Infrastructure near a point
infrastructure_atRead-onlyIdempotent
Find infrastructure near a point, sorted by distance, and filter by type to highlight bridges, towers, or piers amid common street furniture.
Instructions
Infrastructure near a point, nearest first: bridges, towers, piers — and street furniture.
From Overture's base theme (issue #179), type=infrastructure — the
built things that are neither buildings nor POIs. Read the data
honestly before trusting an answer: this layer is dominated by street
furniture (street_lamp, bench, waste_basket, bollard, kerb, crossing),
which outnumbers landmark infrastructure roughly 50:1 in a city
centre. An unfiltered query in a dense area returns lamps and benches
and says nothing about whether a bridge is nearby. To ask about
landmarks, filter: subtype/infra_class match Overture's `subtype` and
`class` columns (case-insensitive substring; infra_class is `class`
under a non-reserved name) — e.g. subtype="bridge", subtype="tower",
subtype="power", infra_class="pier".
Returns {"center", "radius_m", "results": [{"id", "subtype", "class",
"name", "distance_m"}, ...]}, plus "truncated": true, "total_in_range"
and an explanatory "note" whenever more features matched than were
returned. id is the GERS id, usable with other GERS-keyed tools. No raw
geometry (design rule: answers, not data).
Radius search, not containment: most infrastructure is linear or a
bare point, so "what's within radius_m" is the answerable question.
distance_m is measured to the closest point on the feature, not its
centroid — a bridge you are standing on reads ~0 m, not "distance to
the middle of the bridge". radius_m echoes the effective radius, which
may be lower than requested (large values are clamped).
An empty results list is a valid answer, not an error: base-theme
coverage is OSM-derived and patchy, and "no infrastructure within
500 m" is a real finding. Returns a structured {"error": ...} if
upstream is unavailable or the dataset is missing geometry/bbox, and
{"error": "bad_request"} for a non-finite or out-of-range coordinate.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| lat | Yes | ||
| lon | Yes | ||
| limit | No | ||
| subtype | No | ||
| radius_m | No | ||
| infra_class | No |
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||