SRTM data

The National Geospatial Intelligence Agency (NGA), announced that the highest-resolution (30 m) topographic data over Africa generated from NASA’s Shuttle Radar Topography Mission (SRTM) will be released globally.

For more details:

http://www.usgs.gov/blogs/features/usgs_top_story/enhanced-elevation-data-to-sharpen-global-focus-on-climate-issues/