GEO files are converted directly from the geoid files downloaded from official sources. The video below shows how to import the files into Hydromagic. This page allows you to find and download the required geoid model in the ". Leica Geo Office Video Guide: Geoid Model Installation We only ship a selection of geoids with the software, because the package would be several hundreds of megabytes when we decide to include all these files. Svenska Edit links.Geoid models are used in Hydromagic to calculate tides, or the height of the bottom of a river or lake using a RTK receiver and a vertical datum.īy default, the installation package of Eye4Software Hydromagic only contains a small selection of geoid models. Kua number 7ĭownload as PDF Printable version. Help Learn to edit Community portal Recent changes Upload file. Redirected from EGM Retrieved 30 July April Journal of Geophysical Research: Solid Earth. This gravitational model is complete to spherical harmonic degree and order block diagonaland contains additional coefficients extending to degree and order It provides a raster of 2.įrom Wikipedia, the free encyclopedia. Among other new data sources, the GRACE satellite mission provided a very high resolution model of the global gravity. EGM96 is a composite solution, consisting of. The raster from EGM96 is provided at 15'x15' resolution. In addition, there have been major efforts to improve NIMA's existing 30' mean anomaly database through contributions over various countries in Asia. These collection efforts have improved the data holdings over many of the world's land areas, including Africa, Canada, parts of South America and Africa, Southeast Asia, Eastern Europe, and the former Soviet Union.
Major terrestrial gravity acquisitions by NIMA since include airborne gravity surveys over Greenland and parts of the Arctic and the Antarctic, surveyed by the Naval Research Lab NRL and cooperative gravity collection projects, several of which were undertaken with the University of Leeds. It took advantage of new surface gravity data from many different regions of the globe, including data newly released from the NIMA archives. The NGA provides the model in two formats: in a raster image recording the geoid height at each coordinate at a given resolution, or in a format providing the numerical parameters - the coefficients - defining the model.
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