TerraSys GeoAssistant™ uses a wide variety of data issued from recognised sources * in order to document values of several environmental variables throughout the world. The program also uses these values to estimate a number of other variables required for environmental modelling.

Values documented or estimated by TerraSys GeoAssistant™ can then be exported to an Excel™ file or directly to a TerraSys™ conceptual model file.

* Main data sources include the National Aeronautics and Space Administration (NASA), the National Center for Atmospheric Research (NCAR), the National Geophysical Data Center (NGDC), the National Oceanic and Atmospheric Administration (NOAA) and the Cooperative Institute for Research in Environmental Science (CIRES). All the data used by the program are available in the public domain.