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  "road_source": "OpenStreetMap (local PBF extract)",
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  "osm_pbf_path": "/root/ni-survey/ireland-and-northern-ireland-2026-08-18.osm.pbf",
  "osm_snapshot": "2026-08-17T20:21:36Z",
  "elevation_provider": "OpenDataNI (OSNI / DfI Rivers River Basin LiDAR)",
  "elevation_licence": "Open Government Licence v3 \u2014 Crown copyright; Belfast City 2006 data \u00a9 Cyient Europe Ltd, published as open data by DfI",
  "elevation_dataset": "DfI Rivers Belfast City LiDAR 0.5 m DTM/DSM (March 2006)",
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  "notes": "EXTENDED by graph walk: +5 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Adopted 2026-08-18 (NI launch set \u2014 see docs/ni-coverage-survey.md). ENDPOINT-EXTENDED 2026-08-19 (audit_endpoints flag; re-walk under private-way-safe rules; confirmed via comparison batch).",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
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}