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Calculate Elevation/Slope Stats

ElkeElke Global Mapper UserPosts: 3
edited December 2014 in Elevation Data
I created a grid file displaying an isopach map of andosol thickness on which I imported surface features (drainage areas). I want to use the calculate elevation/slope stats to obtain the average andosol thickness in a specific drainage surface. I used 0.1m as a minimum elevation value for the isopach map and I replaced Invalid with 0m, but still if the drainage area is covered by a large part below 0.1m, it considers it as 0.1m and not 0m. Therefore, my averages thicknesses are overestimated. How can I solve this?
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