SPOTGINS: a new global GNSS tropospheric delay data set derived using GINS software

SPOTGINS provides global GNSS station position and zenith tropospheric delay (ZTD) time series for nearly 5,000 stations, covering the period from May 2000 to the present. SPOTGINS is a consortium of research institutions — initially French, now expanding internationally — that processes a global station network using CNES’s GINS software in precise point positioning (PPP) mode with integer ambiguity resolution. The initiative leverages the expertise and advanced satellite products of GRG, the French IGS Analysis Center operated by CNES and CLS. By adopting a standardized processing strategy, auxiliary products, and consistent metadata, the consortium distributes computational workload among partners while maintaining sub-millimeter-level consistency in positions and ZTDs.This paper presents results from the first large-scale quality assessment of SPOTGINS ZTD time series. Evaluation metrics include outlier detection statistics, bias and random noise estimation against independent references, and tests of temporal homogeneity.