Is the elevation of the relative DEM relative to the ellipsoid? -

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Last Post 21 Aug 2012 03:10 AM by anon

Is the elevation of the relative DEM relative to the ellipsoid?

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anon

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21 Aug 2012 03:10 AM
Hi, I used the DEM Extraction Modules to extract a DEM from the ASTER L1A data without GCPs, that is a relative DEM. Is the elevation of the DEM relative to the WGS-84 ellipsoid? And if so, how could I convert the elevation to the height relative to EGM96 geoid? Thank you very much. Yuzhe

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21 Aug 2012 12:59 PM
A relative DEM is one with possible differences in position, scale, and rotation from the geodetic coordinates on the ground (horizontal reference system) and the mean sea level (vertical reference system). You could use the 'world_geoid_height_EGM96.img' file located in the ENVI 'data'directory.

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21 Aug 2012 08:31 PM
Thank you very much. I have completed the conversion successfully as you said.

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