I have two precipitation rasters, each with a different raster cell size 4.1 x 4.1 km, 4.6 x 4.6 km). The two rasters have the same geographic coordinate system, but different projections. I would like to subtract one raster from the other to calculate and map the difference. My understanding is that two rasters must be orthogonal (same resolution and same grid centers) and concurrent (same extent) in order to perform this subtraction procedure. Subtraction can be accomplished using spatial analyst in arcmap. However, my question is...can I use raster calculator with the two rasters 'as-is' and let arcmap take care of orthogonality and concurrency issues, or do I need to do pre-processing steps such as alignment and resampling on one of my rasters? If so, what specific pre-processing steps are required?
It appears from (What will happen if we subtract two raster with different cell size using Raster Calculator?) that arcmap will automatically re-sample the smaller raster according to environment settings. But it is not clear to me if this just addresses cell size, or if it also addresses other aspects of orthogonality and concurrency. In order to have full control, what pre-processing steps are needed? Thanks in advance.
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It appears from (What will happen if we subtract two raster with different cell size using Raster Calculator?) that arcmap will automatically re-sample the smaller raster according to environment settings. But it is not clear to me if this just addresses cell size, or if it also addresses other aspects of orthogonality and concurrency. In order to have full control, what pre-processing steps are needed? Thanks in advance.
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