Skip to main content

GIS: Geographic Information System: Imagery/Raster Data

Northwestern University Library's GIS guide.

Digital Elevation Data (DEMs)

The CGIAR-CSI GeoPortal is able to provide SRTM 90m Digital Elevation Data for the entire world. The SRTM digital elevation data, produced by NASA originally, is a major breakthrough in digital mapping of the world, and provides a major advance in the accessibility of high quality elevation data for large portions of the tropics and other areas of the developing world.