Problem with Surface Difference Tool - projected coordinate system required?

Question

Hello,

I am trying to determine the volume between two TIN's using the surface difference tool. I keep getting an error message that a projected coordinate system is required, but, my project is already in a projected coordinate system (under scene layer >properties). Any help would be much appreciated. also, Is there perhaps a better way to do this? arcscene surfacedifferencetool #volumetric analysis

Thanks,

Jesse

DanPatterson_Retired · Answer

cubic feet presumably, if the units of the file were feet BUT if the units of the coordinates were in meters, and the zvalues in feet, the z-values should be converted to meters (can be done internally) since 1 ft is about 0.3048 m,  In this fashion, your volumes will be in m^3 an can then be converted to feet^3 or cubic yards

JessePine · Answer

Thank you for your help, Dan. I have my elevation values for the two TIN's converted to scene units feet to meters but the original z information I used to make my TIN's was in feet (needed to line up with my DEM).  Would it be safe to assume that the volume displayed in the attribute table for the surface difference layer would be calculated using the units of feet?

thanks again!

DanPatterson_Retired · Answer

If your file's units are meters then area would be sq m and volume, cubic meters