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SNODAS & MODIS

SNODAS & MODIS

Click image to view current layer on interactive map. Above static image does not reflect current conditions.

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)

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/google-map/Pacific-Crest-Trail/1?
   vw=0
   &zoom=7
   &lat=45.790559
   &lon=-115.432565
   &smcover=1

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