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Recent advances in the acquisition and use of terrain data for geoid modelling over the United States

  • D. A. Smith
  • D. R. Roman
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 121)

Abstract

For much of the past decade, high resolution geoid models have been produced at the National Geodetic Survey (NGS). The use of digital elevation models (DEMs) has been important to the computation of geoid models, but has also been one of the primary limitations of the geoid accuracy due to both poor data quality and a series of computational approximations. Recent steps have been taken at NGS to replace existing DEM data with data of finer resolution and higher quality. Additionally, new computational tools are being implemented which no longer rely on accuracy-reducing approximations. By moving toward more accurately computed terrain-induced gravity signals, errors in gravity anomalies exceeding tens of mGals have been removed, and subsequently centimeters of geoid accuracy have been gained.

Keywords

Geoid elevation models terrain effects 

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References

  1. Schwarz, KP, MG. Sideris and R. Forsberg (1990). The use of FFT techniques in physical geodesy. Geophysical Journal International, Vol 100, pp. 485–514CrossRefGoogle Scholar
  2. Smith, D.A., D.G. Milbert (1999). The GEOID96 high resolution geoid height model for the United States, Journal of Geodesy, Vol 73, No. 5, pp 219–236CrossRefGoogle Scholar
  3. Smith, D.A., D.S. Robertson, D.G. Milbert (1999). The gravitational attraction of local crustal masses in spherial coordinates, submitted to Journal of Geodesy Google Scholar
  4. Smith, D.A. and D.R. Roman (1999). A new high resolution DEM for the Northwest United States, submitted to Surveying and Land Information Systems Google Scholar

Copyright information

© SPringer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • D. A. Smith
    • 1
  • D. R. Roman
    • 1
  1. 1.NOAA/National Geodetic SurveySilver SpringUSA

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