To be able to create a landslide inventory, you need to load and view remote sensing imagery. Landsat is free through the USGS, so we will be using this to make our landslide inventory. We will be creating stacked files with individual bands. Details on how to download Landsat imagery can be found in Chapter 6.
To load Landsat data:
44.Select Merge. This opens a Merge window.
45.Click Select… (next to Input files) to open a Select files to merge window
46.Navigate to Inventory
48.Select LC80980642014088LGN00 to select the files (by holding ctrl down while selecting them)
49.Select Open on the Select files to merge window.
75.Navigate to the Training/Inventory/Landsat/LC80980642014088LGN00 folder and name it LC80980642014088LGN00_NDVI.tif
An example of the Raster Calculator window for this example is shown in Figure 7..
Figure 7. Example Raster Calculator window showing raster calculator expression
77.A new file named LC80980642014088LGN00_NDVI.tif will appear in the Layers window.
78.Repeat this for the rest of the Landsat imagery in the Training/Inventory/Landsat folder.
Darker areas of this file show areas with lower NDVI values. Landslide areas will be medium grey (values between 0.1 and 0.5), while water and clouds (see the cloud shapes scattered across the image) appear dark grey and medium-dark grey respectively (Figure 7.).
Figure 7. Landsat image configured by raster calculator for NDVI values.