Generator: DEM Net Elevation API - https://elevationapi.com
DEM Net Elevation API (elevationapi.com), under MIT license, free for less than 100K$ gross revenue companies.
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Digital Elevation Model: SRTM_GL3 OpenTopography - https://opentopography.org/
Farr, T. G., and M. Kobrick, 2000, Shuttle Radar Topography Mission produces a wealth of data. Eos Trans. AGU, 81:583-583.
Farr, T. G. et al., 2007, The Shuttle Radar Topography Mission, Rev. Geophys., 45, RG2004, doi:10.1029/2005RG000183. (Also available online at http://www2.jpl.nasa.gov/srtm/SRTM_paper.pdf)
Kobrick, M., 2006, On the toes of giants--How SRTM was born, Photogramm. Eng. Remote Sens., 72:206-210.
Rosen, P. A. et al., 2000, Synthetic
* Generator: [DEM Net Elevation API](https://elevationapi.com)
* Digital Elevation Model: [SRTM_GL3 OpenTopography](https://opentopography.org/)
* Imagery: [MapTiler Cloud Satellite](https://www.maptiler.com)
* Data: [OpenStreetMap and Contributors](http://www.openstreetmap.org)