155 lines
8.7 KiB
Markdown
155 lines
8.7 KiB
Markdown
Postal code geocoder
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===============
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This section is divided in geocoding postal codes as points or as polygons. Each option has its own sources and its own functions which are described below.
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# Postal code geocoder: Polygons
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## Function
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By following the next steps a table is populated with zipcodes from Australia, Canada, USA and France (identified by iso3) related with their spatial location in terms of polygons.
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## Creation steps
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1. Import the four files attached in the section "Datasources" for Australia (`doc` table), Canada (`gfsa000a11a_e` table), USA (`tl_2013_us_zcta510` table) and France (`codes_postaux` table).
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2. Run `sql/build_data_table.sql`. Notice that table `postal_code_polygons` should exist in advance with columns: `the_geom`, `adm0_a3` and `postal_code`.
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## Tables
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### postal_code_polygons
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#### Table structure
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````
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Table "public.postal_code_polygons"
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Column | Type | Modifiers | Storage | Stats target | Description
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----------------------+--------------------------+-----------------------------------------------------------------------+----------+--------------+-------------
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cartodb_id | integer | not null default nextval('untitled_table_2_cartodb_id_seq'::regclass) | plain | |
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postal_code | text | | extended | |
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adm0_a3 | text | | extended | |
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created_at | timestamp with time zone | not null default now() | plain | |
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updated_at | timestamp with time zone | not null default now() | plain | |
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the_geom | geometry(Geometry,4326) | | main | |
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the_geom_webmercator | geometry(Geometry,3857) | | main | |
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````
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#### Current indexes
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````
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Indexes:
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"untitled_table_2_pkey" PRIMARY KEY, btree (cartodb_id)
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"idx_postal_code_polygons_a3_code" UNIQUE, btree (adm0_a3, postal_code)
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"untitled_table_2_the_geom_idx" gist (the_geom)
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"untitled_table_2_the_geom_webmercator_idx" gist (the_geom_webmercator)
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````
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## Related functions
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### geocode_postalcode_polygons
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````
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Schema | Name | Result data type | Argument data types | Type
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--------+-----------------------------+-------------------------------------+---------------------------------------+--------
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public | geocode_postalcode_polygons | SETOF geocode_postalint_country_v1 | code integer[], inputcountries text[] | normal
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public | geocode_postalcode_polygons | SETOF geocode_namedplace_v1 | code text[] | normal
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public | geocode_postalcode_polygons | SETOF geocode_namedplace_country_v1 | code text[], inputcountries text[] | normal
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public | geocode_postalcode_polygons | SETOF geocode_namedplace_v1 | code text[], inputcountry text | normal
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`````
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### test_geocode_postalcode_polygons
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````
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Schema | Name | Result data type | Argument data types | Type
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--------+----------------------------------+-------------------------------------+------------------------------------+--------
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public | test_geocode_postalcode_polygons | SETOF geocode_namedplace_country_v1 | code text[], inputcountries text[] | normal
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public | test_geocode_postalcode_polygons | SETOF geocode_namedplace_v1 | code text[], inputcountry text | normal
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`````
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## Data Sources
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* Australian polygons - http://www.abs.gov.au/AUSSTATS/abs@.nsf/DetailsPage/2033.0.55.0012011?OpenDocument - Download the KMZ for *Postal Area IRSD, SEIFA 2011*. Unzip and upload the kmz
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* Canadian polygons - http://www12.statcan.gc.ca/census-recensement/2011/geo/bound-limit/bound-limit-2011-eng.cfm - Download ESRI Shp, Forward Sortation Areas, Digital Boundary
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* USA polygons - http://www2.census.gov/geo/tiger/TIGER2013/ZCTA5/tl_2013_us_zcta510.zip
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* French polygons - http://www.data.gouv.fr/dataset/fond-de-carte-des-codes-postaux
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# Postal code geocoder: Points
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## Function
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By following the next steps a table is populated with zipcodes of different countries (identified by iso3) related with their spatial location in terms of points.
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This dataset includes data for the following countries:
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````
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CH, ES, GU, ZA, MX, SJ, NL, RU, AX, TH, AR, MY, RE, LK, GB, IS, GL, JE, DK, IN,
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SI, GP, MQ, BR, SM, BG, NZ, MP, CZ, DO, MD, PK, TR, VI, BD, GG, LT, PM, MC, US,
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IT, LU, SK, LI, PR, IM, NO, PT, PL, FI, JP, CA, DE, HU, PH, SE, VA, YT, MK, FR,
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MH, RO, FO, GF, AD, HR, DZ, GT, AU, AS, BE, AT
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````
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## Creation steps
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1. Download the allCountries.zip file from [GeoNames](www.geonames.org). Import and rename the table as tmp_zipcode_points. You can follow the manual process explained below instead.
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The columns that are loaded are the following ones:
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field_1: corresponding to ISO2
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field_10: corresponds to latitude
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field_11: corresponds to longitude
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field_2: corresponds to ZIP code
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2. Georeference the table using field11 as longitude and field10 as latitude in order to construct the_geom.
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3. Add column iso3 (text) and run sql/build_zipcode_points_table.sql.
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**Alternative manual process for importing and preprocessing**
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Open the allCountries.txt file with Excel an add a new row on top. Delete columns C-I and L.
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In the first row, add the following columns: iso2, zipcode, lat, long.
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Import the file ignoring step 2.
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## Tables
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### postal_code_points
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#### Table structure
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````
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Table "public.postal_code_points"
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Column | Type | Modifiers | Storage | Stats target | Description
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----------------------+--------------------------+------------------------------------------------------------------------+----------+--------------+-------------
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cartodb_id | integer | not null default nextval('untitled_table_2_cartodb_id_seq2'::regclass) | plain | |
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adm0_a3 | text | | extended | |
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postal_code | text | | extended | |
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created_at | timestamp with time zone | not null default now() | plain | |
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updated_at | timestamp with time zone | not null default now() | plain | |
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the_geom | geometry(Geometry,4326) | | main | |
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the_geom_webmercator | geometry(Geometry,3857) | | main | |
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````
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#### Current indexes
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````
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"untitled_table_2_pkey2" PRIMARY KEY, btree (cartodb_id)
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"untitled_table_2_the_geom_idx2" gist (the_geom)
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"untitled_table_2_the_geom_webmercator_idx2" gist (the_geom_webmercator)
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````
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## Related functions
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### geocode_postalcode_points
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````
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Schema | Name | Result data type | Argument data types | Type
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--------+---------------------------+------------------------------------+---------------------------------------+--------
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public | geocode_postalcode_points | SETOF geocode_postalint_country_v1 | code integer[], inputcountries text[] | normal
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public | geocode_postalcode_points | SETOF geocode_namedplace_v1 | code text[] | normal
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public | geocode_postalcode_points | SETOF geocode_place_country_iso_v1 | code text[], inputcountries text[] | normal
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public | geocode_postalcode_points | SETOF geocode_namedplace_v1 | code text[], inputcountry text | normal
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`````
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## Data Sources
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* All countries points [GeoNames](www.geonames.org) - http://download.geonames.org/export/zip/allCountries.zip
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# Known issues:
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* The name of the countries added in a column are not being sanitized https://github.com/CartoDB/cartodb/issues/3392
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# Historic:
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* [24/06/2015]:
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* Updated readme.md: added information about tables, function, indexes and the known issues section.
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