International Combination Service for Time-Variable Gravity Fields (COST-G): Start of Operational Phase and Future Perspectives

Adrian Jäggi, Ulrich Meyer, Martin Lasser, Barbara Jenny, Teodolina Lopez, Frank Flechtner, Christoph Dahle, Christoph Förste, Torsten Mayer-Gürr, Andreas Kvas, Jean-Michel Lemoine, Stéphane Bourgogne, Matthias Weigelt, Andreas Groh

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


The International Combination Service for Time-variable Gravity Fields (COST-G) is a new Product Center of IAG’s International Gravity Field Service (IGFS). COST-G provides consolidated monthly global gravity fields in terms of spherical harmonic coefficients and thereof derived grids of surface mass changes by combining existing solutions or normal equations from COST-G analysis centers (ACs) and partner analysis centers (PCs). The COST-G ACs adopt different analysis methods but apply agreed-upon consistent processing standards to deliver time-variable gravity field models, e.g. from GRACE/GRACE-FO low-low satellite-to-satellite tracking (ll-SST), GPS high-low satellite-to-satellite tracking (hl-SST) and Satellite Laser Ranging (SLR). The organizational structure of COST-G and results from the first release of combined monthly GRACE solutions covering the entire GRACE time period are discussed in this article. It is shown that by combining solutions and normal equations from different sources COST-G is taking advantage of the statistical properties of the various solutions, which results in a reduced noise level compared to the individual input solutions.
Original languageEnglish
Title of host publicationInternational Association of Geodesy Symposia
Place of PublicationBerlin, Heidelberg
PublisherSpringer Nature
Number of pages9
Publication statusPublished - 19 May 2020


  • Combined solutions
  • COST-G
  • IGFS Product Center
  • Time variable gravity

Fields of Expertise

  • Sustainable Systems


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