In rP18523, Alpha 21, _kali has created random map scripts (for example Red Sea and Mediterranean) that import the famous SRTM v4 digital elevation model.
Since a free software project needs to include the license of all imported work, we need to state that data source clearly.
The SRTM v4 data was downloaded via a script written by _kali here https://github.com/kali0ad/mappr/blob/master/dstk.go
from the the Data Science Toolkit http://www.datasciencetoolkit.org/coordinates2statistics which just makes the existing data accessible without a prior download of the complete SRTM v4 data.
That DSTK data actually uses the SRTM v4 data can be seen here:
http://www.datasciencetoolkit.org/developerdocs#coordinates2statistics
elevation - The height of the surface above sea level at this point. From the NASA and the CGIAR Consortium for Spatial Information
with a link to http://srtm.csi.cgiar.org/
(Yes, I did check that dstk website at the time, no I didn't commit it properly).