Safety and accessibility of the environment
Safety and accessibility of the urban environment: hydrants and gaps in their coverage, surveillance cameras, barriers, speed limits, an accident-risk estimate and an accessibility audit for people with reduced mobility. The estimates are built from OSM tagging — this is neither police data nor a field survey.
Tools in this group: 6
Accessibility audit
accessibility-audit
Checks which points of interest and buildings carry wheelchair accessibility tags and shows the gaps. This is an audit of OSM tags, not a field survey.
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No extra parameters — the bounding box is enough for this tool.
Accident risk estimate
accident-risk
A model estimate of risk from the complexity of the road network and the density of intersections. No data on actual crashes enters the computation.
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No extra parameters — the bounding box is enough for this tool.
Barriers and fences
barrier-analysis
Exports fences, walls, gates and bollards — the obstacles to passage on foot and by vehicle.
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No extra parameters — the bounding box is enough for this tool.
Fire hydrants
fire-hydrant
Exports hydrants and shows the gaps in coverage for a given service radius.
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Speed limits
speed-limit
Breaks roads down by the value of maxspeed and shows the distribution of the limits.
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No extra parameters — the bounding box is enough for this tool.
Surveillance cameras
surveillance
Exports the CCTV cameras marked in OSM and estimates their density.
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No extra parameters — the bounding box is enough for this tool.
Input, output and limits
The input is a rectangular bounding box in WGS84 plus one of nine data layers; some tools also take a point. The output is GeoJSON, JSON metrics or a GeoTIFF.
| Layer | What it holds |
|---|---|
| buildings | buildings |
| roads | roads and streets |
| poi | points of interest: services, shops, tourism |
| water | water bodies |
| green_areas | green areas: parks, forests, lawns |
| railways | railways |
| boundaries | administrative boundaries |
| landuse | land use |
| waterways | waterways |
Every tool in the section is free. The bounding box may cover up to 100 km². Rate limits are 10 requests per minute per tool run and 30 requests per minute for reading the catalogue. Without signing in you get up to 10 successful calculations a day; after that the service asks you to register and answers 402 with the code login_required. A box larger than the allowed area is also 402, and an unknown tool id is 404.