Finds the smallest geofarbik extract which contains a given Polygon.
Preparations:
npm install # installs dependencies
npm run preprocess # downloads geofabrik metadata and creates a file "geofabrik.geojson" with all extract bounds
npm run browser # optional, browserifies the module ("findExtract.js")
API:
findExtract(polygon, geofabrik)
Returns the name of the smallest (by area) geofabrik extract that still fully contains the polygon (supplied as a GeoJSON feature). Requires the data from geofabrik.geojson as the second parameter (run npm run preprocess to generate it).