Accession Number : AD0787474

Title :   An Empirical Method for the Determination of Gravity Terrain Corrections,

Corporate Author : DEFENSE MAPPING AGENCY AEROSPACE CENTER ST LOUIS AIR FORCE STATION MO

Personal Author(s) : Voss,James T.

Report Date : JUL 1974

Pagination or Media Count : 74

Abstract : Terrain corrections are usually estimated by laborious determinations of the topographic relations around the gravity station out to distances of 22 to 160 kms on a zone and compartment basis. A systematic measuring of the maximum topographic slope and the mean relative relief out to different distances around gravity stations for which the terrain correction was known showed that a set of empirically derived curves could be established relating the terrain correction to the topographic slope and relative relief within approximately 15 kms of the station. Mathematical definition of this set of curves in accomplished through the use of a simplified solid geometrical model (a cone) to define the terrain effect around the gravity station. The equation for this model is used to determine terrain correction values for a sample of 254 gravity stations in the Sierra Nevada Mountain area. (Modified author abstract)

Descriptors :   *Terrain models, *Gravity anomalies, Theses, Terrain following, Topographic maps, California

Subject Categories : Geodesy
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE