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I am not specialized in GIS.

I have some moisture contour maps, I want to compare each pair to trace the changes between either in a numeric way. I tried to get the mathematical difference between the corresponding values of each pair of maps and to calculate the ratio between volumes (Area * moisture content as a third dimension).

Are their more scientific methods to perform such comparisons?

I searched for "comparing terrain volumes" but it leads to nothing.

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    The easiest way is interpolating them to rasters of the same extent and cell size. Raster calculator (difference) will do the rest. If ArcGis is an option, I suggest using topo to raster tool for interpolation, it's the best when dealing with contours. – FelixIP Feb 11 '18 at 8:56
  • Many thanks @FelixIP for your answer, However, I use python in my work, I do not know about the raster calculator. Can you suggest native algorithms names so that I can search for them in python, or even I can implement them myself. – Mohammad ElNesr Feb 11 '18 at 9:59
  • pro.arcgis.com/en/pro-app/tool-reference/3d-analyst/…. Won't be easy to implement and you also need to find raster format comfortable to work with. Raster calculator is easy, you perform math on the same cell from 2 or more rasters. – FelixIP Feb 11 '18 at 18:19
  • ..and store result in output raster. You'll turn to GIS sooner or later in your line of work. – FelixIP Feb 11 '18 at 18:26

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