00:01Welcome, I'd like to introduce you...
00:02...to interactively enhancing imagery in ArcGIS 10.1.
00:06I have ArcMap open, and I'm just going to add some imagery that comes from an...
00:10...IKONOS-2 satellite; it was taken over Korea in April of 2006.
00:16I'm going to add the Pansharpened raster product to the display.
00:22You can see that when it's added that it's added using a natural band-color...
00:26...combination and it's already stretched.
00:30I want to zoom into this area here and look at an airport runway.
00:40What I would ideally like to do is be able to map...
00:43...the paint lines that exist on this current runway.
00:47I'm going to zoom a little bit closer in and you can see that they are visible, but there are...
00:52...things that we can do that's better.
00:54For this, I'm going to use the Image Analysis window.
01:00In this window, there's an Interactive Stretch tool so that I can adjust the histogram.
01:08I can see that when I slide these in and out, certain colors become brighter and darker.
01:15I'm going to play with this to decide which one to adjust.
01:21Currently, the stretch that's being applied is the Percent Clip, which I can see over here...
01:25...in my Image Analysis window.
01:27I'm going to adjust the Percent Clip for all of these bands.
01:34That immediately looks a little bit better; I can certainly see some of these lines right away.
01:41But what I'm concerned about is the washout in some aeras along the runways...
01:46...so I'm just going to remove the clip on this other end.
01:50And you can see that the detail is coming back.
01:53Next, I can use the sliders to maybe add a bit more contrast...
01:58...to bring out the differences between the light and dark colors.
02:04And as I'm inching it toward the right-hand side, I can see that these colors now are...
02:10...really popping out.
02:11I can also adjust the gamma to make the image slightly darker and slightly brighter.
02:19So now you can see how I can easily pick out the painted lines on this runway.
02:25And I can also see some of these orange markers in here...
02:29...that seems to line up with some of these other lines.
02:32This is just one stretch to bring out certain features.
02:35You can see that this stretches isn't ideal for the whole image, though.
02:38I'm going to go down to this other area here, where this actually -- an outlet into the water.
02:46I want to change my band combination to go from the natural-color...
02:49...band combination to a color infrared.
02:51I'm going to use the Nearinfrared band, the Red, and the Green bands.
02:58So immediately this changes that you can see now the vegetation, in this case, is red.
03:03I'm just going to zoom in a little bit further in to the area that I want to pay attention to...
03:10...and I'm going to open up my Interactive Stretch tool again.
03:18What I would like to do is be able to see the channels a little bit better.
03:23Let me just reset everything to 0.
03:25You can see immediately that some features start to show up.
03:30I'm just going to play with this to try and decide which way I should be stretching this.
03:37And that certainly does make things pop, so let me make an adjustment...
03:45...to all of these histograms, and we can see more features in there immediately.
03:49I'm going to bring this in a little bit more and maybe back out.
03:56I might even try making this a little bit brighter.
04:01So immediately, I do like this; I'm going to zoom in again a little bit further...
04:06...and see if I can enhance some of these channels with adjusting my contrast...
04:19...and playing with the gamma, maybe adjusting my brightness.
04:38Right away, you can see this whole channel that comes up and along through here...
04:44...and these are the kind of things that I want to be able to map.
04:48This is just one example of how you and I can use ArcGIS...
04:51...to help you see useful information in your imagery.
ArcGIS 10.1 New Feature: Interactive Histogram Stretch
Imagery is easier to make look good in ArcMap with the Interactive Histogram Stretch on the Image Analysis window in version 10.1.
- Recorded: Nov 2nd, 2011
- Runtime: 05:03
- Views: 1867
- Published: Nov 3rd, 2011
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