EGM96

EGM96 (Earth Geopotential Model 1996) is a geopotenziale model of the land surface constituted from one sum of spherical harmonicas until 360° the order and degree. It is a solution composed of with of equations differentiates them, formed give:

1. one arranged solution of 70° the order and degree
2. a diagonal solution to blocks from the degree 71° until the 359°
3. the solution of quadrature for the degree 360°

This model is the result of one collaboration between the National Imagery and Mapping Agency (NIMA), the Goddard Space Flight Center of NASA andthe Ohio Been University.

In the preparation of the map with resolution 30' x30 ' of the gravity anomalies , beyond to the values it uses you in the previous models, has been assembled one new topographical base of data of all the sources available. The base of data then is used for the isostatico filling of the globe part not covered from the data (approximately 3% of the total). Model EGM96 has been used like geodetic reference in order to modernize the WGS84.