Hydrologically Corrected SRTM Elevation Model for Africa

Africa Soil Information Service provides a hydrologically corrected Digital Elevation Model for the African continent. The dataset was produced at the World Agroforestry Centre in Nairobi, Kenya, using the CGIAR-CSI SRTM 90m Version 4 as its source. It is designed to support the prediction of soil properties and other environmental applications.

Use Cases

• Model soil property distribution using corrected elevation and derived terrain attributes.
• Analyze erosion and landslide risk by calculating slope and flow accumulation from the filled DEM.
• Delineate watershed boundaries and simulate hydrological flowpaths for water resource management.
• Identify internal drainage basins by analyzing the placed null cells in depressions deeper than 20 meters.

Strengths

• Source data is the well-regarded CGIAR-CSI SRTM 90m Version 4 DEM.
• Hydrological correction process specifically accounts for natural internal drainage systems.
• Correction algorithm defined with specific parameters, filling depressions exceeding a 20m depth and 1000-pixel area.

Limitations

• Spatial resolution is 90 meters, which may be too coarse for local-scale studies.
• The correction process may alter original elevation values in depression areas.
• Temporal coverage depends on the source SRTM data, which is not recent.

Provenance

Source

World Agroforestry Centre (ICRAF), distributed by the Africa Soil Information Service (AfSIS).

Collection Method

Hydrological correction applied to the CGIAR-CSI SRTM 90m Version 4 source DEM.

Time Range

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Freshness

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Geography

Continent of Africa.