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feat: Kartverket ground heights for Statens vegvesen cameras

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The Vegvesen camera feed is 2D, so every camera shared one flat 150 m
ground prior and mountain-pass cameras could sit hundreds of metres below
the terrain where neither the point-height prior nor the ground snap
resolves. Each camera now gets its terrain height from Kartverket's
keyless point-height API (CC BY 4.0): ~840 of ~845 cameras.

- 50 points per request, six in flight; points a full batch answers null
  for are retried once in batches of 10 (the API drops points from large
  batches).
- Sea-floor depths (dybdekurver / Havflate) under bridges and quays
  count as the water surface, 0 m.
- Heights are cached by position, so the 15-minute refresh only asks
  about new or moved cameras. A catalog load waits at most 12 s; a slower
  lookup keeps filling the cache for the next refresh.
- CCTV_VEGVESEN_HEIGHTS=0 turns it off; Kartverket is credited beside
  Statens vegvesen in the attribution popover.

Follow-up to #929.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
Trygve HemminghyttandClaude Opus 5.5 committed 2026-10-05 21:46:20 +02:00
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@@ -2919,7 +2919,7 @@ its criteria cannot be silently ignored.
| Satellites | CelesTrak | `src/data/satellites.js` | `/api/celestrak` | 120s |
| Space Missions (30d) | Launch Library 2 + CelesTrak | `src/data/rocketLaunches.js` | `/api/launches` + `/api/celestrak/active` | 5 min |
| Traffic | Selectable TomTom / OpenStreetMap / Hybrid roads; optional TomTom flow (BYOK) | `src/data/traffic.js` | browser-direct OpenFreeMap tiles; `/api/tomtom` for flow | viewport-driven; capped tile cache |
| CCTV | Austin + Caltrans (CA) + TfL London + Ontario 511 + Fintraffic (FI) + DriveBC (BC) + TxDOT (TX) + Estonia (Tallinn, Tarktee) + Live Traffic NSW + Open Calgary Open Data + Statens vegvesen (NO, stills + live HLS) + Street View fallback | `src/data/cctv.js` | `/api/cctv` | 10s (active) |
| CCTV | Austin + Caltrans (CA) + TfL London + Ontario 511 + Fintraffic (FI) + DriveBC (BC) + TxDOT (TX) + Estonia (Tallinn, Tarktee) + Live Traffic NSW + Open Calgary Open Data + Statens vegvesen (NO, stills + live HLS, Kartverket ground heights) + Street View fallback | `src/data/cctv.js` | `/api/cctv` | 10s (active) |
| Radio | Radio Browser (public-domain station directory) | `src/data/radio.js` | `/api/radio/stations`, `/api/radio/click/:uuid` | 45 min directory refresh |
| Transit 🚌 | Operator GTFS-Realtime VehiclePositions (7 keyless regions, `src/data/transitFeeds.js`) | `src/layers/transit/` via `src/app/layers/transit.js` | `/api/transit` | 15s (poll + delayed playback) |
| Bikeshare 🚲 | GBFS (Lyft + BCycle) | `src/data/bikeshare.js` | `/api/gbfs` | 60s |