GSAC is web services for discovery of instrumented site information, and of instrument data files, available in an archive, to provide site and instrument information in a variety of standard formats (RINEX, XML, csv, GAMIT, SINEX, Json, png, ...), and to show where (URLs) to download instrumental data and derived-product files.
GSAC is intentionally built to handle many kinds of Earth science data from instruments with Earth locations, and derived products from such data. For example, GNSS receivers for geodesy, tide gages, met stations, tiltmeters, strainmeters. ...