Knowledge Bank

Previous work on the general combination procedure has been extended to include datum rotation and datum scale parameters. The new equations have been incorporated into two computer programs that are described in the report. The first program incorporates satellite derived station coordinates and data from gravimetrically oriented stations to find a consistent set of datum parameters, geocentric coordinates of various stations, and an equatorial radius. This program is designed to handle a various number of unknowns. One such dimension would allow for 35 satellite derived stations, 25 astro-gravimetrically stations, and 10 datums. In the second program, potential coefficients are added as unknowns and deflections of the vertical and height anomaly information is directly input to the program. In this program, in addition to the unknowns described in the first program, a total of 330 potential coefficients or a set complete to n = 17 may be found. This latter program incorporates a set of 2592 5° mean anomalies, and yields an adjusted set of these anomalies that are consistent with the adjusted potential coefficients.