I am using ArcMap 9.3.1, 3D Analyst/Surface Analyst/Area and Volume Statistics to calculate some statistics on a TIN we have for a lake. The two options for calculating statistics are “Calculate Statistics above plane” and “Calculate Statistics below plane”. It says my Z max is 14.19 and my Z factor is 1. When I enter my Height of plane as 0 and calculate the statistics above the plane it gives me these results:
And when I enter my Height of plane as 14.19 and hit calculate statistics below plane I get these results:
These numbers should be the same should they not be? am I missing something here? Any explanation would be greatly appreciated,
Thanks in advance!