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hello frinds.
i need help to sure what is the acurace of elevation in static post prosacing.
if diffrance from base point is 25km.
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Hi ASIF!
You can find it in many Satellite Positioning System (GPS/GNSS) literatures that vertical accuracy is always twice the horizontal accuracy. If your GPS/GNSS sensors is capable to hit 5mm accuracy in horizontal position, then your vertical accuracy shall be 10mm.
Hope this helps.
Regards,
Arnel M. Domag
nth geographics and geometrics
To my opinion, mean sea level datum is only good if geoid model for the place you are surveying is available at your disposal. Employing the universal geoid model (EGM96) does not necessarily provide same as or similar to the local geoid model. Yes, I agree that providing vertical control using levels is good for civil engineering requirements but pardon me if I don't get the idea of providing level grade elevation values to control points eliminating curvature correction requirement. Curvature correction is a way of life in survey/mapping work in any discipline you are involved in particularly the civil engineering domain of huge area coverage.
I am pretty convinced with my Leica GS09 GNSS ellipsoidal height output values. I can get elevation accuracy of 6mm + 0.5ppm. I don't think this can be beaten easily by levels on long routes granting you are able to perform Laplace correction for the undulations to get the relationship between geoid and ellipsoid models you are employing.