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Ground control points (GCPs) must be photo-identifiable with a 1 meter ground sample distance (GSD). Features are selected to be accurate picked during photogrammetric processing. Possible cultural features are sidewalk intersections, road and railroad intersections, airport runways, tennis courts and other athletic fields, and the like.
Possible natural features would be large (several meter) boulders. As maintaining panels would be a continuing expense over the many years of planned operation, panels shall not be used.

2 Datum

2.1 U.S. and Canada
Both horizontal and vertical coordinates shall be measured and reported in NAD83 (see: NOAA Professional Paper NOS 2, North American Datum of 1983, Edited by C.R. Schwarz, National Geodetic Survey, NOS, NOAA, U.S. Department of Commerce, 1989).
GCPs are to be described in absolute geodetic coordinates (latitude, longitude, and ellipsoidal heights) as referenced to the GRS80 ellipsoid.