Developmental Efforts to Improve the Accuracies of Geodetic and Geophysical Surveys.
Abstract
The Defense Mapping Agency (DMA) performs major geodetic and geophysical surveys to support the mapping, charting, and geodesy requirements of the Department of Defense. These survey requirements are often at the edge of the state-of-the-art and require extensive DMA involvement in the development and testing of new survey methodology. This paper covers the results of recent test and evaluation programs involving prototype and state-of-the-art production instrumentation for astronomic position and azimuth determinations, multi wavelength distance measurements, and improvements in gravity measurements. The treatment of principal error sources in astronomic positioning through the use of the recently developed charge coupled device eyepiece to eliminate personal equation bias, the investigation of precise astrolabes, the establishment of precise astronomic reference stations, and the status of current research for the developement of a two color refractometer to correct for anomalous atmospheric refraction are discussed. Also covered are the acceptance tests and future plans for the improvement of distance measurement (Terrameter). Brief discussions of DMA's participation in programs to improve the U.S. Gravity Base Network, the acquisition, reduction, and adjustment of relative gravity surveys, and support to the field testing of an absolute gravity apparatus are included.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1983
- Accession Number
- ADA124744