Friday, May 27, 2016

Go North - Alaska Gets (Partial) Elevation Data

The USGS has been adding portions of Alaska to the National Elevation Dataset (NED), and although coverage isn't anywhere near complete, I finally decided it was time to pull the trigger on an initial buildout of elevation data for Alaska.

current coverage footprint
The buildout includes:

  • Normal and enhanced relief
  • 40' contours
  • Elevation data
  • DEM shading, viewsheds and sunlight analysis
  • View from here
  • Fixed and gradient slope shading


Denali looks kind of mellow until you turn on slope angle shading, at which point the West Buttress route becomes a little more obvious.

My viewshed and sunlight layers, as well as the view from here feature, assume that nothing is higher than about 14k, as a performance optimization feature.  So for the moment, the view of Denali from Hunter looks a little messed up:



I still don't have canopy and or land coverage data for Alaska or Hawaii, so while I can display terrain stats, those fields are blank:


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