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Regional Models

Arctic


  Authors: A.N. Marchenko, B.B. Dzhuman     Created: 2015    Resp: A.N. Marchenko  
      Status: PUBLIC    

Description:
This model is a gravimetric quasi-geoid for the Arctic region limited by 65° N by latitude. It is based on gravity data collected by NGA in the framework of the Arctic Gravity Project (AGP). A remove-restore procedure was applied by using EGM2008 up to degree/order 360 as reference global model. The residual quasi-geoid heights are computed from the residual gravity anomalies by using the adjusted spherical harmonic analysis (ASHA) for local gravity field modelling. The orthogonality property in longitude for the chosen base system was taken into account to significantly decrease the computational time of the residual coefficients. The final quasi-geoid model is evaluated on a grid with 5'x5' resolution and it is referred to the GRS80 ellipsoid. The model has been validated by comparison with 49 GNSS/levelling points, obtaining that the standard deviation of the differences is equal to 22 cm.

References:
A.N. Marchenko, B.B. Dzhuman (2015). Regional quasigeoid determination: an application to Artic Gravity Project. Geodynamics, 1(18), pp. 7-17.
A.N. Marchenko, B.B. Dzhuman (2016). Regional quasigeoid determination: an application to Artic Gravity Project (AGP) area. Unpublished extended astract.

Arctic