OpenStreetMap-derived coastline overlays
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Coastline data source: OpenStreetMap contributors, via the OSMCoastline
processed global line Shapefile at:
https://osmdata.openstreetmap.de/data/coastlines.html
https://osmdata.openstreetmap.de/download/coastlines-split-4326.zip

OpenStreetMap data is available under the Open Database License (ODbL) 1.0:
https://opendatacommons.org/licenses/odbl/1-0/
https://www.openstreetmap.org/copyright

Attribution: © OpenStreetMap contributors

coast_nh_osm.geojson and coast_sh_osm.geojson are locally simplified and
cropped derived data, not a substitute for original OSM data. Preserve
this license and attribution when distributing or publishing the overlays.
The build process preserves the source attribution in GeoJSON metadata.

IMPORTANT: The previous GSHHG coast_nh.geojson / coast_sh.geojson may still
be present after installing the patch, but the new viewer does NOT read them.
Only the files named *_osm.geojson are used for the coastline overlay.

Feature-label names and anchor points are a separate manually curated
editorial overlay; consult LABEL_SOURCES.md. They do not represent live
measurements, and are not part of the OSM coastline dataset.