The Math toolset is provided with the Spatial Analyst Toolbox and contains tools such as Minus, Divide, and Plus to perform mathematical operations on raster datasets. In some instances, running one of the Math tools on a raster dataset returns incorrect results. For example, when running the Minus tool to subtract the values of one raster from another raster, the returned results are incorrect.
This issue occurs because the rasters used as input in the Raster Math toolset have different cell sizes. To check the cell size of a raster, right-click the raster in Table Of Contents and open Properties. Then click the Source tab to view the Raster Information section where the Cell Size is shown.
Note: When running the Raster Math toolset, ensure the projection of the input rasters are the same. If necessary, use the Project Raster tool from the Data Management toolbox to change the projection of the rasters.
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