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data-services/geocoder/postal-codes
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Carla d500a2cf63 Update README.md
2015-06-24 18:09:56 +02:00
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clean empty postal code point rows
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README.md
Update README.md
2015-06-24 18:09:56 +02:00

README.md

Postal code geocoder

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.

Postal code geocoder: Polygons

Function

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.

Creation steps

  1. Import the four files attached in the section "Datasources".

  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.

Data Sources

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

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

USA polygons - http://www2.census.gov/geo/tiger/TIGER2013/ZCTA5/tl_2013_us_zcta510.zip

French polygons - http://www.data.gouv.fr/dataset/fond-de-carte-des-codes-postaux

Preparation details

The names of the imported files are:

  • doc for Australia table
  • gfsa000a11a_e for Canada table
  • tl_2013_us_zcta510 for USA table
  • codes_postaux for France table

Postal code geocoder: Points

Function

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.

This dataset includes data for the following countries:

CH, ES, GU, ZA, MX, SJ, NL, RU, AX, TH, AR, MY, RE, LK, GB, IS, GL, JE, DK, IN,
SI, GP, MQ, BR, SM, BG, NZ, MP, CZ, DO, MD, PK, TR, VI, BD, GG, LT, PM, MC, US,
IT, LU, SK, LI, PR, IM, NO, PT, PL, FI, JP, CA, DE, HU, PH, SE, VA, YT, MK, FR,
MH, RO, FO, GF, AD, HR, DZ, GT, AU, AS, BE, AT

Creation steps

  1. Download the allCountries.zip file from GeoNames. Import and rename the table as tmp_zipcode_points. You can follow the manual process explained below instead.

The columns that are loaded are the following ones: field_1: corresponding to ISO2 field_10: corresponds to latitude field_11: corresponds to longitude field_2: corresponds to ZIP code

  1. Georeference the table using field11 as longitude and field10 as latitude in order to construct the_geom.

  2. Add column iso3 (text) and run sql/build_zipcode_points_table.sql.

Alternative manual process

Open the allCountries.txt file with Excel an add a new row on top. Delete columns C-I and L.

In the first row, add the following columns: iso2, zipcode, lat, long.

Import the file ignoring step 2.

Data Sources

All countries points GeoNames - http://download.geonames.org/export/zip/allCountries.zip

Preparation details

The big size of the dataset may cause interruptions in the processing of the coordinates after uploading the file, manipulating the file before importing is a faster workaround.

Known issues:

Historic:

  • [24/06/2015]:
    • Updated readme.md: added information about tables, function, indexes and the known issues section.