Open Data - BridgeWise

These are the OpenStreetMap-derived databases that ship inside the BridgeWise iOS app, offered here under the Open Database License 1.0 as its share-alike terms require. They are byte-for-byte the files in the app bundle.

You may share, adapt and use them commercially, provided you attribute OpenStreetMap, keep derived databases under the same licence, and do not lock them behind technical restrictions without also offering an unrestricted copy.

The files

All three cover a bounding box of 52.4–52.82°N, 1.28–1.78°E — the navigable Norfolk Broads, generously bounded.

How they were made

Extracted from the Overpass API with the queries below, then filtered and reshaped. The ODbL asks for either the derived database or the method that produced it; both are here.

broads-chart.geojson

Rivers, canals, named water bodies, major roads and settlement names. Unnamed water is discarded: it is overwhelmingly ponds, ditches and field drainage, which outnumber the navigation about five to one and are clutter at chart scale.

[out:json][timeout:180];
(
  way["waterway"~"^(river|canal)
quot;](52.4,1.28,52.82,1.78);
  way["natural"="water"](52.4,1.28,52.82,1.78);
  way["highway"~"^(motorway|trunk|primary|secondary)
quot;](52.4,1.28,52.82,1.78);
  node["place"~"^(town|village|hamlet)
quot;](52.4,1.28,52.82,1.78);
);
out geom;

moorings.json

Moorings, marinas, fuel and water points, and pubs within 150 m of the water. Each is given the bearing of the bank it lies on and the Reach it sits in — the stretch of water between two bridges — both computed from the river geometry in the chart above. Those two fields are additions to OpenStreetMap, not data from it.

[out:json][timeout:120];
(
  nwr["mooring"](52.4,1.28,52.82,1.78);
  nwr["leisure"="marina"](52.4,1.28,52.82,1.78);
  nwr["waterway"="fuel"](52.4,1.28,52.82,1.78);
  nwr["amenity"="pub"]["name"](52.4,1.28,52.82,1.78);
  nwr["amenity"="drinking_water"](52.4,1.28,52.82,1.78);
  nwr["man_made"="water_tap"](52.4,1.28,52.82,1.78);
);
out center tags;

obstacle-positions.json

Seven bridges, each the geometric intersection of an OpenStreetMap bridge way with the river centreline, confirmed by the name of the road that crosses it. The query below returns the crossings and the waterways; the intersection and the checking are done in tools/mapdata/bridges.py. What the app knows about those bridges — published headroom, tidal transfers, pilot requirements — is not OpenStreetMap data and is kept in a separate file that is not offered here.

[out:json][timeout:180];
(
  way["waterway"~"^(river|canal)
quot;]["name"](52.4,1.28,52.82,1.78);
)->.water;
(
  way["bridge"]["highway"](52.4,1.28,52.82,1.78);
  way["bridge"]["railway"](52.4,1.28,52.82,1.78);
)->.crossings;
(.water; .crossings;);
out geom tags;

What is not here

The app also carries data that does not come from OpenStreetMap and is not covered by this licence:

• Water levels from the Environment Agency real-time API, under the Open Government Licence. Fetched live by the app; nothing is redistributed here.
• Tidal harmonic models, fitted by this project from Environment Agency readings.
• Bridge headroom figures, level transfers and pilot requirements — everything in the app's obstacles.json — from Broads Authority publications and the project's own work.