The toolbox includes classes to represent the important types of geospatial data, including "vector" points, lines and polygons, and spatially-referenced images, digital terrain elevation grids, and other gridded data sets. These classes help keep all the information for a given data set together in one place, ensuring self-consistency and ease of access. The toolbox also includes functions to operate on and analyze these data sets. These functions provide data transformation and analysis, ranging from buffer zones around lines and polygons, to profile, line-of-sight, and viewshed analyses of terrain elevation grids.