Accession Number : ADA297438

Title :   Improved Estimation of the Earth's Gravity Field.

Descriptive Note : Final rept. 22 Oct 93-22 Apr 95,

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF GEODETIC SCIENCE AND SURVEYING

Personal Author(s) : Rapp, Richard H. ; Jekeli, Christopher

PDF Url : ADA297438

Report Date : APR 1995

Pagination or Media Count : 55

Abstract : This final report describes research activities carried out by three investigators. The studies of N. Balsubramania related to vertical datums and how one might use geodetic techniques to connect the many vertical datums of the world. In addition he implemented data analysis using information at 17 space geodetic stations in six regional vertical datums. This data, with gravity field information, was used to define a global vertical datum and relate the regional datums to the ideal datum. Rapp prepared several papers related to the vertical datum question. The papers emphasized the importance of the geoid undulation, or height anomaly, in connecting vertical datums. Aspects of this research led to a proposal for a World Vertical Datum. In order to determine an improved gravity field for vertical datum purpose, a joint MA/GSFC project was established. This report describes the role that Rapp and Jekeli have played in the project. Jekeli pursued studies related to improved ways to carry out a harmonic analysis of discrete and average values. These studies developed equations to describe the aliasing error of the harmonic coefficient estimate. Equations are described that, when used to calculate average values, reduce the aliasing effects. Two papers and two presentations reflecting research carried out under this contract are included as an appendix. (AN)

Descriptors :   *GRAVITATIONAL FIELDS, *GEODESICS, *GEOIDS, DATA BASES, MATHEMATICAL MODELS, POSITION(LOCATION), DATA MANAGEMENT, TERRAIN, REFLECTION, ESTIMATES, ERROR ANALYSIS, GLOBAL POSITIONING SYSTEM, LEAST SQUARES METHOD, DATA ACQUISITION, EARTH SURFACE, GEODETIC SATELLITES, EARTH MODELS, ELEVATION, HEIGHT, GRAVITY ANOMALIES, GEOPOTENTIAL, HARMONIC ANALYSIS.

Subject Categories : Geodesy

Distribution Statement : APPROVED FOR PUBLIC RELEASE