The main objective of the GOCO initiative is to compute high-accuracy and high-resolution global gravity field models from complementary gravity data sources:
The combination is done by superposition of full normal equations and applying optimized relative weighting strategies.
GOCO has been initiated in the frame of ESA's GOCE Data AO (project no. 4248), with the project partners responsible for the GOCE-only time-wise (TIM) models as the nucleus.
The GOCO consortium is composed of the following institutions, co-ordinated by the Institute of Astronomical and Physical Geodesy at Techinical University of Munich:
More information can be found under goco.eu.
GOCO2025s is a satellite-only, global gravity field model up to degree and order 300, with constrained secular, annual, and semi-annual variations up to degree and order 200.
GOCO2025s is the latest release in the Gravity Observation Combination (GOCO) series. The model is based on satellite data collected between 2002 and 2024 (inclusive). Contributing satellite missions include GOCE (TIM6 gradiometer observations), GRACE and GRACE-FO (KBR and LRI observations), as well as kinematic orbits from CHAMP, GOCE, Swarm A/B/C, Sentinel-1A/1B/2A/2B/3A/3B/6A, TerraSAR-X, TanDEM-X, and satellite laser ranging observations (ITRF2020 reference frame) to AJISAI, BLITS, LAGEOS-1, LAGEOS-2, LARES, LARES-2, LARETS, Starlette and Stella. The temporal variations include observations up to degree and order 150 and are regularized using isotropic noise, separated by land/ocean masks up to degree and order 200. The combination of individual data sources is based on the full system of normal equations, with relative weighting among the constituents determined via variance component estimation.
The individual files of GOCO2025s contain (available at https://doi.org/10.3217/f48p8-8h651):
When using the data please cite:
Öhlinger, F., Mayer-Gürr, T., Krauß, S., Dumitraschkewitz, P., Süsser-Rechberger, B., Strasser, A., Tieber-Hubmann, C., & Brockmann, J. M. (2025). The satellite-only gravity field model GOCO2025s [Data set]. Graz University of Technology. https://doi.org/10.3217/f48p8-8h651
Felix Öhlinger
Steyrergasse 30/III
8010 Graz
Austria
Tel: +43/316/873- 6333
Fax: +43/316/873-6845
felix.oehlinger @tugraz.at
Sandro Krauss
Steyrergasse 30/III
8010 Graz
Austria
Tel: +43/316/873- 6344
Fax: +43/316/873-6845
sandro.krauss @tugraz.at
Patrick Dumitraschkewitz
Steyrergasse 30/III
8010 Graz
Austria
Tel: +43/316/873- 6333
Fax: +43/316/873-6845
patrick.dumitraschkewitz @tugraz.at
Andreas Strasser
Steyrergasse 30/III
8010 Graz
Austria
Tel: +43/316/873-6347
Fax: +43/316/873-6845
andreas.strasser @tugraz.at
Cornelia Tieber-Hubmann
Steyrergasse 30/III
8010 Graz
Austria
cornelia.tieber-hubmann @tugraz.at