A composed satellite photograph of <a href="https://en.wikipedia.org/wiki/Africa" class="extiw" title="en:Africa">Africa</a>.
NASA
<p>The image is from <a rel="nofollow" class="external autonumber" href="https://archive.org/details/VE-IMG-2433">[1]</a> ("Blue Marble: Land Surface, Shallow Water, and Shaded Topography ", 2002). I took the two 21600x21600 images, <a rel="nofollow" class="external text" href="http://visibleearth.nasa.gov/images/2433/land_shallow_topo_west.tif">land_shallow_topo_west.tif</a> and <a rel="nofollow" class="external text" href="http://visibleearth.nasa.gov/images/2433/land_shallow_topo_east.tif">land_shallow_topo_east.tif</a>, and composed them. I cropped the resulting image at 8460x8900+19400+6200. 
</p><p>Regarding the source data of the original, NASA-Blue Marble file, it is being explained <a rel="nofollow" class="external autonumber" href="https://archive.org/details/VE-IMG-2433">[2]</a> that it
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<ul><li>used a set of satellite-based observations to yield an image with 1 km² (0.386 square mile) resolution</li>
<li>most information comes from NASA’s <a href="//commons.wikimedia.org/wiki/MODIS" class="mw-redirect" title="MODIS">MODIS</a> instrument (Moderate Resolution Imaging Spectroradiometer)</li>
<li>data were collected from June through September 2001</li>
<li>ocean data has two sources: (i) shallow water true color data, and (ii) global ocean color/chlorophyll data</li>
<li>elevation data stem from the GTOPO 30 dataset by the U.S. Geological Survey’s EROS Data Center</li></ul>