GEOiD 32-bit. Download here the 32-bit version of GEOiD, GEOiD-SBV and GEOiD-Viewer. The 32-bit version does also work on a 64-bit computer. If you don't use version 8.2 yet, you also need to download a new software license to be able to use version 8.4. Download GEOiD (32-bit) Install has to be done with Administrator rights. The comparisons show significant improvements over EGM08 and older geoid models, and also highlight the problems of global sea level models, especially in sea ice covered regions, and the definition of a new consistent vertical datum of Greenland.
InputDimension TypeDescriptionFirstScalarContains geocentric latitude in degrees,where north latitude is positive, and southlatitude is negative. Input latitude must be oftype single or double. If latitude is not in therange from -90 to 90, the block wraps it to bewithin the range.SecondScalarContains geocentric longitude in degrees,where east longitude is positive in the range from0 to 360. Input longitude must be of type singleor double. If longitude is not in the range from 0to 360, the block wraps it to be within therange.
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.The geoid ( ) is the shape that the surface would take under the influence of the and of alone, if other influences such as winds and were absent. This surface is extended through the continents (such as with very narrow hypothetical canals). According to, who first described it, it is the 'mathematical ', a smooth but irregular surface whose shape results from the uneven distribution of mass within and on the surface of Earth. It can be known only through extensive gravitational measurements and calculations. Despite being an important concept for almost 200 years in the history of and, it has been defined to high precision only since advances in in the late 20th century.All points on a geoid surface have the same (the sum of and potential energy). The force of gravity acts everywhere perpendicular to the geoid, meaning that point perpendicular and parallel to the geoid if only gravity and rotational acceleration were at work.
The surface of the geoid is higher than the reference wherever there is a positive (mass excess) and lower than the reference ellipsoid wherever there is a negative gravity anomaly (mass deficit). And Geoid anomalies caused by various crustal and lithospheric thickness changes relative to a reference configuration. All settings are under local compensation.Variations in the height of the geoidal surface are related to density anomalous distributions within the Earth. Geoid measures help thus to understand the internal structure of the planet.
Synthetic calculations show that the geoidal signature of a thickened crust (for example, in produced by ) is positive, opposite to what should be expected if the thickening affects the entire. Moritz (2011). 'A contemporary perspective of geoid structure'. Journal of Geodetic Science.
1 (March): 82–87. Retrieved 15 June 2016.External links Look up in Wiktionary, the free dictionary. Visualizing the geoid in 3D, with and without exaggeration.
provides a utility GeoidEval (with source code) to evaluate the geoid height for the EGM84, and EGM2008 earth gravity models. Here is an. (964KB pdf file). (PhD Thesis PDF). Retrieved 15 June 2016.