National Geodetic Survey Absolute Gravity Program

摘要

The National Geodetic Survey absolute gravity program will utilize the high precision afforded by the JILAG-4 instrument to support geodetic and geophysical research, which involves studies of vertical motions, identification and modeling of other temporal variations, and establishment of reference values. The document gives the scientific rationale of these objectives, defines the procedures used to collect gravity and environmental data in the field, and states the steps necessary to correct and remove unwanted environmental effects. In addition, site selection criteria, methods of concomitant environmental data collection and relative gravity observations, and schedule and logistics are discussed.