307 lines
7.5 KiB
Markdown
307 lines
7.5 KiB
Markdown
# Geocoding Functions
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The following geocoding functions are available, grouped by categories.
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## Country geocoder
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This function provides a country geocoding service. It recognizes the names of the different countries from different synonyms, such as their English name, their endonym, or their ISO2 or ISO3 codes.
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### cdb_geocode_admin0_polygon(_country_name text_)
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#### Arguments
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Name | Type | Description
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--- | --- | ---
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`country_name` | `text` | Name of the country
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#### Returns
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Geometry (polygon, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_admin0_polygon('France')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_admin0_polygon({country_column})
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```
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## Level-1 Administrative regions geocoder
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The following functions provide a geocoding service for administrative regions of level 1 (or NUTS-1) such as states for the United States, regions in France or autonomous communities in Spain.
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### cdb_geocode_admin1_polygon(_admin1_name text_)
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#### Arguments
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Name | Type | Description
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--- | --- | ---
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`admin1_name` | `text` | Name of the province/state
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#### Returns
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Geometry (polygon, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_admin1_polygon('Alicante')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_admin1_polygon({province_column})
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```
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### cdb_geocode_admin1_polygon(_admin1_name text, country_name text_)
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#### Arguments
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Name | Type | Description
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--- | --- | ---
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`admin1_name` | `text` | Name of the province/state
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`country_name` | `text` | Name of the country in which the province/state is located
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#### Returns
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Geometry (polygon, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_admin1_polygon('Alicante', 'Spain')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_admin1_polygon({province_column}, {country_column})
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```
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## City geocoder
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The following functions provide a city geocoder service. It is recommended to use the more specific geocoding function -- the one that requires more parameters — in order for the result to be as accurate as possible when several cities share their name.
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### cdb_geocode_namedplace_point(_city_name text_)
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#### Arguments
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Name | Type | Description
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--- | --- | ---
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`city_name` | `text` | Name of the city
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#### Returns
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Geometry (point, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_namedplace_point('Barcelona')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_namedplace_point({city_column})
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```
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### cdb_geocode_namedplace_point(_city_name text, country_name text_)
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#### Arguments
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Name | Type | Description
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--- | --- | ---
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`city_name` | `text` | Name of the city
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`country_name` | `text` | Name of the country in which the city is located
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#### Returns
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Geometry (point, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_namedplace_point('Barcelona', 'Spain')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_namedplace_point({city_column}, 'Spain')
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```
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### cdb_geocode_namedplace_point(_city_name text, admin1_name text, country_name text_)
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#### Arguments
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Name | Type | Description
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--- | --- | ---
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`city_name` | `text` | Name of the city
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`admin1_name` | `text` | Name of the province/state in which the city is located
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`country_name` | `text` | Name of the country in which the city is located
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#### Returns
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Geometry (point, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_namedplace_point('New York', 'New York', 'USA')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_namedplace_point({city_column}, {province_column}, 'USA')
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```
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## Postal codes geocoder
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The following functions provide a postal code geocoding service that can be used to obtain points or polygon results. The postal code polygon geocoder covers the United States, France, Australia and Canada; a request for a different country will return an empty response.
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**Note:** For the USA, US Census [Zip Code Tabulation Areas](https://www.census.gov/geo/reference/zctas.html) (ZCTA) are used to reference geocodes for USPS postal codes service areas. See the [FAQs](http://docs.cartodb.com/faqs/datasets-and-data/#why-does-cartodb-use-census-bureau-zctas-and-not-usps-zip-codes-for-postal-codes) about datasets and data for details.
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### cdb_geocode_postalcode_polygon(_postal_code text, country_name text_)
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#### Arguments
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Name | Type | Description
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--- | --- | ---
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`postal_code` | `text` | Postal code
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`country_name` | `text` | Name of the country in which the postal code is located
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#### Returns
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Geometry (polygon, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_postalcode_polygon('11211', 'USA')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_postalcode_polygon({postal_code_column}, 'USA')
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```
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### cdb_geocode_postalcode_point(_code text, country_name text_)
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#### Arguments
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Name | Type | Description
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--- | --- | ---
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`postal_code` | `text` | Postal code
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`country_name` | `text` | Name of the country in which the postal code is located
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#### Returns
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Geometry (point, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_postalcode_point('11211', 'USA')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_postalcode_point({postal_code_column}, 'USA')
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```
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## IP addresses geocoder
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This function provides an IP address geocoding service, for both IPv4 and IPv6 addresses.
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### cdb_geocode_ipaddress_point(_ip_address text_)
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#### Arguments
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Name | Type | Description
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--- | --- | ---
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`ip_address` | `text` | Postal code
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`country_name` | `text` | IPv4 or IPv6 address
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#### Returns
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Geometry (point, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_ipaddress_point('102.23.34.1')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_ipaddress_point('102.23.34.1')
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```
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## Street-level geocoder
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This function provides a street-level geocoding service. This service uses the street level geocoder defined for the user.
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**This service is subject to quota limitations, and extra fees may apply**. Please view our [terms and conditions](https://cartodb.com/terms/) and check out the [Quota information section](http://docs.cartodb.com/cartodb-platform/dataservices-api/quota-information/) for details and recommendations related with quota usage.
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### cdb_geocode_street_point(_search_text text, [city text], [state text], [country text]_)
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#### Arguments
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Name | Type | Description
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`searchtext` | `text` | searchtext contains free-form text containing address elements. You can specify the searchtext parameter by itself, or you can specify it with other parameters to narrow your search. For example, you can specify the state or country parameters, along with a free-form address in the searchtext field.
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`city` | `text` | (Optional) Name of the city
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`state` | `text` | (Optional) Name of the state
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`country` | `text` | (Optional) Name of the country
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#### Returns
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Geometry (point, EPSG 4326) or null
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#### Example
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##### Select
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```bash
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SELECT cdb_geocode_street_point('651 Lombard Street, San Francisco, California, United States')
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SELECT cdb_geocode_street_point('651 Lombard Street', 'San Francisco')
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SELECT cdb_geocode_street_point('651 Lombard Street', 'San Francisco', 'California')
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SELECT cdb_geocode_street_point('651 Lombard Street', 'San Francisco', 'California', 'United States')
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```
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##### Update
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```bash
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UPDATE {tablename} SET the_geom = cdb_geocode_street_point({street_name_column})
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```
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