REGIONAL OSM DETAIL / VERSION 9 / 2026-10-10
© OpenStreetMap contributors, ODbL 1.0.
https://www.openstreetmap.org/copyright
Query: query.overpass. Server: https://overpass.private.coffee/api/interpreter
Raw response: osm.json. No raster map tiles are downloaded or bundled.
Coast patch: 16.0–17.35 E, 58.0–58.85 N. Directed coastline ways
polygonized with the patch boundary; land is on the left of each way.
Simplification tolerance 0.000035 degrees, roughly 2–4 metres locally.
Natural Earth broad coastline retained outside the patch. The transition
at the patch boundary is approximate; this is not expanded terrain elevation.
OSM roads and place nodes retain their mapped WGS84 positions. Road lines
are simplified and shown as orientation features, not surveyed road surfaces.
Rebuild with a Python environment containing shapely:
python scripts/build_region.py
The script uses backups/v8/geography-data.js for the broad Natural Earth base.
Export: viewer/region.geojson (OSM portion only); runtime: geography-data.js
and region-data.js. 1,024 places; 4,365 road ways; 5,469 land polygon parts.
Validation: closed valid land polygons; Norrköping and north shore on land,
central Bråviken at 16.4E 58.65N and sea at 17.2E 58.5N in water.
Visual comparison: https://www.openstreetmap.org/#map=12/58.645/16.4
