Per Henrik Johansen > Geo-GeoNames-0.05 > Geo::GeoNames

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Module Version: 0.05   Source   Latest Release: Geo-GeoNames-1.01_01

NAME ^

Geo::GeoNames - Perform geographical queries using GeoNames Web Services

SYNOPSIS ^

  use Geo::GeoNames;
  use Data::Dumper;
  my $geo = new Geo::GeoNames();
  
  # make a query based on placename
  my $result = $geo->search(q => 'Fredrikstad', maxRows => 2);
  
  # print the first result
  print " Name: " . $result->[0]->{name};
  print " Longitude: " . $result->[0]->{lng};
  print " Lattitude: " . $result->[0]->{lat};
  
  # Dump the data structure into readable form
  # This also will show the attributes to each found location
  Data::Dumper->Dump()
  
  # Make a query based on postcode
  $result = $geo->postalcode_search(postalcode => "1630", maxRows => 3, style => "FULL"); 

DESCRIPTION ^

Provides a perl interface to the webservices found at http://ws.geonames.org. That is, given a given placename or postalcode, the module will look it up and return more information (longitude, lattitude, etc) for the given placename or postalcode. Wikipedia lookups are also supported. If more than one match is found, a list of locations will be returned.

METHODS ^

new
  $geo = Geo::GeoNames->new()
  $geo = Geo::GeoNames->new(url => $url)

Constructor for Geo::GeoNames. It returns a reference to an Geo::GeoNames object. You may also pass the url of the webservices to use. The default value is http://ws.geonames.org and is the only url, to my knowledge, that provides the services needed by this module.

geocode($placename)

This function is just an easy access to search. It is the same as saying:

  $geo->search(q => $placename);
search(arg => $arg)

Searches for information about a placename. Valid names for arg are as follows:

  q => $placename
  name => $placename
  name_equals => $placename
  maxRows => $maxrows
  startRow => $startrow
  country => $countrycode
  adminCode1 => $admin1
  adminCode2 => $admin2
  adminCode3 => $admin3
  fclass => $fclass
  lang => $lang
  type => $type
  style => $style

One, and only one, of q, name, or name_equals must be supplied to this function.

For a thorough description of the arguments, see http://www.geonames.org/export/geonames-search.html

find_nearby_placename(arg => $arg)

Reverse lookup for closest placename to a given coordinate. Valid names for arg are as follows:

  lat => $lat
  lng => $lng
  radius => $radius
  style => $style

Both lat and lng must be supplied to this function.

For a thorough descriptions of the arguments, see http://www.geonames.org/export

find_nearest_address(arg => $arg)

Reverse lookup for closest address to a given coordinate. Valid names for arg are as follows:

  lat => $lat
  lng => $lng

Both lat and lng must be supplied to this function.

For a thorough descriptions of the arguments, see http://www.geonames.org/maps/reverse-geocoder.html

US only.

find_nearest_intersection(arg => $arg)

Reverse lookup for closest intersection to a given coordinate. Valid names for arg are as follows:

  lat => $lat
  lng => $lng

Both lat and lng must be supplied to this function.

For a thorough descriptions of the arguments, see http://www.geonames.org/maps/reverse-geocoder.html

US only.

find_nearby_streets(arg => $arg)

Reverse lookup for closest streets to a given coordinate. Valid names for arg are as follows:

  lat => $lat
  lng => $lng

Both lat and lng must be supplied to this function.

For a thorough descriptions of the arguments, see http://www.geonames.org/maps/reverse-geocoder.html

US only.

postalcode_search(arg => $arg)

Searches for information about a postalcode. Valid names for arg are as follows:

  postalcode => $postalcode
  placename => $placename
  country => $country
  maxRows => $maxrows
  style => $style

One, and only one, of postalcode or placename must be supplied to this function.

For a thorough description of the arguments, see http://www.geonames.org/export

find_nearby_postalcodes(arg => $arg)

Reverse lookup for postalcodes. Valid names for arg are as follows:

  lat => $lat
  lng => $lng
  radius => $radius
  maxRows => $maxrows
  style => $style
  country => $country

Both lat and lng must be supplied to this function.

For a thorough description of the arguments, see http://www.geonames.org/export

postalcode_country_info

Returns a list of all postalcodes found on GeoNames. This function takes no arguments.

country_info(arg => $arg)

Returns country information. Valid names for arg are as follows:

  country => $country
  lang => $lang

For a thorough description of the arguments, see http://www.geonames.org/export

find_nearby_wikipedia(arg => $arg)

Reverse lookup for Wikipedia articles. Valid names for arg are as follows:

  lat => $lat
  lng => $lng
  radius => $radius
  maxRows => $maxrows
  lang => $lang
  country => $country

Both lat and lng must be supplied to this function.

For a thorough description of the arguments, see http://www.geonames.org/export

find_nearby_wikipediaby_postalcode(arg => $arg)

Reverse lookup for Wikipedia articles. Valid names for arg are as follows:

  postalcode => $postalcode
  country => $country
  radius => $radius
  maxRows => $maxrows

Both postalcode and country must be supplied to this function.

For a thorough description of the arguments, see http://www.geonames.org/export

wikipedia_search(arg => $arg)

Searches for Wikipedia articles. Valid names for arg are as follows:

  q => $placename
  maxRows => $maxrows
  lang => $lang

q must be supplied to this function.

For a thorough description of the arguments, see http://www.geonames.org/export

wikipedia_bounding_box(arg => $arg)

Searches for Wikipedia articles. Valid names for arg are as follows:

  south => $south
  north => $north
  east => $east
  west => $west
  lang => $lang
  maxRows => $maxrows

south, north, east, and west and must be supplied to this function.

For a thorough description of the arguments, see http://www.geonames.org/export

RETURNED DATASTRUCTURE ^

The datastructure returned from methods in this module is an array of hashes. Each array element contains a hash which in turn contains the information about the placename/postalcode.

For example, running the statement

  my $result = $geo->search(q => "Fredrikstad", maxRows => 3, style => "FULL");

yields the result (after doing a Data::Dumper->Dump($result);):

  $VAR1 = {
           'population' => {},
           'lat' => '59.2166667',
           'elevation' => {},
           'countryCode' => 'NO',
           'adminName1' => "\x{d8}stfold",
           'fclName' => 'city, village,...',
           'adminCode2' => {},
           'lng' => '10.95',
           'geonameId' => '3156529',
           'timezone' => {
                         'dstOffset' => '2.0',
                         'content' => 'Europe/Oslo',
                         'gmtOffset' => '1.0'
                       },
           'fcode' => 'PPL',
           'countryName' => 'Norway',
           'name' => 'Fredrikstad',
           'fcodeName' => 'populated place',
           'alternateNames' => 'Frederikstad,Fredrikstad,Fredrikstad kommun',
           'adminCode1' => '13',
           'adminName2' => {},
           'fcl' => 'P'
         };

The elements in the hashes depends on which style is passed to the method, but will always contain name, lng, and lat except for postalcode_country_info(), find_nearest_address(), find_nearest_intersection(), and find_nearby_streets().

BUGS ^

Not a bug, but the GeoNames services expects placenames to be UTF-8 encoded, and all data recieved from the webservices are also UTF-8 encoded. So make sure that strings are encoded/decoded based on the correct encoding.

Please reports any bugs found or feature requests to http://code.google.com/p/geo-geonames/issues/list

SEE ALSO ^

http://www.geonames.org/export

SOURCE AVAILABILITY ^

The source code for this module is available from SVN at http://code.google.com/p/geo-geonames

AUTHOR ^

Per Henrik Johansen, <per.henrik.johansen@gmail.com>

COPYRIGHT AND LICENSE ^

Copyright (C) 2007 by Per Henrik Johansen

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.

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