I'm trying calculate volume change between two grids, but am not getting the results I'd expect... The data I'm working with is linear (metres) in x,y,z, and I'm gridding it within Surfer 12 - am I getting odd values because Surfer is interpreting the x and y as decimal degrees? And if so, is there any way to rectify this? My data isn't scalable to a coordinate system (total area of 0.14m2), so it needs to remain linear.
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