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Will using real-time corrections (such as WAAS and CDGPS) improve the orthometric (mean-sea-level) heights produced by my GPS?

April 26, 2017corrections GPS heights mean-sea-level orthometric produced real-time WAAS

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Will using real-time corrections (such as WAAS and CDGPS) improve the orthometric (mean-sea-level) heights produced by my GPS?

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Realtime corrections will improve your ellipsoid heights however the receiver’s geoid heights will still be erroneous. Furthermore using NAD83(CSRS) real-time corrections introduces a vertical datum error that must be considered. GPS receivers are designed to operate in WGS84 and the on-board geoid heights table is always in WGS84 (i.e. applies the separation between the geoid and the WGS84 ellipsoid). When using uncorrected GPS or WAAS-corrected GPS, the receiver computes WGS84 ellipsoid heights (h), applies WGS84 geoid heights (N) and produces orthometric heights (H = h – N).