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Regional Models

KAZAKHSTAN (KazGM2015)


  Author: D.A. Shoganbekova     Created: 2015    Resp: D.A. Shoganbekova  
      Status: PRIVATE    
Description:
The Kazakh gravimetric geoid model (KazGM2015) is computed by applying the method developed at the KTH, which is based on least-squares modification of Stokes formula. Two sets of regional gravity data are used: the first one is provided by the GETECH. The long-wavelength contribution is taken from two geopotential models: GOCE DIR, EGM2008. SRTM is used to compute topography effects on the geoid. The KazGM2015model is computed on a 5 x 5 arc-min geographical grid over the computation area bounded by the parallels of 37 and 59 arc-deg northern latitude, and the meridians of 43 and 91 arc-deg of eastern longitude. The geoid heights are with respect to the WGS84 reference ellipsoid. The differences between the geoid undulations from GPS/Levelling and KazGM2015 change from -0.295 m to 0.327 m and the standard deviation is 0.177 m. The relative accuracy achieved was of the order of 1.219 ppm for baselines between 15 and 1633 kilometers.

References:
D. Shoganbekova, H. Fan, T. Pentayev (2015). Gravimetric geoid model over Kazakhstan. Proceedings of the 15th International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management (SGEM), 2(2), pp. 283-290. DOI: 10.5593/SGEM2015/B22/S9.035


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