APPLICATION OF FIRST APPROXIMATION FORMULAE FOR THE COMPUTATION OF CHARACTERISTICS OF THE EARTH'S GRAVATIONAL FIELD,
Abstract
The methods for numerical calculation of the earth's gravitational field characteristics are considered according to Molodensky's first approximation formulas. In the cases where the mean values of gravity anomalies and G sub 1 corrections obtained for some areas can be used, it is recommended to determine the mean values of G sub 1 omitting the determination of their point values. When the radius of the averaging area is larger than 20km it is practical to use, instead of G sub 1 much smaller and more stable G' corrections (see formula 10). When free air anomalies are used, then the mean values of these corrections are close to the mean values of terrain reduction. The method is considered for the combined calculation of the mean values of delta g and G' from the data of the correlation analysis of the gravity anomalies and the heights of the earth's physical surface. It is recommended to eliminate the constant part from the anomalies when the effect of the nearest areas on the quasigeoidal heights and plumb-line is calculated. A rough evaluation of the mean values of the G sub 2 and G sub 3 corrections is made for large areas. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1966
- Accession Number
- AD0634930
Entities
People
- L. P. Pellinen
Organizations
- Aeronautical Chart and Information Center