Geo::Hash - Encode / decode geohash.org locations.
This document describes Geo::Hash version 0.02
use Geo::Hash; my $gh = Geo::Hash->new; my $hash = $gh->encode( $lat, $lon ); my ( $lat, $lon ) = $gh->decode( $hash );
Geohash is a latitude/longitude geocode system invented by Gustavo Niemeyer when writing the web service at geohash.org, and put into the public domain.
This module encodes and decodes geohash locations.
See http://en.wikipedia.org/wiki/Geohash and http://geohash.org for more information.
new
Create a new Geo::Hash object.
my $gh = Geo::Hash->new;
precision
Infer a suitable precision (number of character in hash) for a given lat, lon pair.
my $prec = $gh->precision( $lat, $lon );
encode
Encode a lat, long pair into a geohash.
my $hash = $gh->encode( $lat, $lon );
You may optionally supply the length of the desired geohash:
# Very precise my $hash = $gh->encode( $lat, $lon, 10 );
If the precision argument is omitted precision will be used to provide a default.
decode_to_interval
Like decode but instead of returning a pair of coordinates returns the interval for each coordinate. This gives some indication of how precisely the original hash specified the location.
decode
The return value is a pair of array refs. Each referred to array contains the upper and lower bounds for each coordinate.
my ( $lat_range, $lon_range ) = $gh->decode_to_interval( $hash ); # $lat_range and $lon_range are references to two element arrays
Decode a geohash into a lat, long pair.
my ( $lat, $lon ) = $gh->decode( $hash );
Geo::Hash requires no configuration files or environment variables.
None.
None reported.
No bugs have been reported.
Please report any bugs or feature requests to bug-geo-hash@rt.cpan.org, or through the web interface at http://rt.cpan.org.
bug-geo-hash@rt.cpan.org
Andy Armstrong <andy@hexten.net>
<andy@hexten.net>
http://geohash.org/gcwrdtsvrfgr
Copyright (c) 2008, Andy Armstrong <andy@hexten.net>.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.
To install Geo::Hash, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Geo::Hash
CPAN shell
perl -MCPAN -e shell install Geo::Hash
For more information on module installation, please visit the detailed CPAN module installation guide.