get to a point where performance is acceptable for you, you can go ahead and publish the map to your server.

20:31If you want to change that anti-aliasing level or if you don't want to have it, you can use this button on the far right…

20:37…and you can change it to maybe work in a faster way.

20:41So you can choose a balance between quality and performance.

20:45It does cost…it does introduce a performance cost to use anti-aliasing, so you might want to experiment with those settings…

20:52…and then go back to the Preview window and see if the visual quality is good enough for you.

20:58Let's work through a few more of these errors and warnings.

21:01Here's a warning that's telling me that I've got a layer in my map with a different projection than the data frame's projection.

21:07Now this means that projection on the fly is occurring in my map document…

21:11…and projection on the fly is calculation intensive.

21:15If you can eliminate that, then you'll free up time and ability on your server to serve more maps.

21:21In my case, I'm just going to right-click and choose Change the Data Source Properties.

21:26To prepare for this demo, I already reprojected this layer. It's the hillshade layer.

21:30So I'm just going to switch it out for the projected one, and that goes away.

21:36It tells me to reanalyze here, and if I reanalyze, it goes away.

21:41Another thing it's telling me is that there's a layer in my map that doesn't have a spatial index built.

21:46Now, a spatial index is a way in ArcGIS of cataloging the general spatial locations of certain features…

21:52…and then that allows for faster map drawing within the software.

21:56And so if you take time to build these spatial indexes for your layers, they'll appear faster both in desktop maps and in web maps.

22:04You build a spatial index using a geoprocessing tool, and one cool thing about this message is I can right-click it…

22:11…and it just brings up the tool for me with all the parameters filled out in order to build that spatial index.

22:17For demo purposes, I choose a very…I chose a very small layer so that we could do that quickly.

22:22Sometimes it takes a while to build a spatial index, so you'll want to plan that into your…

22:26…into your timing for optimizing a map.

22:32Here's another error and warning, and sometimes you'll come across ones that you don't understand immediately.

22:38When I saw this, I didn't know what it meant. It says…

22:41…if I convert layer transparency to color transparency, that might improve performance.

22:46If you see a warning and you don't know what it means, you can right-click and choose Help.

22:50Each of these warning and error codes are associated with a help topic, and that will just pop up automatically when I choose Help.

22:57So this gives me all kinds of information about the types of transparency I can use.

23:02To make a long story short, if I choose Color Transparency, it's a way of precalculating some of these transparent colors…

23:09…instead of applying them in real time, so that can improve performance.

23:13And if I want to use that, it's as simple as just right-clicking, and I choose Use Color Transparency.

23:18When I save out the MXD file, that will be a property in the file that will just be applied for me.

23:25There's another one that could be tricky to understand just if you saw it for the first time.

23:30It's saying I have a multilayer line symbol whose symbol widths may result in aliasing when displayed.

23:36Now, to explain this one, it's easier just to show it.

23:41When I zoom in, I've got some streets here that are symbolized with a multilayer line symbol.

23:47Now, the optimized map service actually interprets line widths a little differently than ArcMap…

23:52…and that's resulting in some overlap here, where my lines don't look good.

23:57Sometimes the casing disappears.

23:59Now, there's an automatic correction that you can apply for this. It's pretty easy.

24:03You just right-click and choose Automatically Correct Line Width.

24:06So I'm going to do this on each of those layers where I get that warning.

24:12I'm going through and doing a number of these in sequence.

24:17It'll probably happen to you when you analyze your map that you'll see a number of these repeated warnings…

24:21…so what I'm doing here may not be too far off from what you do.

24:26My enhancement request, I'll submit right now to Tanu, is for a multiple select right here on this, on this dialog.

24:34It's Notepad.

24:35Good. Yeah, on your user ID is Notepad that you get; put that down. There we go.

24:41So I resolved all of those warnings, and now I'm just left with some informational messages.

24:47This'll tell me things like, well, you forgot to set up a scale range on your streets layer, for instance, so…

24:53…are you sure really want that? Because when people zoom way out, they're going to be drawing all your streets.

24:58In my case, I'm not too concerned about this for this demo map.

25:03Occasionally, the optimized map service will show certain symbols a little differently, like…

25:08…it tells me about a gradient fill.

25:10If I'm concerned about that, I can just use the Preview window.

25:14I've got a gradient on this runway, but it looks okay to me, so I'm just going to ignore that.

25:20And as we pan around, my performance is still pretty good, and I think I'm ready to just go ahead and publish this as a service.

25:29At this point, you can go one of two ways.

25:32What most of you will probably do is just click this button to save out the map service definition file.

25:38I recommend that you go and you just save this in the same place as your MXD.

25:42It needs to be in a location where ArcGIS Server, the ArcGIS Server account has access to read it.

25:47The other thing you can do that's kind of a shortcut, if you have admin rights to the server…

25:52…is you can just click Publish to ArcGIS Server, and this'll set things up to run right, right away and publish as a service.

26:01So I have this little wizard that I use to publish a map service.

26:04I want to point out something here, where you choose the capabilities you want to enable.

26:09If you use optimized map services with 9.3.1, there are only, I think, three capabilities that you could do.

26:15You could do mapping, WMS, and KML.

26:18With 10.0, we've added a bunch of the other capabilities, including some of the OGC ones, WFS, WCS.

26:26And then you can also develop, if you're developing server object extensions…

26:30…this is sort of an advanced topic, but those are also supported with optimized map services…

26:35…if you program your server object extension in a certain way, so we've documented how to do that.

26:41So really, there's a lot more ability to use these optimized map services as the releases go on.

26:49That's the last page of this wizard.

26:52Now when I click Publish, it's making a service, and I also want to show you what's being created on disk.

26:57So I have ArcGIS Server installed just with the default server directories, and if you're new to optimized map services…

27:05…this may be a new one for you – ArcGIS input.

27:07That's where all of your MXDs are created when you use this shortcut to publish straight out of ArcMap.

27:14So if I go into this folder, I can see the Map Service Definition file got created.

27:21Now let's just give this service a try by viewing it in a blank map. Oh, here's something to point out.

27:26It's asking me if I want to save the changes to this map document.

27:29So, even if you save out a map service definition, it has no intelligence about its associated map document…

27:37…and you have to save both in order to keep both of them in sync.

27:40So this means that if I go back later and I change this map document, I need to resave my map service definition…

27:47…and then refresh the service, stop and start the service for it to pick up the changes. So I'm going to choose Yes here.

27:56So I've got a blank map, and let me…whoa! Too many windows in this new 10.0.

28:04Okay, I'm going to view the Catalog window, and this is my ArcGIS Server and I'll just refresh it here.

28:12Here's the one I just published, and let's add it to ArcMap and test out the performance.

28:20So if you look closely, you'll see that the anti-aliasing has been applied here on the roads. That looks very nice.

28:27And I'm going to zoom in and just do some dynamic draws.

28:32And the performance of this service is as good as it was in the Preview window.

28:37You'll notice that the label positions are changing as I pan around, so that thereby proves that it is a dynamically drawn service.

28:44If you wanted to improve performance even more on this, though, you might create annotation for these labels.

28:50Annotation assigns each label a certain place on the map…

28:54…so that the map doesn't have to make label placement decisions every time that you pan or zoom.

28:58So that's another way you can even squeeze out more performance.

29:07I already talked about this with anti-aliasing. You can see again, in this example, its effect.

29:11This might be a little easier to see than the demo I was doing.

29:19You might be wondering what types of layers are not available or what's available through optimized map services.

29:25That's available in a help topic that we have. It's called Supported Functionality in MXD-Based Map Services.

29:34So we list everything that's available, and you'll find, I think, most things in your map are going to work.

29:44…that you've got one of those, you'll see that bright red warning, error pop up…

29:48…and you won't be able to use the optimized map service until you move it out of that map.

29:49Certain things, like TIN layers, Network Analyst layers, are not available, and if that's the case…

29:53Some new features that are available in the optimized map service at 10.0 include Maplex labeling and cartographic representations.

30:03These two things, by nature, are computation intensive, so they will be in many cases slower than if you did not use them.

30:12However, they're available to you. You have the choice of whether you want to use it or not.

30:17And if you feel like they're still too slow, you might consider making a map cache then.

30:22And once you have those cache tiles, it doesn't really matter whether you use an optimized map service or not.

30:28You're just handing back the tiles.

30:30In my case, I actually had a basemap of Mississippi, and you may be thinking, well, aren't you just going to cache that basemap?

30:37You know, why do you go to the trouble of making this optimized map service for dynamic drawing?

30:42The answer is that if you optimize the drawing performance, the cache will build faster.

30:46So if you have a cache that's taking you hours or days to build, you might go through the process…

30:52…of making the optimized map service just so that it will create your tiles more quickly.

30:59If you are not able to use the optimized map service for whatever reason…

31:04…we recommend that you still work as hard as you can to improve performance…

31:09…either getting out those unsupported layers and putting them in their own service…you might attempt to use…

31:14…the Esri optimized style for drawing, although I talked to one of our cartographic researchers today at Esri…

31:21…and he says he doesn't get the visual quality he likes out of that one, but it is an option to you.

31:26This uses very simple symbols for drawing that are designed to work faster.

31:31And the real secret here, the thing I would recommend for everybody to do, is still…

31:36…use that Analyze button to catch performance warnings, 'cause some of these…

31:39…the nature of these warnings and errors that you see will help you whether you're going to publish your map to the web…

31:45…or not, or whether you're going to use optimized map service or not.

31:48These are things - like projection on the fly, missing spatial indexes - you may not have ever noticed before.

31:54This toolbar can be very helpful in any ArcMap scenario.

31:58Now you probably won't go through all the steps of saving out the MXD in publishing…

32:03…but you can always use the Analyze button to help you.

32:08With that, I'm going to switch things over to Tanu...

32:12…and he's going to start talking about client-side graphics, the third option.

32:43Alright, can you hear me now? Everyone good? Alright. Good morning. So how is everyone doing? Good?

32:52How about your legs? Are they doing good, too, from walking all three days? Good.

32:58This is my yearly walk-around, actually, once a…once a year, I do. So, anyways. Quick question.

33:06How many of you never, ever use client-side graphics? Never used client-side graphics. Some of them? Okay, don't…

33:15…don't lower your hand right now. I have another question.

33:18Okay, now lower your hand if you use Google Maps, Bing Maps, Yahoo! maps or similar technology, then lower your hand.

33:27Okay, so most of the people use this one, right? So, okay. Why I ask you the question? I'll get back to you in a second.

33:33Before I do that, I have my Google map application right now over here.

33:38So all I want to find out is how I can go back to my office, back in Redlands…

33:43…something that we all do very often.

33:46So to do that, I need to find out where I am right now.

33:49I look for the San Diego Convention Center, I see a little pushpin, I click on it…

33:54…brings up some information. There's an option called Directions. I click on it, and there I am asked for the destination.

34:02I'll say "Esri Redlands headquarter." It's amazing. They find it out right away. Yeah! They're tracking all of us.

34:12Okay, it shows the route in blue line. Alright.

34:16Now, what I want to do is, since I love, take a peek of ocean when I'm driving…

34:22…which is not recommended, by the way, so what I'll do, I'll…still a good idea to travel on Interstate 5.

34:29To do that, I'll just click on the blue line and move it on the Interstate 5, right?

34:36And that gives me a fabulous route with an ocean view, which is mainly blocked by hundreds of trucks and cars, right?

34:44So, anyways, I get my result and the thing that I was clicking here, this pushpin on the blue line?

34:52That's what we call client-side graphics, alright?

34:56So those who of you raised your hands before that you never use client-side graphics, now you know…

35:01…that we have been using client-side graphics, one way or another, you know, with one application or the other application…

35:07…pretty much very often, and we did not recognize that we have been using client-side graphics. Alright.

35:14So think for a moment, what this client-side graphics did to this application. Alright.

35:21This make this Google application very interesting, gives a very nice user experience…

35:27…and more importantly, it makes this very intuitive.

35:31So while I was preparing for this presentation, I realized that the very first time I used Google Maps…

35:37…no one actually taught me how to use it, right? Did anyone teach you how to use the Google map? No. Oh, there's one! Okay!

35:48Okay, but most of us, no, right? So this is, we're living in an age where we…we're living now, what do you call, the click?

35:56Age of clicking? Everything, something pops up on the window, on the monitor - we have a habit to click on it. Alright.

36:03So that's what I was doing. I see something popped up on my monitor; I just clicked on it, and I see something comes up.

36:10So that's the power of client-side graphics, and that's what we consider client-side graphics as a key to interactivity…

36:19…and an important factor to make the intelligent web map that they have been talking in the plenary on Monday, alright.

36:27So now that we know what it is, let's see how it actually differs from the other two approaches, what Sterling said before.

36:35The other two approaches, the client-side application, actually play a very dumb, stupid role.

36:42All it does, it sends a request to the server, says, "Hey, server, give me a map for this particular extent."

36:49Server does all the heavy lifting, pulls the geometry and the attribution from that database…

36:56…draws them with the appropriate symbol, export it out to an image, and send that image back to the client.

37:02And client's application just simply paints it on that browser. Alright.

37:08With this client-side graphics approach, the client is the smart one this time, like a smartphone, right.

37:15So instead of asking for the image, it asks the feature which includes the geometry and the attribute from the server.

37:24So once it gets back, it takes full responsibility of drawing it with appropriate symbol on the client side. Make sense?

37:35Okay, there are…where we can learn about this one, or how you will use this…

37:40…with all of our web APIs, like JavaScript, Silverlight, Flex APIs…

37:45…they all support that - what they call feature layers.

37:49So if you use a feature layer, it will do the same thing for you, so you don't have to write any single line of code to do that. Alright.

37:57Now there are two approaches you can take. One is, you can download all the geometry at once and hold onto it…

38:04…or you can download those features as you need it, right, which is the on-demand case.

38:10Speaking of that one, I'll take you back to another, a new application that…

38:16...web application that came up just a few weeks ago.

38:19I don't know many of you noticed this one. This is called Passage 2011.

38:25There were two artists in Europe. They actually decided to take a boat all the way from Berlin to Venice over the Alps.

38:35Don't ask me why they did that, okay?

38:39So I just zoomed in to one interesting area, and this site [was] actually hosted by Esri Germany.

38:45So I see the redlines, the solid one, dotted line shows the path, the plan or the path they actually, in fact, the two.

38:53They show up. As I zoom in…

38:54…I see some of the boat's location pops up; that shows the location where they actually blogged or took some photos.

39:03And in the lower left corner, I see a graph, and you see that. There is something interesting.

39:07I will just grab that. As I move my mouse over it, I see some information pops up.

39:13That shows what is the altitude and what is the distance from the basemap, base camp.

39:18And if you look at the, on the map, you'll see that there is a little red crosshair. Can you see that? Right?

39:24That actually shows the graph is location aware. Very smart.

39:30So what if I click on this boat? I can see that it pops up information that shows the blog they posted and some of its images, right.

39:40So let's see what happens behind the scene.

39:42So I'm clicking this Firebug. Many of you know it. Those who don't know, Firebug is an add-on to Firefox's browser…

39:50…that helps you, number one, debug your web application; number two, it helps so you can monitor network traffic activities.

39:57So I just happen to click another boat on it. So what happens is that there are two…

40:02…only two requests went out of the server, and both of them are JSP, JPEG file…

40:08…bring down their images, right.

40:10If I click on the same image again, there will be nothing went…went back to the server. That's because of all the cache.

40:17I could – but we did not see the one request that I would have expected to go out, is that…

40:23…to the server, to the map service, asking for, hey, please give me the information about that boat.

40:28There is no such thing on, going on.

40:30The reason it's not happening is because of this magic of client-side graphics.

40:35Because we downloaded all the graphics with the attributes and this blog post on the right side…

40:40…and the image of the videos on the lower right corner, that happens to be the attribute information of that feature…

40:48…and you're just pulling it from that memory and showing it.

40:51So deep…it actually demonstrated a very important point of client-side graphics, that it off-loads the work from the server.

40:59Since it downloaded everything from the server, it holds onto that one.

41:04It doesn't have to go back to the server and bring that information again until exited out and go back to this application. Alright.

41:10That means your server is free and the same server machine can serve more clients at the same time. Make sense? Alright.

41:22So now that we know…we are aware of this one, the next one, question comes up is…

41:32…What should you draw with the client-side graphics?

41:34It depends on the focus of your application. Alright.

41:37If your application's, application focus is the parcel layer, yeah, you may draw the parcels as graphics. Okay.

41:46And the last case, in the last example pursuant to Passage 2011, the…the route, the location of those blog posting on the pictures…

41:55…was their focus, so they actually drew them with the client-side graphics.

42:00Often we actually show the query result or the geoprocessing result as client-side graphics.

42:07A typical example is that when I click on a map on a feature and I want to identify it, and I highlight that one…

42:14…those are client-side graphics. Alright. In the previous case, that…

42:20…the grab that we, that was displayed in the lower right corner, lower left corner…

42:24…that was client-side graphics, too, and that's what it was, you're location aware.

42:29Web editing, of course, is a no-brainer because you need to, in order to edit it…

42:33…you need to get hold of the geometry. You cannot just draw it on…draw the pixel of the image, right? So you need that.

42:42The last thing on my slide, but not the least one, is the client-side thematic mapping. What it is…

42:49I'll just go to another website that actually demonstrates that example very well.

42:53This is National Center of Education Statistics. By default, this application shows the African population…

43:01…African population at, below the age of 18 of, for, per school district for the state of Virginia.

43:10The nice thing about this one, it allows me to change it. Like, if I want to know the per capita income for each school district…

43:17…from 2000 census, I can do that, too. I can click on it; it refreshes the map right away.

43:22If I don't like the color or the number of classes or the class breaks, all, we are familiar with, ArcGIS Desktop, we can do that.

43:30We can click on it, raise the number, I choose the natural breaks are equal interval, or change the color to something else.

43:37It draws it right away; it doesn't have to wait, even. Alright.

43:40Another cool thing about that one, they have advanced options, where it shows that, right here…

43:46…it actually shows the histogram for each class, and it allows you to…custom…customize the breakpoints.

43:54As you see that, as I…and I move this little box here, it changes the number as a percentage.

43:59So how does it do that? [unintelligible] can do that.

44:04That much interactivity is because this is client-side graphics…

44:09…the application is our fullest spectrum of this dataset because it's holding onto that client.

44:15So it is, it can do the computation very, very fast. It doesn't have to send anything to the server.

44:23The last one in this example is that it also allows you to add another state, right.

44:29In this case, I will just add West Virginia, and it will draw the West…

44:33…school districts from West Virginia with the same values that I chose before.

44:37So this is another good example of the, the second [unintelligible] that I mentioned earlier, that on-demand case? This is what it is.

44:45So you pull the geometry when you need it. You don't want to draw all those, like, I don't know…

44:51…50 million school districts, maybe, in the United States at once. That will slow you down. Alright.

44:57So now that we, we know what it is and how exciting the client-side graphic is, how awesome and cool it is…

45:04…you maybe say, Okay, I need to go back to my office and start working on it.

45:08But I would say, hold onto that part for just next couple of slides. That's because, two things.

45:15One is that, as I have been saying that client-side graphics requires you to download the geometry, right.

45:21The bigger the response is, the slower it will…the much time it will take to download that information.

45:28Number two, it holds that information too on the client side.

45:31That is, the more information you put it on the client memory, it may make your browser behave very slow.

45:38So…and I'm pretty sure you don't really want that to happen to your map, or your application, alright.

45:45So, but, now that…there is a question now comes up is that, when would you use the client-side graphics versus the other two approaches…

45:56…alright, because of those two issues. And the bad news is, there is no such line. You have to test it out.

46:03The good news is that we have been putting some blog posts out in recent few weeks…

46:08…and that will help you out to test and find out what is the line for you, for your test application. Right.

46:15And we have a couple of blog posts that will help, that will help you to work with large dataset…

46:21…the feature layer, and it'll explain what is vector tiling, which is a new one that's on-demand case.

46:27It pulls that information on demand for you. You don't have to click anything.

46:31How you'll generalize the geometry to make your response smaller.

46:35And the number one on my list is how to you determine the number of clients…

46:38…the number of features you can draw on the client application.

46:41Speaking of that, I will take you back to that, that blog post. I will highly recommend you to read through this blog post.

46:48And they have good two samples. One is this one that allows you to actually draw client-side graphics…

46:55…and see whether it will [unintelligible] up, and what is the limit where it will eventually start slowing you down.

47:02Let us start by adding only 100 circles with simple symbols. Click on it. See? It performs really good.

47:10On the right side, I see that it takes about 100 milliseconds. Pretty good, right?

47:15What if I add, for example, a thousand circles?

47:22Okay, it's not that bad, half a second, right? I'll clear it out and I'll add, like, 2,000.

47:31It is slow now. Takes about a second and half. Pretty slow, right?

47:39So it's not about the number of features you were drawing. It also depends on the symbol you are choosing.

47:47Right, with a simple symbol, it may draw okay, but the moment you actually switch it to picture symbol…

47:52…or a very complex symbol, it may slow you down within a small number of graphics. All the labeling, too.

48:00Also, keep in mind that it also depends on the feature type. As we all know that points is points…

48:09…is there is one coordinate, single coordinate attached to one point, but when it comes to a line or polygon…

48:15…by nature, we all know, it made of many, many, many, many points, right.

48:20You were lucky if there was one feature that counts as only two points, alright.

48:25Speaking of that one, I'll take you to another example that will let you, allow you to download the polygon features on demand...

48:33...and see when you hit that limit.

48:37In this next case, I will download the first 10 [unintelligible] counties of the United States.

48:41These happen to be the first 10 in that database, by the way, alright.

48:45So that drew really fast, right? No problem.

48:49And you see that it is on the lower left corner, there is something called Max Allowable Offset, that is check box, that is checked on.

48:55And what it does, it actually tries to generalize your geometry.

48:59What would happen if I, if I don't have this thing checked, right?

49:02To do that, I will use another software called Fiddler.

49:06Fiddler is a downloadable software, free downloadable software that allows you, again, to monitor your network traffic.

49:13So I'll start capturing the data. I will go back to my side.

49:17This time I'll check it, and I'll say, okay, draw the same number of features this time but don't generalize the geometry.

49:26And it's thinking and thinking and thinking, right.

49:31I did the same mistake before in the last presentation. I have chosen a number only 5 polygons, alright, instead of 10.

49:38Okay. No music? Can anyone sing? Yeah. I'm horrible when it comes to singing. Anyway. [unintelligible]

49:46So let me go back to Fiddler and see how long it took.

49:49So I'll click on that request, and I see it took about 18 seconds to download that one, right.

49:57And one thing I usually forget about this one when I'm delivering my software in house is that my server box and my machine…

50:05…live in the same network if not on the same box.

50:07So the speed is not a problem at all, but what if your client or customer lives somewhere…

50:13… and they're not lucky enough to have a decent Internet connection, like as you do, right?

50:19So this, Fiddler actually helps you to find out or guesstimate how much time it might take.

50:25So for example, if your client has just happened to be in Japan or not…

50:29…Europe with a decent DSL line, it may take about, what is that, 168 seconds, which is two and a half minutes.

50:36Your clients don't want to wait that long. They'll just bail out and never come back to your site, right?

50:43So good. Now next thing is...I mentioned something called Max Allowable what, right?

50:52And so this is called, this is a geeky way to tell the server...

50:58...we all love the geeky things here, back in Redlands, by the way...

51:02...tell that, the server, hey, server, please weed out some of the vertices from that feature, but try to preserve that shape.

51:11So in that screen shot below, I have, I have two examples side by side, showing the same number of states.

51:18They look, at that scale, they look identical. With your bare eyes, you cannot see any difference.

51:23But see them sized at the response size? On the right side, I see it took about...

51:28…is that, what, like 300 kilobyte? On the left, with Max Allowable Offset set, it's about one-fifth of the size than previous.

51:37So it takes much less time to download. So what happens behind the scene?

51:41If you at that same scale, if you zoom in without changing the Max Allowable Offset, it actually tries to generalize it.

51:47That's where you see some gaps and some overlaps. Alright.

51:50So choose that Max Allowable Offset very carefully. You can choose them or you can set...

51:58...reset them as you zoom in or zoom out.

51:59Alright, so as you zoom in, you may only, you may...you can ask for more geometry points to come in, but it will actually, what you call...

52:08...since there is less geometry points coming in, it's okay to do that.

52:13Now for some performance tips, we talked about the generalization geometry, but don’t do that while editing scenario.

52:19The editing scenario, you don’t want that overlap or gaps to be there in your database.

52:24Don’t try to download too many features at once.

52:27Beware of the number of features you download, and there’s a limit on the server side.

52:32It’s a thousand, but you can increase that.

52:34Another one is the firewall, Fiddler…filter. Sorry about that.

52:43With a feature layer, if you don’t have any [unintelligible] by default, it pulls that 1 equals 1…

52:47…and some of the, what do you call, firewalls block that, so beware of that one when you publish your map service to a public network.

52:57Where you can learn this information, of course, you can talk to us.

53:00There are…we have a couple of sessions going on all over the week.

53:05You can learn them from there or you can visit arcgis.com Resources Center.

53:09And we have examples, API references, samples, everything.

53:14Some general performance tips of the map service…

53:17…Sterling mentioned all of those - caching, annotation, performance better than geometry join…

53:23…projection is the number on [unintelligible].

53:25Make sure the spatial index is updated; it's just a recap.

53:28Data access tips. If you happen to have SDE, make sure it's well-tuned, it's compressed, statistics updated…

53:30…if you happen to have versions, make sure you have a good workflow to deal with version.

53:37Use direct connect if possible and not application server connection.

53:45When it comes to local data, try to put your local data on the same box where your server is running.

53:50Avoid using [unintelligible].

53:52If you have to use it, you may get a little more performance using the map drive rather than the [unintelligible].

53:58But you're always highly recommended to put your data on the same machine.

54:03Try to cache [unintelligible] your tool results.

54:05Speaking of that one, I will take you back to the Boston Solar example that Sterling showed before.

54:13So I will zoom in to Charlestown. I'll zoom in as I see…

54:20…okay, see some of those buildings there.

54:22And the cool thing about this one, it actually allows you to click on a building and shows a graph…

54:29…which shows the solar radiation potential for each building for each month over the year.

54:36And as I click on another building, it shows up right away. Right. It's very fast.

54:41But what if I choose an arbitrary polygon, and it will take horrible, horrible long time.

54:47Why is this happening?

54:49That's because those people in Boston, they're really smart enough. They knew their client does not want to wait.

54:56So they ran the geoprocessing tool previously for each individual building, and those results are saved in the database…

55:06…or a different table, so when you click on it, they are actually extracting the peak competent result…

55:10…rather than trying to fire up that geoprocessing tool. See how long it takes? Right.

55:15So that's what I, I said. If possible, you know, have your geoprocessing result or query result, you know…

55:23…saved to compute it.

55:26Avoid downloading all attributes if you don't need them.

55:29Like if, in an example, if your layer has, like, millions of fields, which is not really…maybe 50…

55:36If you don’t need all of them, don’t download all of them, okay.

55:41Indexing. If your application, you see that your client will actually run the query against some of the [unintelligible] fields.

55:49For example, a parcel. You want, your client will actually search parcels using Parcel ID.

55:55Have your parcel ID field indexed.

55:57Otherwise, you will do a full scan of your table, and if you happen to have five million records in the table, it’ll take forever.

56:04Do the same, too, for joins. If you have joins, make sure the common fields, we do left and right tables or the layer and table…

56:12…are indexed. You’ll get significant performance boost.

56:15Authoring a good web map. That’s a horrible area for me, because I’m a horrible, horrible person…

56:20…when it comes to mapmaking.

56:22So what I do, I steal work from other people. Don’t tell it to anyone.

56:28So to do that, what I usually do, I go to the Resource Center at arcgis.com…

56:33…and they have tons of map templates available for each individual industry.

56:37I download one of them and start working for, with, you know, one of them and work my way up.

56:43And what I’m trying to say about that one is, okay, I’ll just show you the demo.

56:51So this is arcgis.com website. I’m sorry, I actually went further.

56:55So this is where I click. This is the first page. I click the land records, I see there’s a…

57:00… called Gallery link, I click on it, I see a bunch of, I’ll see a bunch of templates pops up in a few moments…

57:09…and there are a bunch of templates. And so many that it actually gives you a filter to filter some of them out.

57:15So I’ll just filter that’s appropriate for ArcGIS Server 10, and I see only a few of them…

57:20…and this is a tax parcel viewer that you happen to see at the Plenary Session.

57:23Click on it. It gives some information. You can try it out from here, that application…

57:29…or you can download that. So if you click on it, it gives the details about that, and you can get the download link from here, too.

57:37So what you see with that, to do that, I will just go to, I will start using Sterling’s machine…

57:42… because I don’t have 10, ArcGIS Desktop on my machine.

57:49So if you go to that side, once I have this downloaded, you’ll get some of those folders that will contain that map…

58:01…that application, so you just open that, one of the maps [unintelligible] ArcMap and they just happened to publish it.

58:08It’ll just work, but something that you really don’t want to.

58:10So you want your data to publish. There are two approaches you can take.

58:14The one that I usually do is, I use the Distributor Geodatabase toolbar.

58:19Click that Extract Data, and I follow this wizard to create a geodatabase with that same schema in it, right.

58:28I’ll just follow this one, and it’s time.

58:34One nice thing about this one is that it allows you to change the spatial reference because it comes in one spatial reference.

58:40That may not be what’s appropriate for your data, so you’re allowed to change that spatial reference.

58:47You can do that. Click Next, and the last option will allow you actually, allow you to save an MXD as a new MXD…

58:55…and it will change that data source and point to that new database rather than pointing to this existing database.

59:00And after that, you can download your data to that database, and you can just start working on it and publish it…

59:07…and you know, run the same application that you saw before, it will work right away. No problem.

59:12So that is one advantage that you will get out of it, is that you get…you get your data to a standard data format…

59:18…and especially in the land records area or local government area, all the templates are based on the same data model.

59:25So if you just happened, in the couple of months, lately you happened to download some of the templates…

59:28…your, you don’t have to go to the same process. It will just work because you have a data standard, right.

59:35There’s…the down side of this one is that you, your database, you need to modify your data…data model, right?

59:43In case you don’t like that, what you can do, you can create a new data frame.

59:49That one, you bring your dataset, for example, I’ll just happen to use the same dataset, but in your case…

59:53…you will bring your dataset, go to that Symbology tab on the layer properties of that layer…

59:59…click Import, and choose one of the ones from the existing data frame.

1:00:04So what, it actually helps me, at least, I don’t have to think about those…oh, it didn’t work? Maybe it doesn’t have anything. Oh.

1:00:22Oh, well. I will pick a good one next time, next time. Sorry about that.

1:00:26But what helps me is that…that I don’t have to think about the symbols. I can use the, all the…

1:00:31…all the standard symbols that the Esri people actually thought about that will nicely blend with your application.

1:00:37You can do that, right? So with that, I’ll get back to my slides here. And, oh, the demo; we already talked about the demo.

1:00:47There are some cases where you may not find your templates, right, or the templates that you may have, might found…

1:00:53…is not good for you, so you may need to develop from the scratch. So again…

1:00:58…we always recommend you to actually take a look at those templates that's available on resources.arcgis.com.

1:01:07That’s because you can learn about how the data was structured, how the layers are structured in ArcMap…

1:01:13…the group layers’ visibility and everything, okay, so keep that in mind.

1:01:17And then you can just work…up your way to create a nice basemap.

1:01:23Next, to the feature service, those of you don’t know a feature service, it’s not really a different feature service.

1:01:28It’s an extension of a map service which allows web editing, and that’s…

1:01:34Since it is being drawn on the client side, using the client-side rendering engine…

1:01:38…there is some limitation you need to consider when you are making a map of, targeting the web editing that…

1:01:47…if you happen to have simple symbols, that works fine.

1:01:50If you have picture field symbols or marker symbols, it works fine, it comes good, nice.

1:01:55But if you happen to have a cartographic line symbol…

1:01:57…it gets downloaded to simple, line symbol because the client server is not smart enough or they are not capable of showing…

1:02:06…all the nice cartographic symbols that we can show in the desktop. Just keep it in mind.

1:02:12Some of the cases, like, for example, if you are character markup symbols or multilayer symbols, especially the marker symbols…

1:02:19…they are converted into image, so you do, most of the case, it will come out fine, but just test it out, right?

1:02:26Try to avoid gradient fields, too. And the next one is the mobile application. This is a completely different one.

1:02:32It’s targeting to a completely different thing. So far, we have been focusing on targeting a desktop application…

1:02:38…or the target laptop application where the monitor is big, versus your smartphone or the mobile devices, where the screen is small, right?

1:02:47So is there, raise your hand if any of you actually took your mobile application and tried to see arcgis.com…

1:02:54…or Google map out in full sun. Did anyone try it? Okay. Don’t tell anyone. I never tried that myself, too.

1:03:02But I trust Tom Brenneman more, you know, than myself when he is doing it, when it comes to this area…

1:03:10…and he told me, no, you cannot build, you cannot see anything, alright.

1:03:14That’s because the contrast on everything is actually, makes this pretty much invisible.

1:03:19So keep it in mind. Have your maps very - I know. Have some meaningful symbols. Have it set to contrast.

1:03:26Take away, take out some of the layers that you really don’t need them. Then, what I mentioned before…

1:03:31…is the screen size. If you happen to have a label that’s pretty big, nice looking, looks pretty good on desktop…

1:03:38…it may not even fit on that small screen, right.

1:03:42And with that, there is one little application that I will just demo before we end, is that…

1:03:49…we talked about this client-side thematic mapping before.

1:03:53Now we saw the little performance issue, right, that you cannot download all those features at one point.

1:03:59For example, if you happen to have, if you want to draw all the layers, all the counties at one time…

1:04:06…there are like 3,000 counties, if you want to draw them with the client-side thematic mapping function…

1:04:12…it will not work, simply not work, right? So you need to take advantage on the server side.

1:04:17So there is a hope that at 10.1, we are going to support that. At 10, you can still do that, but that requires…

1:04:24…significant objects programming, right, and it does not scale well, that. So, speaking of that one, I’ll take you to that example.

1:04:36So this is the map that I publish on my machine, and it, by default, it doesn’t show anything.

1:04:41You saw the similar demo at the plenary. So it doesn’t do anything, but it allows me to change the symbol.

1:04:49If I want to see the population from 2000, I can see that right away.

1:04:52I can change the class breaks, I can change the way I want it to classify, or even the color, right.

1:05:01So how it is doing it? Let’s open Firebug again.

1:05:06So there’s two steps. First is, I’ll choose, and the field that I want to be used to draw.

1:05:16Then I’ll choose the classification method; in that case, I can choose National Grid.

1:05:18I’ll do that. Okay, I want it to be grouped in five classes, and this is the ramp I would like to use.

1:05:23And then I say, generate…oh, I’ll just clear it up. Generate the classes. So it goes out to the server and asks…

1:05:30…hey, server, do that computation for me. Find the class breaks and give me a renderer.

1:05:36Once you do that, you can apply it. And there goes another request, alright, and this request actually brings that image back.

1:05:45You see that image? Alright.

1:05:47So, at 10.1, we’re not only giving you this function…

1:05:51…we’re also giving you the helper function that allows you to come up with those breaks.

1:05:54Otherwise, you’d have to write, like, hundreds of lines and implement that logic on the client side to come up with those breaks.

1:06:02Make sense? Alright, with that, I will hand it back to Sterling to review it.

1:06:09Oh! Thank you.

1:06:19We’re just about at the end. Just to review what we covered, we showed you how to plan your map for the web, right?

1:06:26You’ll take your desktop map and maybe do some whiteboarding or planning of how you’re going to break up your layers…

1:06:30…into basemaps, and then maybe take some of your layers and put them in another map document showing operational layers.

1:06:37From there on, you’ll choose what techniques you’ll use to serve out your map.

1:06:40You can either use cache tiles, a dynamically drawn map service, or the client-side graphics to provide some interactivity.

1:06:48And then you’ll follow the performance tips that we gave. The main thing to remember is precompute where possible…

1:06:54…whether it’s creating annotation, running your model on all of your features and saving those results…

1:06:59…or creating a map cache.

1:07:03We invite you down to the showcase to visit with us some more about this.

1:07:06Both of us are in the, under the web area of the showcase.

1:07:11And especially if you want to learn about the client-side graphics, how to use those in a web map…

1:07:14…and how to use that Max Allowable Offset property on the feature layer.

1:07:19We recommend these web API sessions for JavaScript, Flex, or Silverlight, whichever one you’re more inclined to.

Copyright 2014 Esri
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Best Practices for Designing Effective Map Services

Sterling Quinn and Tanu Hoque show how to optimize the design and performance of a map for online use and publish it to ArcGIS for Server.

 

  • Recorded: Jul 12th, 2011
  • Runtime: 1:07:27
  • Views: 81944
  • Published: Sep 6th, 2011
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