mirror of
https://github.com/osm-search/Nominatim.git
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update API documentation
* remove traces of HTML output * add details on artificial objects (see also #1671) * add geometry output documentation for lookup * deprecate query by ID via reverse endpoint * remove /search/<query> query format, no longer supported * explain better what reverse geocoding does * lots of smaller fixes to wording
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Sarah Hoffmann
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@ -1,19 +1,22 @@
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# Place details
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Lookup details about a single place by id. The default output is HTML for debugging search logic and results.
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Show all details about a single place saved in the database.
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**The details page (including JSON output) exists for debugging only and must not be downloaded automatically**, see [Nominatim Usage Policy](https://operations.osmfoundation.org/policies/nominatim/).
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!!! warning
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The details page exists for debugging only. You may not use it in scripts
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or to automatically query details about a result.
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See [Nominatim Usage Policy](https://operations.osmfoundation.org/policies/nominatim/).
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## Parameters
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The details API supports the following two request formats:
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```
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https://nominatim.openstreetmap.org/details?osmtype=[N|W|R]&osmid=<value>&class=<value>
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``` xml
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https://nominatim.openstreetmap.org/details?osmtype=[N|W|R]&osmid=<value>&class=<value>
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```
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`osmtype` and `osmid` are required parameter. The type is one of node (N), way (W)
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`osmtype` and `osmid` are required parameters. The type is one of node (N), way (W)
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or relation (R). The id must be a number. The `class` parameter is optional and
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allows to distinguish between entries, when the corresponding OSM object has more
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than one main tag. For example, when a place is tagged with `tourism=hotel` and
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@ -23,36 +26,34 @@ to get exactly the one you want. If there are multiple places in the database
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but the `class` parameter is left out, then one of the places will be chosen
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at random and displayed.
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```
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https://nominatim.openstreetmap.org/details?place_id=<value>
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``` xml
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https://nominatim.openstreetmap.org/details?place_id=<value>
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```
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Placeids are assigned sequentially during Nominatim data import. The id for a place is different between Nominatim installation (servers) and changes when data gets reimported. Therefore it can't be used as permanent id and shouldn't be used in bug reports.
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Place IDs are assigned sequentially during Nominatim data import. The ID
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for a place is different between Nominatim installation (servers) and
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changes when data gets reimported. Therefore it cannot be used as
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a permanent id and shouldn't be used in bug reports.
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Additional optional parameters are explained below.
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### Output format
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* `format=[html|json]`
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See [Place Output Formats](Output.md) for details on each format. (Default: html)
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* `json_callback=<string>`
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Wrap JSON output in a callback function (JSONP) i.e. `<string>(<json>)`.
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Only has an effect for JSON output formats.
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* `pretty=[0|1]`
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For JSON output will add indentation to make it more human-readable. (Default: 0)
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Add indentation to make it more human-readable. (Default: 0)
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### Output details
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* `addressdetails=[0|1]`
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Include a breakdown of the address into elements. (Default for JSON: 0, for HTML: 1)
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Include a breakdown of the address into elements. (Default: 0)
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* `keywords=[0|1]`
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@ -60,11 +61,16 @@ Include a list of name keywords and address keywords (word ids). (Default: 0)
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* `linkedplaces=[0|1]`
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Include details of places higher in the address hierarchy. E.g. for a street this is usually the city, state, postal code, country. (Default: 1)
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Include a details of places that are linked with this one. Places get linked
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together when they are different forms of the same physical object. Nominatim
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links two kinds of objects together: place nodes get linked with the
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corresponding administrative boundaries. Waterway relations get linked together with their
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members.
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(Default: 1)
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* `hierarchy=[0|1]`
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Include details of places lower in the address hierarchy. E.g. for a city this usually a list of streets, suburbs, rivers. (Default for JSON: 0, for HTML: 1)
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Include details of places lower in the address hierarchy. . (Default: 0)
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* `group_hierarchy=[0|1]`
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@ -72,7 +78,7 @@ For JSON output will group the places by type. (Default: 0)
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* `polygon_geojson=[0|1]`
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Include geometry of result. (Default for JSON: 0, for HTML: 1)
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Include geometry of result. (Default: 0)
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### Language of results
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@ -86,10 +92,6 @@ comma-separated list of language codes.
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## Examples
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##### HTML
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[https://nominatim.openstreetmap.org/details.php?osmtype=W&osmid=38210407](https://nominatim.openstreetmap.org/details.php?osmtype=W&osmid=38210407)
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##### JSON
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[https://nominatim.openstreetmap.org/details.php?osmtype=W&osmid=38210407&format=json](https://nominatim.openstreetmap.org/details.php?osmtype=W&osmid=38210407&format=json)
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@ -56,6 +56,21 @@ specified in the "Accept-Language" HTTP header.
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Either use a standard RFC2616 accept-language string or a simple
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comma-separated list of language codes.
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### Polygon output
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* `polygon_geojson=1`
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* `polygon_kml=1`
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* `polygon_svg=1`
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* `polygon_text=1`
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Output geometry of results as a GeoJSON, KML, SVG or WKT. Only one of these
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options can be used at a time. (Default: 0)
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* `polygon_threshold=0.0`
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Return a simplified version of the output geometry. The parameter is the
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tolerance in degrees with which the geometry may differ from the original
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geometry. Topology is preserved in the result. (Default: 0.0)
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### Other
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@ -2,12 +2,10 @@
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The [/reverse](Reverse.md), [/search](Search.md) and [/lookup](Lookup.md)
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API calls produce very similar output which is explained in this section.
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There is one section for each format which is selectable via the `format`
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parameter.
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There is one section for each format. The format correspond to what was
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selected via the `format` parameter.
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## Formats
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### JSON
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## JSON
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The JSON format returns an array of places (for search and lookup) or
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a single place (for reverse) of the following format:
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@ -41,13 +39,13 @@ a single place (for reverse) of the following format:
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"wikipedia": "en:London",
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"population": "8416535"
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}
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},
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}
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```
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The possible fields are:
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* `place_id` - reference to the Nominatim internal database ID ([see notes](#place_id-is-not-a-persistent-id))
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* `osm_type`, `osm_id` - reference to the OSM object
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* `osm_type`, `osm_id` - reference to the OSM object ([see notes](#osm-reference))
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* `boundingbox` - area of corner coordinates ([see notes](#boundingbox))
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* `lat`, `lon` - latitude and longitude of the centroid of the object
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* `display_name` - full comma-separated address
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@ -62,22 +60,22 @@ The possible fields are:
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* `geojson`, `svg`, `geotext`, `geokml` - full geometry
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(only with the appropriate `polygon_*` parameter)
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### JSONv2
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## JSONv2
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This is the same as the JSON format with two changes:
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* `class` renamed to `category`
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* additional field `place_rank` with the search rank of the object
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### GeoJSON
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## GeoJSON
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This format follows the [RFC7946](https://geojson.org). Every feature includes
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a bounding box (`bbox`).
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The feature list has the following fields:
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The properties object has the following fields:
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* `place_id` - reference to the Nominatim internal database ID ([see notes](#place_id-is-not-a-persistent-id))
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* `osm_type`, `osm_id` - reference to the OSM object
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* `osm_type`, `osm_id` - reference to the OSM object ([see notes](#osm-reference))
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* `category`, `type` - key and value of the main OSM tag
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* `display_name` - full comma-separated address
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* `place_rank` - class search rank
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@ -92,13 +90,13 @@ The feature list has the following fields:
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Use `polygon_geojson` to output the full geometry of the object instead
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of the centroid.
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### GeocodeJSON
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## GeocodeJSON
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The GeocodeJSON format follows the
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[GeocodeJSON spec 0.1.0](https://github.com/geocoders/geocodejson-spec).
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The following feature attributes are implemented:
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* `osm_type`, `osm_id` - reference to the OSM object (unofficial extension)
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* `osm_type`, `osm_id` - reference to the OSM object (unofficial extension, [see notes](#osm-reference))
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* `type` - value of the main tag of the object (e.g. residential, restaurant, ...)
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* `label` - full comma-separated address
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* `name` - localised name of the place
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@ -110,18 +108,18 @@ The following feature attributes are implemented:
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Use `polygon_geojson` to output the full geometry of the object instead
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of the centroid.
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### XML
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## XML
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The XML response returns one or more place objects in slightly different
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formats depending on the API call.
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#### Reverse
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### Reverse
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```
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<reversegeocode timestamp="Sat, 11 Aug 18 11:53:21 +0000"
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attribution="Data © OpenStreetMap contributors, ODbL 1.0. https://www.openstreetmap.org/copyright"
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querystring="lat=48.400381&lon=11.745876&zoom=5&format=xml">
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<result place_id="179509537" osm_type="relation" osm_id="2145268" ref="BY"
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<result place_id="179509537" osm_type="relation" osm_id="2145268" ref="BY" place_rank="15" address_rank="15"
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lat="48.9467562" lon="11.4038717"
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boundingbox="47.2701114,50.5647142,8.9763497,13.8396373">
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Bavaria, Germany
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@ -148,7 +146,7 @@ attribution to OSM and the original querystring.
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The place information can be found in the `result` element. The attributes of that element contain:
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* `place_id` - reference to the Nominatim internal database ID ([see notes](#place_id-is-not-a-persistent-id))
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* `osm_type`, `osm_id` - reference to the OSM object
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* `osm_type`, `osm_id` - reference to the OSM object ([see notes](#osm-reference))
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* `ref` - content of `ref` tag if it exists
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* `lat`, `lon` - latitude and longitude of the centroid of the object
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* `boundingbox` - comma-separated list of corner coordinates ([see notes](#boundingbox))
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@ -159,14 +157,14 @@ The full address of the result can be found in the content of the
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Additional information requested with `addressdetails=1`, `extratags=1` and
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`namedetails=1` can be found in extra elements.
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#### Search and Lookup
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### Search and Lookup
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```
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<searchresults timestamp="Sat, 11 Aug 18 11:55:35 +0000"
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attribution="Data © OpenStreetMap contributors, ODbL 1.0. https://www.openstreetmap.org/copyright"
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querystring="london" polygon="false" exclude_place_ids="100149"
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more_url="https://nominatim.openstreetmap.org/search.php?q=london&addressdetails=1&extratags=1&exclude_place_ids=100149&format=xml&accept-language=en-US%2Cen%3Bq%3D0.7%2Cde%3Bq%3D0.3">
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<place place_id="100149" osm_type="node" osm_id="107775" place_rank="15"
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<place place_id="100149" osm_type="node" osm_id="107775" place_rank="15" address_rank="15"
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boundingbox="51.3473219,51.6673219,-0.2876474,0.0323526" lat="51.5073219" lon="-0.1276474"
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display_name="London, Greater London, England, SW1A 2DU, United Kingdom"
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class="place" type="city" importance="0.9654895765402"
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@ -203,11 +201,12 @@ The place information can be found in the `place` elements, of which there may
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be more than one. The attributes of that element contain:
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* `place_id` - reference to the Nominatim internal database ID ([see notes](#place_id-is-not-a-persistent-id))
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* `osm_type`, `osm_id` - reference to the OSM object
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* `osm_type`, `osm_id` - reference to the OSM object ([see notes](#osm-reference))
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* `ref` - content of `ref` tag if it exists
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* `lat`, `lon` - latitude and longitude of the centroid of the object
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* `boundingbox` - comma-separated list of corner coordinates ([see notes](#boundingbox))
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* `place_rank` - class search rank
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* `place_rank` - class [search rank](../develop/Ranking#search-rank)
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* `address_rank` - place [address rank](../develop/Ranking#address-rank)
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* `display_name` - full comma-separated address
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* `class`, `type` - key and value of the main OSM tag
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* `importance` - computed importance rank
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@ -217,17 +216,19 @@ When `addressdetails=1` is requested, the localised address parts appear
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as subelements with the type of the address part.
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Additional information requested with `extratags=1` and `namedetails=1` can
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be found in extra elements as sub-element of each place.
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be found in extra elements as sub-element of `extratags` and `namedetails`
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respectively.
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## Notes on field values
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### place_id is not a persistent id
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The `place_id` is created when a Nominatim database gets installed. A
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single place will have a different value on another server or even when
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the same data gets re-imported. It's thus not useful to treat it as
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permanent for later use.
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The `place_id` is an internal identifier that is assigned data is imported
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into a Nominatim database. The same OSM object will have a different value
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on another server. It may even change its ID on the same server when it is
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removed and reimported while updating the database with fresh OSM data.
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It is thus not useful to treat it as permanent for later use.
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The combination `osm_type`+`osm_id` is slighly better but remember in
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OpenStreetMap mappers can delete, split, recreate places (and those
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@ -236,20 +237,40 @@ Places can also change their meaning without changing their `osm_id`,
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e.g. when a restaurant is retagged as supermarket. For a more in-depth
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discussion see [Permanent ID](https://wiki.openstreetmap.org/wiki/Permanent_ID).
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Nominatim merges some places (e.g. center node of a city with the boundary
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relation) so `osm_type`+`osm_id`+`class_name` would be more unique.
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If you need an ID that is consistent over multiple installations of Nominatim,
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then you should use the combination of `osm_type`+`osm_id`+`class`.
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### OSM reference
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Nominatim may sometimes return special objects that do not correspond directly
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to an object in OpenStreetMap. These are:
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* **Postcodes**. Nominatim returns an postcode point created from all mapped
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postcodes of the same name. The class and type of these object is `place=postcdode`.
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No `osm_type` and `osm_id` are included in the result.
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* **Housenumber interpolations**. Nominatim returns a single interpolated
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housenumber from the interpolation way. The class and type are `place=house`
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and `osm_type` and `osm_id` correspond to the interpolation way in OSM.
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* **TIGER housenumber.** Nominatim returns a single interpolated housenumber
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from the TIGER data. The class and type are `place=house`
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and `osm_type` and `osm_id` correspond to the street mentioned in the result.
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Please note that the `osm_type` and `osm_id` returned may be changed in the
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future. You should not expect to only find `node`, `way` and `relation` for
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the type.
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### boundingbox
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Comma separated list of min latitude, max latitude, min longitude, max longitude.
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The whole planet would be `-90,90,-180,180`.
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Can we used to pan and center the map on the result, for example with leafletjs
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Can be used to pan and center the map on the result, for example with leafletjs
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mapping library
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`map.fitBounds([[bbox[0],bbox[2]],[bbox[1],bbox[3]]], {padding: [20, 20], maxzoom: 16});`
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Bounds crossing the antimeridian have a min latitude -180 and max latitude 180,
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essentially covering the planet (See [issue 184](https://github.com/openstreetmap/Nominatim/issues/184)).
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essentially covering the entire planet
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(see [issue 184](https://github.com/openstreetmap/Nominatim/issues/184)).
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### addressdetails
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@ -1,36 +1,48 @@
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# Reverse Geocoding
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Reverse geocoding generates an address from a latitude and longitude or from
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an OSM object.
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Reverse geocoding generates an address from a latitude and longitude.
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## How it works
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The reveser geocoding API does not exactly compute the address for the
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coordinate it receives. It works by finding the closest suitable OSM object
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and returning its address information. This may occasionally lead to
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unexpected results.
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First of all, Nominatim only includes OSM objects in
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its index that are suitable for searching. Small, unnamed paths for example
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are missing from the database and can therefore not be used for reverse
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geocoding either.
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The other issue to be aware of is that the closest OSM object may not always
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have a similar enough address to the coordinate you were requesting. For
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example, in dense city areas it may belong to a completely different street.
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## Parameters
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The main format of the reverse API is
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```
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https://nominatim.openstreetmap.org/reverse?<query>
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https://nominatim.openstreetmap.org/reverse?lat=<value>&lon=<value>&<params>
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```
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There are two ways how the requested location can be specified:
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where `lat` and `lon` are latitude and longitutde of a coordinare in WGS84
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projection. The API returns exactly one result or an error when the coordinate
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is in an area with no OSM data coverage.
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* `lat=<value>` `lon=<value>`
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Additional paramters are accepted as listed below.
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A geographic location to generate an address for. The coordiantes must be
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in WGS84 format.
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* `osm_type=[N|W|R]` `osm_id=<value>`
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A specific OSM node(N), way(W) or relation(R) to return an address for.
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In both cases exactly one object is returned. The two input parameters cannot
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be used at the same time. Both accept the additional optional parameters listed
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below.
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!!! warning "Deprecation warning"
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The reverse API used to allow address lookup for a single OSM object by
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its OSM id. This use is now deprecated. Use the [Address Lookup API](../Lookup)
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instead.
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### Output format
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* `format=[xml|json|jsonv2|geojson|geocodejson]`
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|
||||
See [Place Output Formats](Output.md) for details on each format. (Default: html)
|
||||
See [Place Output Formats](Output.md) for details on each format. (Default: xml)
|
||||
|
||||
* `json_callback=<string>`
|
||||
|
||||
@ -69,8 +81,9 @@ comma-separated list of language codes.
|
||||
|
||||
* `zoom=[0-18]`
|
||||
|
||||
Level of detail required for the address. Default: 18. This is a number that corresponds
|
||||
roughly to the zoom level used in map frameworks like Leaflet.js, Openlayers etc.
|
||||
Level of detail required for the address. Default: 18. This is a number that
|
||||
corresponds roughly to the zoom level used in XYZ tile sources in frameworks
|
||||
like Leaflet.js, Openlayers etc.
|
||||
In terms of address details the zoom levels are as follows:
|
||||
|
||||
zoom | address detail
|
||||
@ -97,7 +110,7 @@ options can be used at a time. (Default: 0)
|
||||
|
||||
* `polygon_threshold=0.0`
|
||||
|
||||
Simplify the output geometry before returning. The parameter is the
|
||||
Return a simplified version of the output geometry. The parameter is the
|
||||
tolerance in degrees with which the geometry may differ from the original
|
||||
geometry. Topology is preserved in the result. (Default: 0.0)
|
||||
|
||||
|
||||
@ -1,30 +1,27 @@
|
||||
# Search queries
|
||||
|
||||
The search API allows you to look up a location from a textual description.
|
||||
Nominatim supports structured as well as free-form search queries.
|
||||
The search API allows you to look up a location from a textual description
|
||||
or address. Nominatim supports structured and free-form search queries.
|
||||
|
||||
The search query may also contain
|
||||
[special phrases](https://wiki.openstreetmap.org/wiki/Nominatim/Special_Phrases)
|
||||
which are translated into specific OpenStreetMap (OSM) tags (e.g. Pub => `amenity=pub`).
|
||||
Note that this only limits the items to be found, it's not suited to return complete
|
||||
lists of OSM objects of a specific type. For those use [Overpass API](https://overpass-api.de/).
|
||||
This can be used to narrow down the kind of objects to be returned.
|
||||
|
||||
!!! warning
|
||||
Special phrases are not suitable to query all objects of a certain type in an
|
||||
area. Nominatim will always just return a collection of the best matches. To
|
||||
download OSM data by object type, use the [Overpass API](https://overpass-api.de/).
|
||||
|
||||
## Parameters
|
||||
|
||||
The search API has the following two formats:
|
||||
|
||||
```
|
||||
https://nominatim.openstreetmap.org/search/<query>?<params>
|
||||
```
|
||||
|
||||
This format only accepts a free-form query string where the
|
||||
parts of the query are separated by slashes.
|
||||
The search API has the following format:
|
||||
|
||||
```
|
||||
https://nominatim.openstreetmap.org/search?<params>
|
||||
```
|
||||
|
||||
In this form, the query may be given through two different sets of parameters:
|
||||
The search term may be specified with two different sets of parameters:
|
||||
|
||||
* `q=<query>`
|
||||
|
||||
@ -46,13 +43,13 @@ In this form, the query may be given through two different sets of parameters:
|
||||
Structured requests are faster but are less robust against alternative
|
||||
OSM tagging schemas. **Do not combine with** `q=<query>` **parameter**.
|
||||
|
||||
All three query forms accept the additional parameters listed below.
|
||||
Both query forms accept the additional parameters listed below.
|
||||
|
||||
### Output format
|
||||
|
||||
* `format=[html|xml|json|jsonv2|geojson|geocodejson]`
|
||||
* `format=[xml|json|jsonv2|geojson|geocodejson]`
|
||||
|
||||
See [Place Output Formats](Output.md) for details on each format. (Default: html)
|
||||
See [Place Output Formats](Output.md) for details on each format. (Default: jsonv2)
|
||||
|
||||
* `json_callback=<string>`
|
||||
|
||||
@ -96,16 +93,16 @@ Limit search results to one or more countries. `<countrycode>` must be the
|
||||
e.g. `gb` for the United Kingdom, `de` for Germany.
|
||||
|
||||
Each place in Nominatim is assigned to one country code based
|
||||
on `admin_level=2` tags, in rare cases to none (for example in
|
||||
international waters outside any country).
|
||||
on OSM country boundaries. In rare cases a place may not be in any country
|
||||
at all, for example, in international waters.
|
||||
|
||||
* `exclude_place_ids=<place_id,[place_id],[place_id]`
|
||||
|
||||
If you do not want certain OSM objects to appear in the search
|
||||
result, give a comma separated list of the `place_id`s you want to skip.
|
||||
This can be used to broaden search results. For example, if a previous
|
||||
query only returned a few results, then including those here would cause
|
||||
the search to return other, less accurate, matches (if possible).
|
||||
This can be used to retrieve additional search results. For example, if a
|
||||
previous query only returned a few results, then including those here would
|
||||
cause the search to return other, less accurate, matches (if possible).
|
||||
|
||||
|
||||
* `limit=<integer>`
|
||||
@ -122,10 +119,11 @@ are accepted as long as they span a real box. `x` is longitude,
|
||||
|
||||
* `bounded=[0|1]`
|
||||
|
||||
When a viewbox is given, restrict the result to items contained with that
|
||||
When a viewbox is given, restrict the result to items contained within that
|
||||
viewbox (see above). When `viewbox` and `bounded=1` are given, an amenity
|
||||
only search is allowed. In this case, give the special keyword for the
|
||||
amenity in square brackets, e.g. `[pub]`. (Default: 0)
|
||||
only search is allowed. Give the special keyword for the amenity in square
|
||||
brackets, e.g. `[pub]` and a selection of objects of this type is returned.
|
||||
There is no guarantee that the result is complete. (Default: 0)
|
||||
|
||||
|
||||
### Polygon output
|
||||
@ -140,7 +138,7 @@ options can be used at a time. (Default: 0)
|
||||
|
||||
* `polygon_threshold=0.0`
|
||||
|
||||
Simplify the output geometry before returning. The parameter is the
|
||||
Return a simplified version of the output geometry. The parameter is the
|
||||
tolerance in degrees with which the geometry may differ from the original
|
||||
geometry. Topology is preserved in the result. (Default: 0.0)
|
||||
|
||||
@ -154,13 +152,11 @@ address to identify your requests. See Nominatim's [Usage Policy](https://operat
|
||||
* `dedupe=[0|1]`
|
||||
|
||||
Sometimes you have several objects in OSM identifying the same place or
|
||||
object in reality. The simplest case is a street being split in many
|
||||
object in reality. The simplest case is a street being split into many
|
||||
different OSM ways due to different characteristics. Nominatim will
|
||||
attempt to detect such duplicates and only return one match unless
|
||||
this parameter is set to 0. (Default: 1)
|
||||
|
||||
|
||||
|
||||
* `debug=[0|1]`
|
||||
|
||||
Output assorted developer debug information. Data on internals of Nominatim's
|
||||
|
||||
Loading…
Reference in New Issue
Block a user