Tech & Sources
Software
GDAL, PostgreSQL/PostGIS, MapServer, Apache
Languages
Bash, SQL, HEG Tool
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)
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Notes
Image: Combined MODIS & SNODAS Layers
Process:
Daily Bash script gets MODIS & SNODAS using wget and does all processing. MODIS imagery is stitched together using EOS HEG Tool. 8 days of MODIS layers are merged. Every third day SNODAS is updated. Overlays are created for each image as defined by MapServer .map file and served as WMS.
WMS Resource:
https://gis.postholer.com/services/reflect?
layers=nlcdlite,snowcover8dayLatest,sweLatest,demshade,countylines,statelines,trace,wptByTrailType,pop
&bbox=-123.88,43.12,-107.44,49.11
&trail_id=1
&ids=4
&width=1024
&t_srs=EPSG:3857
&format=image/png
Interactive map using WMTS:
https://www.postholer.com/map/Continental-Divide-Trail/47.626529/-112.535706/8/snowcover8dayLatest,swelatest,meta,gap
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