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Add Surface Information math for Surface Area

Question asked by gabriel_lousada on Oct 9, 2016
Latest reply on Oct 10, 2016 by gabriel_lousada

I was wondering if anyone knows what is the math calculation behind the Add Surface Information tool to extract the Surface Area value for a DEM in raster format. 

At first I thought it used it the slop angle and cosine rule to provide the Surface Area. But after implemented this calculation on modelbuilder I discovered that the results I was getting on modelbuilder were very different from the ones I had at Add Surface Information.


If someone have any ideas it would be great.