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.IX Title "Geo::OSM::Tiles 3pm"
.TH Geo::OSM::Tiles 3pm "2016-05-29" "perl v5.22.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Geo::OSM::Tiles \- Calculate tile numbers for OpenStreetMap
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Geo::OSM::Tiles qw( :all );
\&
\&  $zoom = 13;
\&  $lat = 49.60055;
\&  $lon = 11.01296;
\&  $tilex = lon2tilex($lon, $zoom);
\&  $tiley = lat2tiley($lat, $zoom);
\&  $path = tile2path($tilex, $tiley, $zoom);
\&  $tileurl = "http://tile.openstreetmap.org/$path";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides functions for calculating the path to a map tile
at OpenStreetMap out of geographic coordinates.  The path of a tile at
\&\s-1OSM\s0 has the form \f(CW\*(C`$zoom/$tilex/$tiley.png\*(C'\fR.  The numbering scheme is
documented in the \s-1OSM\s0 wiki, see the link below.
.ie n .SS """lon2tilex($lon, $zoom)"""
.el .SS "\f(CWlon2tilex($lon, $zoom)\fP"
.IX Subsection "lon2tilex($lon, $zoom)"
Returns \f(CW$tilex\fR for the tile at longitude \f(CW$lon\fR and zoom level
\&\f(CW$zoom\fR.  The longitude must be in the range \f(CW\*(C`\-180.0 <= $lon < 180.0\*(C'\fR.
The zoom level must be a non-negative integer.
.ie n .SS """lat2tiley($lat, $zoom)"""
.el .SS "\f(CWlat2tiley($lat, $zoom)\fP"
.IX Subsection "lat2tiley($lat, $zoom)"
Returns \f(CW$tiley\fR for the tile at latitude \f(CW$lat\fR and zoom level
\&\f(CW$zoom\fR.  The latitude must be in the range \f(CW\*(C`\-85.0511 <= $lat <= 85.0511\*(C'\fR.
The zoom level must be a non-negative integer.
.ie n .SS """tile2path($tilex, $tiley, $zoom)"""
.el .SS "\f(CWtile2path($tilex, $tiley, $zoom)\fP"
.IX Subsection "tile2path($tilex, $tiley, $zoom)"
Composes the path to the tile at \f(CW$tilex\fR, \f(CW$tiley\fR, and \f(CW$zoom\fR at
the \s-1OSM\s0 server.  \f(CW$tilex\fR and \f(CW$tiley\fR must be integers in the range
\&\f(CW\*(C`0..2**$zoom\-1\*(C'\fR.  The supported range of zoom levels depends on the
tile server.  The maximum zoom for the Osmarender layer is 17, it is
18 for the Mapnik layer.
.ie n .SS """checklonrange($lonmin, $lonmax)"""
.el .SS "\f(CWchecklonrange($lonmin, $lonmax)\fP"
.IX Subsection "checklonrange($lonmin, $lonmax)"
Checks whether \f(CW$lonmin\fR and \f(CW$lonmax\fR are within the allowed range
of the longitude argument to \f(CW\*(C`lon2tilex\*(C'\fR.  Returns
\&\f(CW\*(C`($lonmin, $lonmax)\*(C'\fR unchanged if they are ok or corrected values if
not.
.ie n .SS """checklatrange($latmin, $latmax)"""
.el .SS "\f(CWchecklatrange($latmin, $latmax)\fP"
.IX Subsection "checklatrange($latmin, $latmax)"
Checks whether \f(CW$latmin\fR and \f(CW$latmax\fR are within the allowed range
of the latitude argument to \f(CW\*(C`lat2tiley\*(C'\fR.  Returns
\&\f(CW\*(C`($latmin, $latmax)\*(C'\fR unchanged if they are ok or corrected values if
not.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
<http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames>
.SH "AUTHOR"
.IX Header "AUTHOR"
Rolf Krahl <rotkraut@cpan.org>
.SH "COPYRIGHT AND LICENCE"
.IX Header "COPYRIGHT AND LICENCE"
Copyright (C) 2008\-2010 by Rolf Krahl
.PP
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.