I need to calculate the volume of and have received the 'grids must be the same' size message. I have created an irregular shaped surface and subsurface grid. Due to the slope of the walls these vary in size.
The surfaces both have 'No Data' assigned.
Since Surfer needs both surfaces to be the same size and number of grid values, how can I get a calculation of only the inverted pyramid shape from the surface to the bottom of the excavation? Can I give it the surface boundary as a limit but get only the volume I require?
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