README.md

osm-peak-dominance

For each Openstreetmap peak, calculate its dominance using grass GIS with SRTM DEM data

Topographic Isolation in OSM

Workflow

• query Openstreetmap Overpass API natural=peak within a bbox
• for each peak,
  • calculate topographic isolation (r.li.dominance)
  • if necessary, download SRTM tile(s)
  • add tag to OSM node TODO: propose scheme

Set Up

• npm install && npm start

Goal

Peaks (mountain summits) are attributed with a dominance weight („Dominanz“) which then can be of interest for map rendering. A peak of a higher dominance takes label rendering precedence over a less dominant peak.

Outlook

• Grouping peaks of "the same" mountain by determining their topographic prominence („Schartenhöhe“)

References

• Topographic isolation / de
• Topographicprominence / de

Data Sources

• OpenStreetMap
• SRTM digital elevation model: http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/

Credits

• Image by Gretarsson, licensed under CC BY-SA 3.0.