TerrSet (formerly IDRISI) is an integrated geographic information system (GIS) and remote sensing software developed by Clark Labs at Clark University for the analysis and display of digital geospatial information.

TerrSet is a PC grid-based system that offers tools for researchers and scientists engaged in analyzing earth system dynamics for effective and responsible decision making for environmental management, sustainable resource development and equitable resource allocation.

In June 2020 Clark Labs released the TerrSet 2020 Geospatial Monitoring and Modeling software, version 19.

[3][4] Besides its primary research and scientific focus, TerrSet is popular as an academic tool for teaching the principal theories behind GIS at colleges and universities.

Based within the Graduate School of Geography at Clark University, Clark Labs and its software tools are known for advancements in areas such as decision support, uncertainty management, classifier development, change and time series analysis, and dynamic modeling.