Available with Image Analyst license.
Overview
Computes the differences between two categorical or continuous raster datasets.
Notes
This function can be used to enumerate the differences between two classified rasters for land cover change analysis, or it can be used to examine changes between two single-band continuous rasters such as elevation, temperature, canopy cover, and so on.
There are three computation methods:
- Difference—Calculates the simple difference between two continuous raster datasets.
Raster2 - Raster - Relative Difference—Calculates the percent difference between two continuous raster datasets.
(Raster2 - Raster)/Raster - Categorical—Identifies the changes between classes in two classified raster datasets and generates a raster layer with an attribute table containing change information. The resulting layer is classified into change classes. For example, a class labeled Forest_Developed indicates a change from Forest in Raster to Developed in Raster2.
If either input is a multiband raster, only the first band in the raster is used for computation.
If Compute Change Method is set to Categorical and one of the inputs is not categorical, a simple difference will be calculated.
Parameters
| Parameter | Description |
|---|---|
Raster | The first raster to be used in the computation. To evaluate change from time 1 (earlier) to time 2 (later), enter the time 1 raster here. |
Raster1 | The second raster to be used in the computation. To evaluate change from time 1 (earlier) to time 2 (later), enter the time 2 raster. |
Compute Change Method | The method used for computation.
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