From Development to Systematic Production: SAGSA Generates Space-Based Gravimetry Products (L2–L4) from GRACE and GRACE-FO Data for the Scientific Community

by Thoumieux, F., Michaël, A., Blazquez, A., Boniface, C., Boughanemi, A., Bouih, M., Bruinsma, S., Couhert, A., Dibarboure, G., Dorandeu, J., Gachet, F., Garnier, J., Gaugain, S., Lavergne, E., Lecomte, H., Lemoine, J.-M., Meyssignac, B., Pellereau, E., Perosanz, F., Pfeffer, J. and Reinquin, F.
GRACE Science Team Meeting 2026
(poster) October, 2026

For over twenty years, CNES has provided the scientific community with gravimetric solutions ranging from levels L2 to L4.

L2: Spherical harmonic and gridded models derived from the GRACE and GRACE-FO missions.
L3: Combinations of these solutions with products from other centers for hydrology, oceanography, and glaciology.
L4: Integration of space-based gravimetry with other observations (altimetry, etc.) to monitor essential climate variables.

The SAGSA project, launched in 2025, is funded by CNES and implemented by Magellium. It automates the production chain from L2 to L3/L4 products, with monthly or bi-annual updates. Products are automatically distributed to the IR DATATERRA data hubs (FORMATERRE, THEIA, ODATIS), leveraging, among others tools, the CNES GEODES portal. By automating these levels, SAGSA establishes an operational framework that will support the future ESA/NASA MAGIC-NGGM mission

BibTeX citation