Sources, dates and method · Open the map
These notices describe the saved data distributed with notbad. Source dates differ; a copyright year is not a promise of current coverage. Sources do not endorse the project.
© OpenStreetMap contributors. OpenStreetMap data is available under the Open Data Commons Open Database License (ODbL) 1.0. See openstreetmap.org/copyright for contributor and licensing information.
The notbad project makes its own database rights in the OSM-derived databases and OSM-derived parts listed below available under ODbL 1.0. This includes the derived walking topology, mapped destination selections, approach connections, track sections and exclusion data. You may obtain the complete distributed machine-readable derivatives without charge from the same public files used by the application:
/map/tiles/{z}/{x}/{y}.pbf, zooms 6–12, over bounds −0.65, 51.20, 0.40, 51.77. The machine-readable style records the local tile template, bounds and map attribution. This pack contains 209 tiles; the distributed tiles themselves are offered under ODbL 1.0 for their OSM-derived database rights.The gzip files decompress to JSON, GeoJSON or binary arrays. Binary integers/floats are little-endian. Graph offsets and neighbors are uint32; weights are Float32 distances in metres. The graph is stored as compressed sparse rows: each node's outgoing entries run from its offset to the next offset. Cell offsets/nodes are uint32; cell node references are one-based, and cell costs are uint16 decimetres. Coverage and Tube masks are uint8; missing-station-line flags are uint32. Cell arrays use row-major order. The walking manifest supplies counts, dimensions and line order; the base-grid manifest supplies the grid's west/north origin and step. Catalog JSON retains its destination/seed fields. These files are the complete distributed derivative, without a requirement to obtain the project's private working files.
The OSM snapshot for walking/destinations/tracks is 30 October 2026 at 21:24:51 UTC, supplied by Geofabrik; supplementary original way/node records are identified in track provenance. The separate basemap source is OpenFreeMap version 20261025_080012_pt. Public manifests retain source hashes and derivation evidence.
ODbL applies to the database rights described above. It does not replace the original licences of individual official-source contents, relicense application code, or grant rights to third-party brands. Retain the applicable notices when reusing a combined file. No additional restriction is placed on the ODbL rights granted here.
Open Government Licence v3.0 applies where identified below. Contains public sector information licensed under the Open Government Licence v3.0.
| Source and distributed data | Licence and attribution |
|---|---|
| Defra aircraft noise: manifest, day/night samples and overview grids. | OGL v3.0. © Department for Environment, Food & Rural Affairs copyright and/or database right 2024. |
Defra road and railway noise: local samples, overview grids and manifests under /data/noise/road/ and /data/noise/rail/. | OGL v3.0. © Department for Environment, Food & Rural Affairs copyright and/or database right 2023. Models use 2021 activity. |
| Greater London Authority / OS Open Data boundaries: boroughs, London boundary and derived London membership data. | Ordnance Survey Open Data. Contains public sector information licensed under OGL v3.0. The source geometry description refers to 2017. |
| TfL station, line and route information and cycle-permission facts. | TfL Transport Data Service licence, an amended OGL-2-based licence. Powered by TfL Open Data. Contains OS data © Crown copyright and database rights 2016 and Geomni UK Map data © and database rights 2019. These terms do not grant general rights to TfL logos, fonts or schematic artwork. |
| Metropolitan Police local crime, Metropolitan Police knife crime dashboard and Home Office: derived crime bands, manifest, zone data and provenance. | Open Government Licence. Met knife crime with injury, September 2025–August 2026. Contextual Metropolitan Police and City of London records, July 2024–June 2026. No individual incident records are distributed. |
| ONS: 2021 LSOA boundaries, 2026 ward lookup and mid-2024 population denominator, used in the crime derivatives. | Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026. |
| MHCLG, English indices of deprivation 2025: ancillary official LSOA-to-local-authority code lookup used to select London boundaries. | OGL v3.0, © Crown copyright. Only geography codes are used; deprivation ranks, scores and deciles are not app inputs. |
| DfE Get Information about Schools and Ofsted: establishment and inspection facts in school data. | OGL v3.0. DfE register dated 31 October 2026; Ofsted inspection snapshot dated 30 September 2026. Mapped approaches retain the separate OSM terms above. |
| OS Code-Point Open: August 2026 manifest and outward-code shards. | See the original supplied licence and full notices. Contains Ordnance Survey data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. |
Basemap processed by OpenFreeMap using OpenMapTiles. Positron derives from CartoDB Basemaps, designed by Stamen and Paul Norman for CartoDB. OpenFreeMap style code is MIT; Positron code is BSD 3-Clause, its design is CC BY 4.0 and upstream CartoDB design is CC BY 3.0. English label fields and local asset paths are adapted for this application.
Retained notices: OpenFreeMap and upstream assets, Positron / CartoDB / OpenMapTiles and Noto Sans, SIL Open Font License 1.1. The upstream sprite register identifies Maki icons as CC0 and the arrow as public domain. Natural Earth data is public domain; structured Wikidata data is CC0. Retain applicable font/style notices when redistributing those files.
Contour rendering software: d3-contour, d3-array and internmap are bundled locally under the ISC licence. Full copyright and licence notices.
Map rendering software: MapLibre GL JS is bundled locally with a source patch for nonblocking shader initialization under the BSD 3-Clause licence. Full copyright and licence notice.
Updated 7 November 2026. Provider download policies govern acquisition separately from data reuse licences. This notice records the project's licence grants and source credits; it does not guarantee source accuracy, current availability or publisher endorsement.