Coverage, spatial and temporal resolution
Period and temporal resolution:
Coverage and spatial resolution:
- Spatial resolution: up to degree/order 2190, about 9 km
- Geographic longitude: 180°W to 180°E
- Geographic latitude: 90°S to 90°N
- Dimension: depends on degree / order of the development of the spherical harmonics
- Altitude: --
- ASCII (Gravity Field Coefficient - GFC Format: Degree, Order, 2 spherical harmonics coefficients)
The geoid height differences between EIGEN-6C4 and EGM2008 indicates that the gravity field modeling is enhanced by the new GOCE data. The EIGEN-6C4 "corrects" the EGM2008, mainly over continent parts with bad terrestrial data coverage. The new combined gravity field model has been evaluated by GOCE orbit computations, GPS-Leveling comparisons and by comparisons in the spatial domain. The GPS-Leveling comparisons indicate that EIGEN-6C4 is almost the same performance as EGM2008 for the short wavelenghts. In the orbit test results the time variable EIGEN-6C4 gives the best results.
EIGEN-6C4 improves the orbit computation compared to GRACE models. The improved resolution is due to improved and new methods of satellite measurements (e.g SLR, GPS and K-Band Ranging), satellite gradiometry, the increased accuracy in the measurement of surface data and long-term data series.
More information is given in the references.
email: foer (at) gfz-potsdam.de
Groupe de Recherches de Geodesie Spatiale / CNES
email: richard.biancale (at) cnes.fr
ICDC / CEN / University of Hamburg
email: stefan.kern (at) uni-hamburg.de
Förste, Christoph; Bruinsma, Sean.L.; Abrikosov, Oleg; Lemoine, Jean-Michel; Marty, Jean Charles; Flechtner, Frank; Balmino, G.; Barthelmes, F.; Biancale, R. (2014): EIGEN-6C4 The latest combined global gravity field model including GOCE data up to degree and order 2190 of GFZ Potsdam and GRGS Toulouse. GFZ Data Services. doi.org/10.5880/icgem.2015.1