Accession Number : AD0671601

Title :   ON THE CORRELATION BETWEEN THE ACCURACY OF ANOMALY DETERMINATION AND NETWORK DENSITY IN GRAVIMETRIC SURVEYING (O ZAVISIMOSTI MEZHDU TOCHNOSTYU OPREDELENIYA ANOMALII I GUSTOTOI SETI PRI GRAVIMETRICHESKOI SEMKE),

Corporate Author : AERONAUTICAL CHART AND INFORMATION CENTER ST LOUIS MO LINGUISTIC SECTION

Personal Author(s) : Malovichko,A. K. ; Chadaev,M. S.

Report Date : FEB 1968

Pagination or Media Count : 13

Abstract : The basic indicators of gravimetric surveys, i.e. the accuracy of anomaly determination and profile spacing, are not independent. Working allowances in the 'Technical Instruction on Gravimetric Prospecting' are given depending on the scale of the map under consideration. The indicators also obviously depend on the nature of the anomaly field. The study of the correlation between the indicators is important both in projecting works and in analyzing the accuracy of accomplished surveys. Investigation based on a polynomial approximation of the anomaly diagram is discussed in this article. By expanding the function of the segment (-1,1) in a Fourier series the frequencies and amplitudes of simple harmonics depend on the order of their n. If in the expansion, consideration is limited to the N-th harmonic which has no more than 2n zeros, then the number of its values at equidistant points is equal to 2n+1, i.e. it is one unit greater than the number of zeros of the higher harmonic. If gravity anomalies are investigated by means of harmonic analysis, then the set of harmonics can be considered on a segment of profile instead of discretely defined values of anomalies. The order of the higher harmonic is determined by the number of points taken on the profile. Taking into consideration the specific character of gravity surveys, it should be noted that it is more convenient to carry out the expansion in algebraic polynomials instead of expansions in trigonometrical polynomials. (Author)

Descriptors :   (*GEOPHYSICAL PROSPECTING, CORRELATION TECHNIQUES), GRAVITY, ANOMALIES, NETWORKS, ACCURACY, DENSITY, FOURIER ANALYSIS, POLYNOMIALS, CORRELATION TECHNIQUES, HARMONIC ANALYSIS, USSR

Subject Categories : Geodesy

Distribution Statement : APPROVED FOR PUBLIC RELEASE