Welcome to the UNAVCO Expanded Analysis GSAC Repository


This GSAC Repository provides information about sites (monuments) from the UNAVCO Expanded Analysis database.

To begin searches for site information, click on Search Sites above. You can click on Help above for guidance about using GSAC services. There are no data files of observations from geodesy instruments to download from this particular repository.

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 UNAVCO's GSAC web site.

UNAVCO engineer Peter Gray installs a GPS station north of Mount St. Helens (UNAVCO photo). ~