Regional gravity studies of western and central Montana



During the summer and fall of 1963 a U.S. Air Force geodetic survey team of the 1381st (now the 1st) Geodetic Survey Squadron, under the supervision and direction of the author, conducted a regional gravity survey in western and central Montana. This survey established 2700 gravity stations and an associated base station network in the general area outlined from 106°W to 115°W and from 45°N to 49°N. The principal objectives of this work were to determine the feasibility of using combined geodetic and gravity data to evaluate gravimetric interpolation of astro-geodetic deflections of the vertical and to determine the accuracy of astronomical positions corrected for gravimetrically interpolated astro-geodetic deflections of the vertical [Anthony, 1964]. The data were later released to the author for geological interpretation.