Represented classes

Little or no slope: 0-3% gradient

Gentle slopes: 3-9% gradient

Moderate slopes: 9-15% gradient

Steep slopes: 15-30% gradient

Extremely steep slopes: 30-60% gradient

Excessively steep slopes: >60% gradient 


Slope map derived from SRTM data. The classes shown are derived form FAO Guidelines for Soil Description. The Shuttle Radar Topography Mission (SRTM) digital elevation dataset was originally produced to provide consistent, high-quality elevation data at near global scope. This version of the SRTM digital elevation data has been processed to fill data voids, and to facilitate its ease of use. 

Consortium for Spatial Information (CGIAR-CSI)

Source data

Consortium for Spatial Information (CGIAR-CSI)

SRTM digital elevation data

Shuttle Radar Topographic Mission (SRTM)


The CGIAR-CSI GeoPortal is able to provide SRTM 90 m 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. The SRTM digital elevation data provided on this site has been processed to fill data voids, and to facilitate it’s ease of use by a wide group of potential users. This data is provided in an effort to promote the use of geospatial science and applications for sustainable development and resource conservation in the developing world.

The NASA Shuttle Radar Topographic Mission (SRTM) has provided digital elevation data (DEMs) for over 80% of the globe. 

Spatial resolution

Global coverage

 (approx. 90 m resolution)  

Temporal resolution

Period of observation: 2019