COMPATIBILITY OF GEODETIC POINTS

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 2, 231-238 pp

ABSTRACT

Applicability of a geodetic point can be defined by its compatibility. A point compatibility is well described by its coordinate differences dC=C´- C using for point coordinates their official values C just as the contemporary ones C´ from new measurements. Point compatibility is acceptable and the point is usable, if dC are little
values only. The quantities C´ and dC can be determined from terrestrial or satellite measurements. To verify the point compatibilities, the surveying results for actual geodetic control are first processed in some auxiliary frames. The coordinates obtained
CL are then transformed into basic frames to values C´ using standard or robust estimation. By testing dC, the compatibility of each verified point can be confirmed or rejected. If more uncompatible points are assumed in the investigated point set, a reliable sight at the compatibility status of points can be obtained by robust estimation.

Keywords: applicability of geodetic points, coordinate discrepancies as compatibility indicators, compatibility in terrestrial and space references frames, standard and robust discrepancies, testing.