Elevation diifference Emlid Flow and Local GIS

I have the Reach R2s and using the Emlid Flow app for point collections using Point One Navigation for real-time corrections. I have been using the NE83F for the settings in Omaha, NE when collecting points. When I bring into Autocad Civil 3D and compare existing grades in the GIS map to the grades that I have collected they are about 92-93 feet difference. I know it has to be a setting that I do not have correct yet. Any suggestions?

Looks like the geoid offset in Nebraska is approx. 27m (89’) above ellipsoid. That might be a place to check first.



Hi Jeff,

I agree with Dave. Please ensure the same vertical datum is used for the known and collected points. If you need any further help with it, let us know!


This topic was automatically closed 100 days after the last reply. New replies are no longer allowed.