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Author Topic: DEM export wrong by directly changing coordinate system  (Read 3071 times)

Phogi

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DEM export wrong by directly changing coordinate system
« on: March 29, 2017, 04:03:05 AM »
Hi Alexey,

We found when exporting DEM in geoTIF generated in OSGB or any coordinate systems which are not based on GRS80, the height doesn't match with it was generated in WGS84 coordinates. For example, I generate a DEM in OSGB epsg 27700, which is based on Airy ellipsoid, and direct export, and when exporting I select the coordinate system as "WGS84", so it should transform to WGS84, and horizontally it does correctly, however, the height is shifted by about 3.8 meters.
See image attached.

This can be corrected by regenerating DEM in WGS84 coordinate system defined, and export would be correct. Would it be a bug or it is not suggested to export in different coordinate system in Agisoft?

Thanks,

Cheers,