The Earth Gravitational Model 2008 (EGM2008), developed by the National Geospatial-Intelligence Agency (NGA), has been released. The model provides worldwide coverage of gravity data at 5’x5′ mean resolution with geoid accuracy of 15cm. EGM2008 is constructed from a combination of GRACE satellite data, topographic data, altimetry on sea, and gravity observations on land areas. EGM2008 is developed up to degree/order 2160 with some additional terms up to degree/order 2190.The EGM2008 model coefficients and related products are freely available from the following Web site: Read More
