hasData_Center_Short_Name 
 Deutsches GeoForschungsZentrum GFZ

hasDataset_Online_Resource 

hasDataset_Release_Date 

hasDataset_Title 
 Using real polar terrestrial gravimetry data to overcome the polar gap problem of GOCE  the gravity field model IGGT_R1C

hasEntry_ID 

hasKeyword 
 GRACE
 geophysics
 geodesy
 GOCE
 IGGT_R1C
 Kaula Rule
 Polar Gravity Anomalies

hasSummary 

With the successful completion of ESA's PolarGAP campaign, terrestrial gravimetry data (gravity anomalies) are now available for both polar regions. Therefore, it is now possible to overcome the GOCE polar gap by using real gravimetry data instead of some regularization methods. But terrestrial gravimetry data needs to become filtered to remove the highfrequency gravity information beyond spher. harm. degree e.g. 240 to avoid disturbing spectral leakage in the satelliteonly gravity field models. For the gravity anomalies from the Arctic, we use existing global gravity field models (e.g., EGM2008) for this filtering. But for the gravity anomalies from Antarctica, we use local gravity field models based on a point mass modeling method to remove the highfrequency gravity information. After that, the boundaryvalue condition from Molodensky's theory is used to build the observation equations for the gravity anomalies. Finally, variance component estimation is applied to combine the normal equations from the gravity anomalies, from the GOCE GGs (e.g., IGGT_R1), from GRACE (e.g., ITSGGrace2014s) and for Kaula's rule of thumb (higher degree/order parts) to build a global gravity field model IGGT_R1C without disturbing impact of the GOCE polar gap. This new model has been developed by German Research Centre for Geosciences (GFZ), Technical University of Berlin (TUB), Wuhan University (WHU) and Huazhong University of Science and Technology (HUST).
Parameters
static model modelname IGGT_R1C
product_type gravity_field
earth_gravity_constant 0.3986004415E+15
radius 0.6378136460E+07
max_degree 240
norm fully_normalized
tide_system tide_free
errors formal

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