X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/2613ebfa0143cdd1e3220577d48d9aa8341dbf38..3be797c7595dec10812f16fd0ec778582d811fd4:/docs/api/Search.md

diff --git a/docs/api/Search.md b/docs/api/Search.md
index e166abaf..4b9d773c 100644
--- a/docs/api/Search.md
+++ b/docs/api/Search.md
@@ -1,123 +1,177 @@
+# Search queries
 
-## Search
-Nominatim indexes named (or numbered) features with the OSM data set and a subset of other unnamed features (pubs, hotels, churches, etc)
+The search API allows to look up a location from a textual description.
+Nominatim supports structured as well as free-form search queries.
 
-Search terms are processed first left to right and then right to left if that fails.
+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/).
 
-Both searches will work: [pilkington avenue, birmingham](//nominatim.openstreetmap.org/search?q=pilkington+avenue,birmingham), [birmingham, pilkington avenue](//nominatim.openstreetmap.org/search?q=birmingham,+pilkington+avenue)
+## Parameters
 
-(Commas are optional, but improve performance by reducing the complexity of the search.)
+The search API has the following two formats:
 
-Where house numbers have been defined for an area they should be used: [135 pilkington avenue, birmingham](//nominatim.openstreetmap.org/search?q=135+pilkington+avenue,+birmingham)
-
-### Special Keywords
-Various keywords are translated into searches for specific osm tags (e.g. Pub => amenity=pub).  A current list of [special phrases](https://wiki.openstreetmap.org/wiki/Nominatim/Special_Phrases) processed is available.
+```
+   https://nominatim.openstreetmap.org/search/<query>?<params>
+```
 
-### Parameters
+This format only accepts a free-form query string where the
+parts of the query are separated by slashes.
 
 ```
    https://nominatim.openstreetmap.org/search?<params>
-   https://nominatim.openstreetmap.org/search/<query>?<params>
 ```
 
-* `format=[html|xml|json|jsonv2]`
+In this form, the query may be given through two different sets of parameters:
+
+* `q=<query>`
+
+    Free-form query string to search for.
+    Free-form queries are processed first left-to-right and then right-to-left if that fails. So you may search for
+    [pilkington avenue, birmingham](//nominatim.openstreetmap.org/search?q=pilkington+avenue,birmingham) as well as for
+    [birmingham, pilkington avenue](//nominatim.openstreetmap.org/search?q=birmingham,+pilkington+avenue).
+    Commas are optional, but improve performance by reducing the complexity of the search.
+
+
+* `street=<housenumber> <streetname>`
+* `city=<city>`
+* `county=<county>`
+* `state=<state>`
+* `country=<country>`
+* `postalcode=<postalcode>`
 
-    * Output format
-    * defaults to `html`
+    Alternative query string format split into several parameters for structured requests.
+    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 paramters listed below.
+
+### Output format
+
+* `format=[html|xml|json|jsonv2|geojson|geocodejson]`
+
+See [Place Output Formats](Output.md) for details on each format. (Default: html)
 
 * `json_callback=<string>`
 
-    * Wrap json output in a callback function (JSONP) i.e. `<string>(<json>)` 
+Wrap json output in a callback function ([JSONP](https://en.wikipedia.org/wiki/JSONP)) i.e. `<string>(<json>)`.
+Only has an effect for JSON output formats.
 
-* `accept-language=<browser language string>`
+### Output details
+
+* `addressdetails=[0|1]`
 
-    * Preferred language order for showing search results, overrides the value specified in the "Accept-Language" HTTP header.
-    * Either uses standard rfc2616 accept-language string or a simple comma separated list of language codes.
+Include a breakdown of the address into elements. (Default: 0)
+
+
+* `extratags=[0|1]`
+
+Include additional information in the result if available,
+e.g. wikipedia link, opening hours. (Default: 0)
 
-* `q=<query>`
 
-    * Query string to search for.
-    * Alternatively can be entered as:
+* `namedetails=[0|1]`
 
-        * `street=<housenumber> <streetname>`
-        * `city=<city>`
-        * `county=<county>`
-        * `state=<state>`
-        * `country=<country>`
-        * `postalcode=<postalcode>`
-        
-      **(experimental)** Alternative query string format for structured requests. 
-Structured requests are faster and require fewer server resources. **Do not combine with `q=<query>` parameter**.
+Include a list of alternative names in the results. These may include
+language variants, references, operator and brand. (Default: 0)
+
+
+### Language of results
+
+* `accept-language=<browser language string>`
+
+Preferred language order for showing search results, overrides the value
+specified in the ["Accept-Language" HTTP header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language).
+Either use a standard RFC2616 accept-language string or a simple
+comma-separated list of language codes.
+
+### Result limitation
 
 * `countrycodes=<countrycode>[,<countrycode>][,<countrycode>]...`
 
-    * Limit search results to a specific country (or a list of countries).  
-    * `<countrycode>` should be the ISO 3166-1alpha2 code, e.g. `gb` for the United Kingdom, `de` for Germany, etc.
+Limit search results to one or more countries. `<countrycode>` must be the
+ISO 3166-1alpha2 code, e.g. `gb` for the United Kingdom, `de` for Germany.
+
+
+* `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).
+
+
+* `limit=<integer>`
+
+Limit the number of returned results. (Default: 10, Maximum: 50)
+
 
 * `viewbox=<x1>,<y1>,<x2>,<y2>`
-    * The preferred area to find search results. Any two corner points of the box are accepted in any order as long as they span a real box.
+
+The preferred area to find search results. Any two corner points of the box
+are accepted in any order as long as they span a real box.
+
 
 * `bounded=[0|1]`
-    * defaults to 0
-    * Restrict the results to only items contained with the viewbox (see above). 
-    * Restricting the results to the bounding box also enables searching by amenity only. 
-    * For example a search query of just `"[pub]"` would normally be rejected but with `bounded=1` will result in a list of items matching within the bounding box.
 
-* `polygon=[0|1]`
-    * defaults to 0
-    * Output polygon outlines for items found **(deprecated, use one of the polygon_* parameters instead)**
+When a viewbox is given, restrict the result to items contained with 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)
 
-* `addressdetails=[0|1]`
-    * defaults to 0
-    * Include a breakdown of the address into elements
 
-* `email=<valid email address>`
+### Polygon output
 
-    * If you are making large numbers of request please include a valid email address or alternatively include your email address as part of the User-Agent string.
-    * This information will be kept confidential and only used to contact you in the event of a problem, see [Usage Policy](https://operations.osmfoundation.org/policies/nominatim/) for more details.
+* `polygon_geojson=1`
+* `polygon_kml=1`
+* `polygon_svg=1`
+* `polygon_text=1`
 
-* `exclude_place_ids=<place_id,[place_id],[place_id]`
+Output geometry of results as a GeoJSON, KML, SVG or WKT. Only one of these
+options can be used at a time. (Default: 0)
 
-    * If you do not want certain openstreetmap 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)
+* `polygon_threshold=0.0`
 
-* `limit=<integer>`
-    * defaults to 10
-    * Limit the number of returned results.
+Simplify the output geometry before returning. 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)
+
+### Other
+
+* `email=<valid email address>`
+
+If you are making large numbers of request please include an appropriate email
+address to identify your requests. See Nominatim's [Usage Policy](https://operations.osmfoundation.org/policies/nominatim/) for more details.
 
 * `dedupe=[0|1]`
-    * defaults to 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 different OSM ways due to different characteristics. 
-    * Nominatim will attempt to detect such duplicates and only return one match; this is controlled by the dedupe parameter which defaults to 1. Since the limit is, for reasons of efficiency, enforced before and not after de-duplicating, it is possible that de-duplicating leaves you with less results than requested.
 
-* `debug=[0|1]`
-    * defaults to 0
-    * Output assorted developer debug information. Data on internals of nominatim "Search Loop" logic, and SQL queries. The output is (rough) HTML format. This overrides the specified machine readable format.
+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
+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)
 
-* `polygon_geojson=1`
-    * Output geometry of results in geojson format.
 
-* `polygon_kml=1`
-    * Output geometry of results in kml format.
 
-* `polygon_svg=1`
-    * Output geometry of results in svg format.
+* `debug=[0|1]`
+
+Output assorted developer debug information. Data on internals of Nominatim's
+"Search Loop" logic, and SQL queries. The output is (rough) HTML format.
+This overrides the specified machine readable format. (Default: 0)
 
-* `polygon_text=1`
-    * Output geometry of results as a WKT.
 
-* `extratags=1`
-    * Include additional information in the result if available, e.g. wikipedia link, opening hours.
 
-* `namedetails=1`
-    * Include a list of alternative names in the results.
-    * These may include language variants, references, operator and brand.
+## Examples
 
-### Examples
+
+##### XML with polygon points
 
 * [https://nominatim.openstreetmap.org/search?q=135+pilkington+avenue,+birmingham&format=xml&polygon=1&addressdetails=1](https://nominatim.openstreetmap.org/search?q=135+pilkington+avenue,+birmingham&format=xml&polygon=1&addressdetails=1)
-* [https://nominatim.openstreetmap.org/search/135%20pilkington%20avenue,%20birmingham?format=xml&polygon=1&addressdetails=1](https://nominatim.openstreetmap.org/search/135%20pilkington%20avenue,%20birmingham?format=xml&polygon=1&addressdetails=1)
 * [https://nominatim.openstreetmap.org/search/gb/birmingham/pilkington%20avenue/135?format=xml&polygon=1&addressdetails=1](https://nominatim.openstreetmap.org/search/gb/birmingham/pilkington%20avenue/135?format=xml&polygon=1&addressdetails=1)
+* [https://nominatim.openstreetmap.org/search/135%20pilkington%20avenue,%20birmingham?format=xml&polygon=1&addressdetails=1](https://nominatim.openstreetmap.org/search/135%20pilkington%20avenue,%20birmingham?format=xml&polygon=1&addressdetails=1)
 
 ```xml
   <searchresults timestamp="Sat, 07 Nov 09 14:42:10 +0000" querystring="135 pilkington, avenue birmingham" polygon="true">
@@ -141,7 +195,9 @@ Structured requests are faster and require fewer server resources. **Do not comb
   </searchresults>
 ```
 
-* [https://nominatim.openstreetmap.org/search/Unter%20den%20Linden%201%20Berlin?format=json&addressdetails=1&limit=1&polygon_svg=1](https://nominatim.openstreetmap.org/search/Unter%20den%20Linden%201%20Berlin?format=json&addressdetails=1&limit=1&polygon_svg=1)
+##### JSON with SVG polygon
+
+[https://nominatim.openstreetmap.org/search/Unter%20den%20Linden%201%20Berlin?format=json&addressdetails=1&limit=1&polygon_svg=1](https://nominatim.openstreetmap.org/search/Unter%20den%20Linden%201%20Berlin?format=json&addressdetails=1&limit=1&polygon_svg=1)
 
 ```json
     {
@@ -179,7 +235,9 @@ Structured requests are faster and require fewer server resources. **Do not comb
     }
 ```
 
-* [https://nominatim.openstreetmap.org/?format=json&addressdetails=1&q=bakery+in+berlin+wedding&format=json&limit=1](https://nominatim.openstreetmap.org/?format=json&addressdetails=1&q=bakery+in+berlin+wedding&format=json&limit=1)
+##### JSON with address details
+
+[https://nominatim.openstreetmap.org/?format=json&addressdetails=1&q=bakery+in+berlin+wedding&format=json&limit=1](https://nominatim.openstreetmap.org/?format=json&addressdetails=1&q=bakery+in+berlin+wedding&format=json&limit=1)
 
 ```json
     {
@@ -213,4 +271,79 @@ Structured requests are faster and require fewer server resources. **Do not comb
         "place_id": "1453068",
         "type": "bakery"
     }
-```
\ No newline at end of file
+```
+
+##### GeoJSON
+
+[https://nominatim.openstreetmap.org/search?q=17+Strada+Pictor+Alexandru+Romano%2C+Bukarest&format=geojson](https://nominatim.openstreetmap.org/search?q=17+Strada+Pictor+Alexandru+Romano%2C+Bukarest&format=geojson)
+
+```json
+{
+  "type": "FeatureCollection",
+  "licence": "Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright",
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {
+        "place_id": "35811445",
+        "osm_type": "node",
+        "osm_id": "2846295644",
+        "display_name": "17, Strada Pictor Alexandru Romano, Bukarest, Bucharest, Sector 2, Bucharest, 023964, Romania",
+        "place_rank": "30",
+        "category": "place",
+        "type": "house",
+        "importance": 0.62025
+      },
+      "bbox": [
+        26.1156689,
+        44.4354754,
+        26.1157689,
+        44.4355754
+      ],
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          26.1157189,
+          44.4355254
+        ]
+      }
+    }
+  ]
+}
+```
+
+##### GeocodeJSON
+
+[https://nominatim.openstreetmap.org/search?q=%CE%91%CE%B3%CE%AF%CE%B1+%CE%A4%CF%81%CE%B9%CE%AC%CE%B4%CE%B1%2C+%CE%91%CE%B4%CF%89%CE%BD%CE%B9%CE%B4%CE%BF%CF%82%2C+Athens%2C+Greece&format=geocodejson](https://nominatim.openstreetmap.org/search?q=%CE%91%CE%B3%CE%AF%CE%B1+%CE%A4%CF%81%CE%B9%CE%AC%CE%B4%CE%B1%2C+%CE%91%CE%B4%CF%89%CE%BD%CE%B9%CE%B4%CE%BF%CF%82%2C+Athens%2C+Greece&format=geocodejson)
+
+```json
+{
+  "type": "FeatureCollection",
+  "geocoding": {
+    "version": "0.1.0",
+    "attribution": "Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright",
+    "licence": "ODbL",
+    "query": "Αγία Τριάδα, Αδωνιδος, Athens, Greece"
+  },
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {
+        "geocoding": {
+          "type": "place_of_worship",
+          "label": "Αγία Τριάδα, Αδωνιδος, Άγιος Νικόλαος, 5º Δημοτικό Διαμέρισμα Αθηνών, Athens, Municipality of Athens, Regional Unit of Central Athens, Region of Attica, Attica, 11472, Greece",
+          "name": "Αγία Τριάδα",
+          "admin": null
+        }
+      },
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          23.72949633941,
+          38.0051697
+        ]
+      }
+    }
+  ]
+}
+```