Publication Date:
2013-07-07
Description:
[1] Reprocessed GOCE gravity gradient data were combined with data from LAGEOS-1/2 and GRACE to generate a satellite-only gravity field model to degree 260 using the direct approach, named DIR-R4. When compared to EGM2008 it is more accurate at low to medium resolution thanks to GOCE and GRACE data. When compared to earlier releases of ESA GOCE models, it is more accurate at high degrees owing to the larger amount of data ingested. It is also slightly more accurate than ESA's fourth release of the Time-Wise model (TIM-R4), as demonstrated by GPS/leveling, orbit determination tests, and an oceanographic evaluation. According to the formal, probably too optimistic by a factor 2 to 2.5, cumulated geoid (1.3 cm) and gravity anomaly (0.4 mGal) errors at 100 km resolution, the GOCE mission objectives have been reached.
Print ISSN:
0094-8276
Electronic ISSN:
1944-8007
Topics:
Geosciences
,
Physics
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