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Just an idea but you seem to be constructing your rectangle from a ring and the help talks about wrapping rings in higher level geometry. If it were me and as it looks like you are building a simple rectangle I would have built the polygon this way (not sure it makes a difference but worth a try?)... Dim pPolygon As IPolygon4 Set pPolygon = New Polygon Dim ...


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As Hornbydd said you want to use the IProximityOperator3d interface. In order to find a distance from the Earths' surface you need to get a good model of the Earth, after that it's just a return distance. There are different operators depending on how this is modeled: DEM, TIN, Terrain... when you've got that model post that as a separate question as the ...


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based on your table, the field name for the height above ground should be modified : it has to be OFFSETA . Z is not recognized as an elevation value by the tools.


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i solved the problem by converting the tow TIN to a raster before execute the cut fill 3D analyst tool :



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