Surf these sites: EGM96: NASA GSFC and NIMA Joint Geopotential Model -- EGM96 is a spherical harmonic model of the Earth''s gravitational potential complete to degree and order 360. Geodesy Group at University of New Brunswick, Canada -- Research in Geodesy and precision navigation. Advanced researches in 1 cm geoid determination and alternative navigation filters design. Open call for cooperation to all groups with similar interests. Geodetic Datum Overview -- Introduction to geodetic datums, geometric earth models, global coordinate systems (such as latitude and longitude), datum conversions, and related topics. University of Texas. Land Surveying and Geomatics: Geodesy -- a list of good starting points NIMA Physical Geodesy Branch Home Page -- This branch in the Geodesy and Geophysics Department in NIMA is responsible for collecting, processing, and evaluating gravity data (free-air and Bouguer gravity anomalies). The Geoid Page -- The primary function of this page is to link to resources of interest in geoid research. However, I keep that interpretation rather broad. So, for example, one might find links related to accuracy of GPS ellipsoid heights, or vertical datum issues. Yildiz technical university -- surveying programme is explained
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