TerraLib is an open-source geographic information system (GIS) software library. It extends object-relational database management systems (DBMS) to handle spatiotemporal data types.

Using TerraLib, the TerraView open-source GIS was developed, which provides functions for data conversion, visualization, exploratory spatial data analysis, spatial statistical modelling and spatial and non-spatial queries.

Another application is TerraAmazon, Brazil's national database for monitoring deforestation in the Amazon Rainforest. It handles more than 2 million complex polygons and 60 GB of remote sensing images.

The library supports different DBMS, including MySQL, PostgreSQL, and Oracle. Its vector data model is upwards compliant with Open Geospatial Consortium (OGC) standards. TerraLib supports the development of geographical applications using spatial databases.

The design goal for TerraLib is to support large-scale applications using socioeconomic and environmental data. It handles spatiotemporal data types (events, moving objects, cell spaces, modifiable objects) and allows spatial, temporal and attribute queries on the database. TerraLib supports dynamic modelling in generalized cell spaces and has a dynamic link with the R programming language for statistical analysis. It handles large image data sets. TerraLib is implemented as a library of C++ classes and functions, written in ANSI-C++, and has programming interfaces in Java and Visual Basic.

TerraLib has a core development team based in Brazil. The team includes the Image Processing Division of Brazil's National Institute for Space Research (INPE), and the Computer Graphics Technology Group of the Pontifical Catholic University of Rio de Janeiro (PUC-Rio). TerraLib is licensed as open-source according to the GNU Lesser General Public License (LGPL).

TerraView is a GIS application built on the TerraLib GIS library. TerraView handles vector data (polygons, lines, points) and raster data (grids and images), both of them stored in a relational or geo-relational database, including ACCESS, PostgreSQL, MySQL and Oracle Spatial. TerraView has a visualization interface that allows attribute and spatial queries on object in geographical database. The interface allows different views on the database, producing thematic maps with different types of legends.

TerraView is able to manage raster data in geographical database and allows the visualization and manipulation of raster data together with vector data. Raster data can be shared in different formats such as GeoTIFF, TIFF, JPEG, RAW, ASCII-Grid or ASCIISpring.^{[citation needed]}