Iberian Gravimetric Geoid of 2005

On the Iberian Peninsula (including Spain, Portugal and Andorra), the Iberian Gravimetric Geoid of 2000 (IGG2005) relates the difference between the GRS80 ellipsoid and a surface approximating mean sea level. The model data exist in a single binary file consisting of a 1.5 by 1.5-minute grid of elevation difference between the two surfaces. The elevation differences at non-grid point locations are interpolated.

The "IGG2005" vertical transform has the following parameters:

The path parameter can either be fully qualified or relative to the location of the data source file in which it is defined. The path string should not end with a slash character.