EGM96 height difference
I asked this question last year and now I was able to test this further. Equipment used is: Trimble R8 and Access, CHCNAV i90 and Landstar 7, Leica FLX100 and Zeno Mobile, Leica FLX100 and TcpGPS.
- The control points are measured with R8 and Access. Global EGM96 geoid file from Trimble was used.
- CHCNAV i90 and Landstar 7 get 25cm higher elevations at this control point using the same geoid file. Landstar 7 can use Trimble GGF files.
- FLX100 and Zeno mobile get 15cm higher elevations using a 500m grid geoid and 40cm higher elevations using 1000m grid geoid. Geoid is EGM96.
- FLX100 with TcpGPS heights match with CHCNAV i90 and Landstar 7. TcpGPS has its own version of EGM96 which is installed with the software on Android.
Is the EGM96 reliable? Why does it report such differences with different software and hardware?
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