ArcticDEM is an NGA-NSF public-private initiative to automatically produce a high-resolution, high quality, digital surface model (DSM) of the Arctic using optical stereo imagery, high-performance computing, and open source photogrammetry software.
So, if you a) work in the Arctic and b) need a DEM, this may be a great option for you.
Very cool: the Arctic DEM Explorer (running on Esri ArcGIS Online).
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