Assertion: horizontal coordinate | /r/HasProperty | converted to nad 27 coordinates
Facets:
Source sentences:
text: If horizontal coordinates, initially obtained by a 3D measurement system as NAD 83 coordinates, are converted to NAD 27 coordinates (with their accuracy degraded), it will still be necessary to retain NAD 83 as the basis for expressing ellipsoid height, thus requiring dual datums to be used in the data bases that are maintained.