Constellation-dependent GNSS precipitable water vapor retrieval under humid conditions in Beijing: reported results and reproducibility data

Machine-readable reported results, derived rainfall-event tables, source registry, data dictionary, and final figures supporting a regional comparison of five GNSS constellation configurations around the Beijing radiosonde site during June–September 2023–2025. The archive contains validation metrics, moisture-stratified error summaries, selected rainfall-peak cases, retrospective short-lead rainfall-frequency summaries, and summary statistics for seven rainfall onsets. Provider-controlled raw GNSS, ERA5, CLDAS-V2.0, and radiosonde files are not redistributed. The short-lead analysis is retrospective and exploratory and does not constitute independent operational forecast validation.