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MAPGEO2015 - Geoid undulation model


Digital model that provides the factors to convert altitudes given by GNSS receivers, resulting in altitudes compatible with the terrestrial gravity, more suitable to describe the flow of liquid masses, like those needed in large irrigation projects, hydroelectric generation, etc.

In technical terms, a model to convert altitudes numerically describes the separation between the ellipsoid of reference of the geometric altitudes - also called ellipsoidal, resulting from the use of Global Navigation Satellite Systems (GNSS) - and the surface of reference of the physical altitudes, which is the vertical datum of the High-Precision Altimetric Network (RAAP) of the Brazilian Geodetic System (SGB), in the case of Brazil. From the geodetic coordinates resulting from the suitable processing of the observations collected through a geodetic GNSS receiver, the factor to convert geometric altitudes into physical altitudes should be extracted from the model.

The first models to convert altitudes published by the IBGE where the geoid models of the MAPGEO series, produced in partnership with the University of São Paulo (USP). MAPGEO92, MAPGEO2004, MAPGEO2010 and MAPGEO2015. The last one was the basis to develop the most recent model, hgeoHNOR2020, which opens a new series of models characterized by a better adaptation to the altitudes present in RAAP.