Assertion: unit's definition | /r/HasProperty | retained for data
Facets:
Source sentences:
text: At the time of the agreement, the basic geodetic datum in North America was the North American Datum of 1927 (NAD27), which had been constructed by triangulation based on the definition of the foot in the Mendenhall Order of 1893, that is 1 foot = 1200/3937 m: this definition was retained for data derived from NAD27, but renamed the US survey foot to distinguish it from the international foot.