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247 lines
9.7 KiB
Markdown
247 lines
9.7 KiB
Markdown
# Place Output
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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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## Formats
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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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```
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{
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"place_id": "100149",
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"licence": "Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright",
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"osm_type": "node",
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"osm_id": "107775",
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"boundingbox": ["51.3473219", "51.6673219", "-0.2876474", "0.0323526"],
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"lat": "51.5073219",
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"lon": "-0.1276474",
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"display_name": "London, Greater London, England, SW1A 2DU, United Kingdom",
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"class": "place",
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"type": "city",
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"importance": 0.9654895765402,
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"icon": "https://nominatim.openstreetmap.org/images/mapicons/poi_place_city.p.20.png",
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"address": {
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"city": "London",
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"state_district": "Greater London",
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"state": "England",
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"postcode": "SW1A 2DU",
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"country": "United Kingdom",
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"country_code": "gb"
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},
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"extratags": {
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"capital": "yes",
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"website": "http://www.london.gov.uk",
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"wikidata": "Q84",
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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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The possible fields are:
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* `place_id` - reference to the Nominatim internal database ID (see notes below)
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* `osm_type`, `osm_id` - reference to the OSM object
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* `boundingbox` - area of corner coordinates
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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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* `class`, `type` - key and value of the main OSM tag
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* `importance` - computed importance rank
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* `icon` - link to class icon (if available)
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* `address` - dictionary of address details (only with `addressdetails=1`)
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* `extratags` - dictionary with additional useful tags like website or maxspeed
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(only with `extratags=1`)
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* `namedetails` - dictionary with full list of available names including ref etc.
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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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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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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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* `place_id` - reference to the Nominatim internal database ID (see notes below)
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* `osm_type`, `osm_id` - reference to the OSM object
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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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* `importance` - computed importance rank
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* `icon` - link to class icon (if available)
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* `address` - dictionary of address details (only with `addressdetails=1`)
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* `extratags` - dictionary with additional useful tags like `website` or `maxspeed`
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(only with `extratags=1`)
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* `namedetails` - dictionary with full list of available names including ref etc.
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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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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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* `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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* `housenumber`, `street`, `locality`, `postcode`, `city`,
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`district`, `county`, `state`, `country` -
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provided when it can be determined from the address
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(see [this issue](https://github.com/openstreetmap/Nominatim/issues/1080) for
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current limitations on the correctness of the address) and `addressdetails=1`
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was given
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* `admin` - list of localised names of administrative boundaries (only with `addressdetails=1`)
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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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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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```
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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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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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</result>
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<addressparts>
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<state>Bavaria</state>
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<country>Germany</country>
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<country_code>de</country_code>
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</addressparts>
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<extratags>
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<tag key="place" value="state"/>
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<tag key="wikidata" value="Q980"/>
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<tag key="wikipedia" value="de:Bayern"/>
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<tag key="population" value="12520000"/>
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<tag key="name:prefix" value="Freistaat"/>
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</extratags>
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</reversegeocode>
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```
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The attributes of the outer `reversegeocode` element return generic information
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about the query, including the time when the response was sent (in UTC),
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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 below)
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* `osm_type`, `osm_id` - reference to the OSM object
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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
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The full address of the result can be found in the content of the
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`result` element as a comma-separated list.
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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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```
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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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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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icon="https://nominatim.openstreetmap.org/images/mapicons/poi_place_city.p.20.png">
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<extratags>
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<tag key="capital" value="yes"/>
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<tag key="website" value="http://www.london.gov.uk"/>
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<tag key="wikidata" value="Q84"/>
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<tag key="wikipedia" value="en:London"/>
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<tag key="population" value="8416535"/>
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</extratags>
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<city>London</city>
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<state_district>Greater London</state_district>
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<state>England</state>
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<postcode>SW1A 2DU</postcode>
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<country>United Kingdom</country>
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<country_code>gb</country_code>
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</place>
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</searchresults>
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```
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The attributes of the outer `searchresults` or `lookupresults` element return
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generic information about the query:
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* `timestamp` - UTC time when the response was sent
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* `attribution` - OSM licensing information
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* `querystring` - original query
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* `polygon` - true when extra geometry information was requested
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* `exclude_place_ids` - IDs of places that should be ignored in a follow-up request
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* `more_url` - search call that will yield additional results for the query
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just sent
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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 below)
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* `osm_type`, `osm_id` - reference to the OSM object
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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
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* `place_rank` - class search 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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* `icon` - link to class icon (if available)
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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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## 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 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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get a new `osm_id`), there is no link between those old and new ids.
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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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### 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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