Welcome to UNAVCO's IGS Site Log Manager GSAC Repository.


This data repository provides information about sites (monuments) in the UNAVCO IGS site log manager database. There are no data files of observations from geodesy instruments to download from this particular repository.

To begin searches for site information, click on Search Sites above. You can click on Help for guidance about using GSAC services.

GSAC-WS is a package for comprehensive user access to archives of geodetic data including GPS/GNSS. GSAC provides a web browser-based UI for data search, data file downloading, and a web services REST API. There is also a GSAC command line client, a Java-based client program for accessing a GSAC repository through its API, that allows users to do programmatic searches of a GSAC repository and to download files.

To learn more about GSAC and about other repositories, see the UNAVCO GSAC-WS website.