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Viewshed/Isovists

Viewshed/Isovists

Click image to view current layer on interactive map.

Tech & Sources

Software
GDAL, PostgreSQL/PostGIS, MapServer, Apache

Languages
Bash, SQL

Data Sources (one or more):
U.S. Geological Survey (USGS), U.S. Forest Service (USFS), National Elevation Data (NED), National Land Cover Data(NLCD), National Hydrography Data (NHD), Tiger/Line Census, 3D Elevation Program (3DEP), Geographic Names Information Service (GNIS), Open Street Map (OSM), Protected Areas Database v2.1 (PAD), National Interagency Fire Center (NIFC), National Weather Service (NWS), NASA, NOAA, National Wildfire Coordinating Group (NWCG), AirNOW.gov, U.S. Department of Interior (DOI), National Digital Forecast Database (NDFD), European Space Agency (ESA), USAFacts.org, ESRI, Google, Continental Divide Trail Coalition, Appalachian Trail Conservancy (ATC), National Snow and Ice Data Center (NSIDC), PRISM Climate Data Oregon State University, et al, and data collected in the field (trail trace)

Notes

Image: Viewshed, locations on trail where Mt. Shasta is visible.

Using NED rasters and gdal_viewshed create a raster view shed of the Mt. Shasta area. Next, do an intersection of that raster and trail vector data resulting in relevant trail geometry.

WMS Resource:
https://gis.postholer.com/services/reflect?
   layers=nlcd,statelines,countylines,demshade,viewshed,trace,pop
   &trail_id=1
   &ids=2,3
   &width=1000
   &t_srs=EPSG:3857
   &bbox=-123.78,40.35,-120.89,42.12
   &format=image/png

Interactive map using WMTS:
https://www.postholer.com/google-map/Pacific-Crest-Trail/1?
   trail_id=1
   &vw=1
   &zoom=11
   &lat=41.312446
   &lon=-122.303104
   &viewshed=1

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