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Regional Models

Northern Andalusia - Spain


  Authors: M.C. de Lacy, et al.     Created: 2001    Resp: M.C. de Lacy  
      Status: PRIVATE    

Description:
This is a gravimetric geoid for the Spanish region of Northern Andalusia. In particular it covers the area with limits 37.3° < lat. < 38.5°, -4.3° < lon. < -2.3°, and with a grid resolution of 3'x 3'. It is referred to the GRS80 ellipsoid and it is based on a subset of 1874 free-air anomalies extracted from the database of the Instituto Geografico Nacional (Spain). The gravimetric geoid was computed by the fast collocation technique in the framework of a remove-restore procedure. The used global geopotential model was OSU91A up to degree and order 360. The digital terrain model with a grid spacing of 100 m x 100 m was provided by the Servicio Geografico del Ejercito (Spain). The resulting gravimetric model was assessed by comparing it with GPS/levelling data at benchmarks belonging to the Spanish first-order levelling network. After removing a plane from the discrepancies, their standard deviation amounts to 5 cm.

References:
M.C. de Lacy, G. Rodriguez-Caderot, E. Marin, A. Ruíz, M.J. Borque, A.J. Gil, L. Biagi (2001). A gravimetric geoid computation and comparison with GPS results in Northern Andalusia (Spain). Studia Geophysica et Geodaetica, 45(1), pp. 55-66.


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