The old standards like the North American Datum of 1983 (NAD 83) for horizontal positioning and the North American Vertical ...
If your farm machinery auto steer or GPS guidance system is tied into a local RTK or Real Time Network (RTN) corrections ...
The National Geodetic Survey (NGS) has published a technical report that describes options for how NGS can implement a time-dependent geopotential datum and thus a time-dependent geoid model. My last ...
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