topic Project Z-Coordinates in ArcObjects SDK Questions

Project Z-Coordinates

ThomasGocke — Mon, 11 Apr 2011 14:36:20 GMT

Hi,

if I want to project a point from one SpatialReference to another SpatialReference with a different datum (using GeoTransforamtion), the Z-Coordinate should be changed.
At IGeometry.Project(...) it is mentioned that "The Z and measure values are not changed by the Project method."
But the IGeometry2.ProjectEx(...) doesn't work either. Is there any way other to project Geometries that I'm not aware of?

Thanks

Re: Project Z-Coordinates

MelitaKennedy — Mon, 11 Apr 2011 23:41:41 GMT

Hi,

if I want to project a point from one SpatialReference to another SpatialReference with a different datum (using GeoTransforamtion), the Z-Coordinate should be changed.
At IGeometry.Project(...) it is mentioned that "The Z and measure values are not changed by the Project method."
But the IGeometry2.ProjectEx(...) doesn't work either. Is there any way other to project Geometries that I'm not aware of?

Thanks

Hello Thomas,

We aren't yet doing any vertical (z) transformations, even when the input/output z values represent ellipsoid-based heights. We do plan to add this functionality, but it will be in a future release.

Melita

Re: Project Z-Coordinates

ThomasGocke — Tue, 12 Apr 2011 06:33:49 GMT

Ok, thank you Melita