00:01In this first exercise, we’re going to get to know the Los Angeles River and its surrounding area.
00:06At the same time, we’ll learn a little bit about the basics of working with ArcMap...
00:10...how to navigate a map, how to add and symbolize data...
00:12...and how to get some information about the map features.
00:17We’ll start with a blank map document...
00:22...and add a basemap from the Add Basemap command.
00:26Pick the one called Streets, click Add.
00:29Click yes to enable Hardware Acceleration.
00:32Now grab the Zoom In tool and drag a window around the west coast of the United States...
00:38...and down into the Southern California region around Los Angeles.
00:46Keep zooming in...
00:47...until you can easily distinguish cities, freeways, and landmarks like parks and airports.
00:56Now let’s add some project data on top of our basemap.
00:59Click the Add Data command.
01:00The first thing we have to do is connect to a folder.
01:05Expand the directory down to the UGIS folder that was added when you installed the data.
01:15Now go in and expand the ParkSite folder, SourceData, double-click the ESRI.gdb...
01:23...double-click Boundary, and add the City_ply feature class.
01:28A layer of city boundaries gets added to the map.
01:31Go to the table of contents and toggle that layer on and off a few times.
01:36Click on the layer symbol and change it to whatever color you’d like.
01:42The name is somewhat cryptic, City_ply, so let’s go ahead and right-click the layer name...
01:49...go to Properties, and we’ll change the layer name to Cities...
01:53...which is a little bit more descriptive.
01:59Click the Source tab.
02:00You can see some technical information about where the layer is stored.
02:03One of the key things about a GIS database is that all of the geographic features...
02:07...actually have attribute information behind them.
02:10So if we use the Identify tool...
02:12...we can go in and click on any feature...
02:14...in this case, Santa Monica, see some descriptive information about it...
02:18...and we see information about households, population, square miles, that kind of thing.
02:23Another way to get information...
02:25...is to actually open the attribute table for the entire feature class.
02:29So we go to the layer, right-click, say Open Attribute Table.
02:34Now we see an attribute table for every feature.
02:37Down at the bottom of the table, we can see that this feature class contains 25,374 records.
02:45These are actually all of the incorporated cities in the United States.
02:49We can expand the table by dragging it out to the left and the right.
02:58As you play with the table and drag it around...
03:00...you’ll see the different anchor points that are available.
03:03These are different places where you can dock the window on the top or bottom...
03:07...or the left and right of the application window.
03:12If you right-click Cities, and click Zoom To Layer...
03:15...the map zooms all the way out to the entire United States, including Alaska and Hawaii...
03:20...because this feature class includes cities in all 50 US states.
03:24If you move the window out of the way, you can see the entire extent cover.
03:29Click the Return To Previous Extent button to get right back to where we were.
03:34Now, rather than sorting through all 25,000 records to find the city of Los Angeles...
03:39...we’ll use the Population Value, Sort Descending...
03:43...and then Los Angeles comes up second on the list behind New York.
03:46Click on the left square box to highlight the record.
03:51Close the attribute table.
03:55Right-click the layer...
03:57...go to Selection...
03:59...Zoom To Selected Features.
04:01Now we’re centered and zoomed in to the city of Los Angeles proper.
04:05We can clear the selection with the Clear Selected Features button.
04:08Now we’ll go back to the Layers menu.
04:10Right-click, go to Properties.
04:12We’re going to build a definition query, which is going to show us only the city of Los Angeles.
04:18In the Query Builder, click "Name" =...
04:22...click Get Unique Values, which will populate a list of all the values in this table.
04:27Locate the one that says 'Los Angeles'...
04:31...double-click it to finish building the expression, verify it, click OK.
04:42What we’ve done with the definition query...
04:44...is to filter down our feature class down to a single record.
04:47If we open the attribute table, we can see that single record for Los Angeles now.
04:52Close the attribute table.
04:55Now we’ll go ahead and add some more data.
04:57Click the Add Data button...
05:00...navigate up one level to the Hydro feature dataset, and click the River feature class.
05:07This is a layer of hydrology for the county of Los Angeles.
05:11Click the Identify tool and begin exploring this dataset.
05:15The one that we’re looking for is called the Los Angeles River, and there it is right there.
05:20There’s the first instance of it.
05:26There are different segments of it in this database, and there’s another one.
05:30The river runs east to west across the city, then turns south near the eastern edge...
05:34...and follows the 710 freeway down to San Pedro Bay.
05:38But because this is the only feature in this layer that we’re interested in...
05:42...we can use the definition query again to filter it down to just the Los Angeles River.
05:48So just like we did for the Cities, we’ll do the same thing for the Los Angeles River.
05:54So we click "Name" = 'Los Angeles River', that’s our complete query.
06:00Now before we apply it, we’ll go over to Symbology...
06:04...and we’re just going to increase the thickness of this feature...
06:07...to make it a little bit more prominent on the map.
06:09Bring it up to 3-point width.
06:15And one last thing, we’ll go back to the General tab.
06:17We can see some descriptive information about the layer...
06:20...and we can change the layer name to Los Angeles River.
06:27Now open the attribute table for the Los Angeles River feature class.
06:32We’re going to use the values in the DESCRIPTION column...
06:35...to show you by example how you can select by attribute.
06:42So open the Select by Attributes table, click "Description" = 'Perennial'.
06:52And now we can see a way that we can select records based on their values within the field...
06:58...just like we did with the definition query...
07:01...only now we’re using it as a means of making a selection.
07:09We’ll save our document by clicking the Save button and navigating into the UGIS folder...
07:16...under ParkSite in the MapsAndMore folder.
07:20We’ll call this first map document Lesson1.
07:26Now we’ll go ahead and add another basemap.
07:28This one’s going to be an imagery basemap.
07:31Click Imagery, and Add.
07:35Now, both these basemaps are called Basemap, which is a little bit confusing...
07:38...so we’ll go into the properties of each one and rename them something more logical.
07:43The first one that we just added we’ll call Imagery Basemap.
07:51Then we’ll go into the Streets basemap that we added previously...
07:54...and rename that one to be called Streets Basemap.
08:00Turn off the Streets Basemap, and turn on the Boundaries and Places...
08:06...and the Transportation layer.
08:08Under the Imagery Basemap, we actually have three sublayers, Boundaries and Places...
08:12...Transportation, and the original Imagery layer itself.
08:15We want to create what’s called a map sandwich by dragging the Cities layer...
08:19...down underneath the Boundaries and Places and the Transportation layer...
08:22...and above the Imagery layer.
08:24Now our map is showing a little more context.
08:27Let’s create a bookmark.
08:30Call this bookmark City of Los Angeles.
08:34This way, we’ll be able to get back to this point whenever we need to.
08:37Now we’ll grab the Zoom In tool and go down to the far southern point of the LA River...
08:41...where it dumps into the San Pedro Bay.
08:44Set the scale at 1:10,000.
08:46Actually, down in this part of the bay it’s known as Queensway Bay...
08:49...and the reason is that the Queen Mary ship is docked down here.
08:53Use the Pan tool to kind of zoom around in this area, take a look around...
08:57...it’s a very interesting part of the city of Los Angeles.
09:00You can use the Fixed Zoom In and Fixed Zoom Out tools to get around.
09:04There’s the Queen Mary.
09:07Keep zooming in.
09:09You can see this is very high-resolution imagery...
09:12...but even the imagery will have a limit...
09:14...at some point as to how far we can go, and there it was.
09:19But we have a bookmark, so we can easily get back to where we want to be.
09:23We’ll drag our Cities layer back up above the Imagery basemap.
09:27We’ll open the Properties for the Cities layer.
09:31Click the Symbology tab, and open the symbol.
09:35Let’s change the fill color to blank, or no fill color.
09:42We’ll increase the outline width to 2 and change the outline color to a bright yellow.
09:53Under the General tab, we will change the layer name to Los Angeles.
10:01Now we have a nice yellow, easy-to-see outline of the city of Los Angeles.
10:06We’re going to create a layer file for this particular layer that we can use later.
10:10In the table of contents, we’ll right-click the layer...
10:13...and save it as a layer file called Los Angeles.lyr.
10:18Just to show you what’s going on now, we’ll remove the original layer...
10:22...and we’ll go in and add our layer file that we just created.
10:33The layer file stores all the properties of the layer, its name, symbology...
10:37...the definition query, everything, including the path to the layer’s source dataset.
10:43So basically, what happens is the layer is added in with all its symbology...
10:46...and everything already set up.
10:48We’re going to use this layer later on in the book.
10:51Now we’re going to go in and explore the entire length of the LA River on top of the imagery...
10:56...just to get a visual sense of what kind of landscape we’re dealing with here.
11:01We’ll pull the scale down to 1:24,000, go up and grab the Pan tool...
11:06...and then just start manually panning to the east along the length of the river.
11:12This upper portion cuts through a fairly densely populated area up in the San Fernando Valley.
11:17You can see there are some parks and open space and some golf courses along the length.
11:27As we continue to the east...
11:30...pass through the area around Forest Lawn Cemetery, Universal Studios.
11:38Now we’re heading south...
11:54...coming up to the Dodger Stadium area, the LA Police Academy, there's Dodger Stadium.
12:02Go ahead and create a bookmark at the Dodger Stadium area.
12:13And in our Bookmarks Manager, we can actually save the entire set of bookmarks.
12:18We’ll save these into our MapsAndMore folder, and we’re going to call these Lesson 1 Places.
12:24So now we have two bookmarks and one Bookmarks folder.
12:29Now we’re continuing south, scrolling along through the downtown area...
12:35...and we come to the border of the city of Los Angeles.
12:39Now we’ll exit the map.
Exercise 1a: Explore the study area
Understanding GIS: An ArcGIS Project Workbook for ArcGIS 10
Lesson 1: Frame the problem and explore the study area - Frame the problem and explore the geography of the study area.
This video was produced for the first edition of Understanding GIS: An ArcGIS Project Workbook. Users of the second edition may notice small differences in workflows and results. Book resources are located on ArcGIS for Professionals.
- Recorded: Nov 1st, 2011
- Runtime: 12:50
- Views: 17231
- Published: Mar 9th, 2012
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