313 lines
7.6 KiB
Markdown
313 lines
7.6 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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```sql
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SELECT cdb_geocode_admin0_polygon('France')
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```
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##### Update
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```sql
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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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```sql
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SELECT cdb_geocode_admin1_polygon('Alicante')
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```
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##### Update
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```sql
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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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```sql
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SELECT cdb_geocode_admin1_polygon('Alicante', 'Spain')
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```
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##### Update
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```sql
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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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```sql
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SELECT cdb_geocode_namedplace_point('Barcelona')
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```
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##### Update
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```sql
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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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```sql
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SELECT cdb_geocode_namedplace_point('Barcelona', 'Spain')
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```
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##### Update
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```sql
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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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```sql
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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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```sql
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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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### 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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```sql
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SELECT cdb_geocode_postalcode_polygon('11211', 'USA')
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```
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##### Update
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```sql
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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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**Note:** For the USA, US Census ZCTAs are considered.
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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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```sql
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SELECT cdb_geocode_postalcode_point('11211', 'USA')
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```
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##### Update
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```sql
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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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```sql
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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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```sql
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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 (currently, only the Here geocoder is available).
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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/)
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Be mindful of the following when using this function:
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- **One credit per function call will be consumed**, and the results are not cached. If the query applies to a N rows dataset, then N credits will be used.
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- You are discouraged from using dynamic queries to the Geocoder API in your maps. This can result in credits consumption per map view. Note: **queries to the Geocoder API in your maps may be forbidden in the future**.
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- You are advised to store results of Geocoder API queries into your datasets and refresh them as needed, so that you can have finer control on your credits' 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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--- | --- | ---
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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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```sql
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SELECT cdb_geocode_geocode_street_point('651 Lombard Street, San Francisco, California, United States')
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SELECT cdb_geocode_geocode_street_point('651 Lombard Street' 'San Francisco')
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SELECT cdb_geocode_geocode_street_point('651 Lombard Street' 'San Francisco', 'California')
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SELECT cdb_geocode_geocode_street_point('651 Lombard Street' 'San Francisco', 'California', 'United States')
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```
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##### Update
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```sql
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UPDATE {tablename} SET {the_geom} = cdb_geocode_street_point({street_name_column})
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```
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