The Weighted Sum tool provides the ability to weight and combine multiple inputs to create an integrated analysis. With it multiple raster inputs, representing multiple factors, can be easily combined, incorporating weights or relative importance.
Using the tool
The steps for running the Weighted Sum tool are as follows:
- Add rasters.
Click the Input rasters arrow and click an input raster, or browse to an input raster and click Add. The raster is added to the weighted sum table. Repeat to enter the next raster, and so on.
- Select the field.
For each input raster, click the field column to specify the field to be used in the overlay analysis. A drop-down list appears displaying all valid fields for the input. The field must be a numeric field.
- Assign weights for input rasters.
Each input raster can be weighted, or assigned a percent influence, based on its importance. For each input raster, click in the weight column to specify a value. The weights can be any floating-point value (negatives included).
- Run the tool.
The cell values of each input raster are multiplied by the raster's weight. The resulting cell values are added to produce the final output raster.