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Regional Models

Austria (GV_GEOID)


  Authors: R. Pail, et al.     Created: 2008    Resp: BEV  
      Status: PRIVATE    
Description:
This is the official geoid model for Austria, covering the area 46.3° < lat < 49.1°, 9.5° < lon < 17.3° with a grid spacing of 1.5' in latitude and 2.5' in longitude. It is defined in ETRS89 and refers to the ellipsoid GRS80. It is based on 14.001 gravity anomaly values, 672 deflections of the vertical and 170 GPS/levelling observations. The computation was performed in the framework of a remove-restore procedure, modelling the long wavelengths of the gravity field by the EIGEN-GL04S global model, and the short wavelengths by the Airy-Heiskanen model with a standard density of 2670 kg/m3. A digital terrain model with a resolution of 44 x 49 m was assembled as a combination of regional Austrian and Swiss models, as well as SRTM for the neighbouring countries. The Least Squares Collocation (LSC) technique was used for the geoid computation, interpolating the empirical covariance of the residual quantities by the Tscherning-Rapp analytic covariance model. Special care was devoted to the optimal relative weighting of the input data, namely to the noise covariance models, especially concerning the GPS/levelling observations. The resulting hybrid geoid model was assessed by comparing it with independent GPS/levelling information, leading to an estimated accuracy of the order of 2-3 cm over the whole Austrian territory.

References:
R. Pail, N. Kühtreiber, B. Wiesenhofer, B. Hofmann-Wellenhof, C. Ullrich, N. Höggerl, D. Ruess, E. Imrek (2009). The official Austrian geoid solution 2008: Data, Method and Results. Poster presentation at EGU General Assembly 2009, 19-24 April 2009, Vienna, Austria.
N. Höggerl, C. Ullrich, R. Pail (2009). The Austrian Geoid 2008. Poster presentation at EUREF Symposium 2009, 27-30 May 2009, Florence, Italy.
R. Pail, N. Kühtreiber, B. Wiesenhofer, B. Hofmann-Wellenhof, G. Of, O. Steinbach, N. Höggerl, E. Imrek, D. Ruess, C. Ullrich (2008). The Austrian Geoid 2007. Vermessung & Geoinformation 1/2008, pp. 3-14.


Austria