HR: 0800h
AN: G31A-0788    [Abstracts]
TI: Impact of Local Gravity Observations on a Littoral Geoid
AU: * Roman, D R
EM: dan.roman@noaa.gov
AF: National Geodetic Survey, NOAA, 1315 East-West Highway SSMC3, #9317, N/NGS6, Silver Spring, MD 20910 United States
AB: Aerogravity data collected over the Bay of Maine region were merged with existing terrestrial, shipborne, and altimetric gravity anomalies to improve the spatial and spectral characteristics of the gravity field. Previous gravimetric geoid models developed for the Conterminous United States have lacked significant data from the shoreline out to about 100 km offshore. Beyond this region, the altimetric gravity anomalies are more reliable because ocean and tide models are more accurate. Collection of data for this near-shore region in a systematic manner refined the determination of the geoid. It, thereby, enhanced discussion of the absolute accuracy of datums such as the North American Vertical Datum of 1988 as well as Sea Surface Topography. Comparison of the resulting gravimetric geoid model to available GPS/leveling data provides an independent metric for local improvements.
UR: http://www.ngs.noaa.gov/geoid/
DE: 1204 Control surveys
DE: 1214 Geopotential theory and determination
DE: 1219 Local gravity anomalies and crustal structure
DE: 1247 Terrestrial reference systems
DE: 1255 Tides--ocean (4560)
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting