DOWNLOADOSMTILES(1p)					User Contributed Perl Documentation				      DOWNLOADOSMTILES(1p)

NAME

       downloadosmtiles.pl - Download map tiles from OpenStreetMap

SYNOPSIS

	 downloadosmtiles.pl --lat=49.5611:49.6282 --lon=10.951:11.0574 --zoom=13:14
	 downloadosmtiles.pl --link='http://www.openstreetmap.org/?lat=-23.5872&lon=-46.6508&zoom=12&layers=B000FTF'
	 downloadosmtiles.pl --loadtilelist=filename

DESCRIPTION

       This script downloads all map tiles from an OpenStreetMap tile server for some geographic region in a range of zoom levels.  The PNG images
       of the tiles are stored in a directory tree that mirrors the paths from the server.

       A bounding box of geographic coordinates and a range of zoom levels must be selected by command line options.

COMMAND LINE OPTIONS

       Command line options may be abbreviated as long as they remain unambiguous.

       At least either "--latitude", "--longitude", and "--zoom" or "--link" must be specified.

   "--latitude=latmin[:latmax]"
       Selects the latitude of the bounding box of coordinates to download.  May be one single real value or two real values separated by a colon
       in the range "-85.0511..85.0511".  If given only one value, just the tile (or row of tiles) at this latitude will be downloaded.

       Default: none

   "--longitude=lonmin[:lonmax]"
       Selects the longitude of the bounding box of coordinates to download.  May be one single real value or two real values separated by a colon
       in the range "-180.0..180.0".  If given only one value, just the tile (or column of tiles) at this longitude will be downloaded.

       Default: none

   "--zoom=zoommin[:zoommax]"
       Selects the range of zoom levels to download the map tiles for.	May be one single integer value or two integer values separated by a
       colon.  OpenStreetMap supports zoom levels in the range 0..18.  (This depends on the base URL and is not enforced by this script.)

       Note that the number of tiles to download grows by a factor of up to four with each zoom level.

       Default: none

   "--link=url"
       An URL selecting "--latitude", "--longitude", and "--zoom" in one argument.  The idea is to select the current view of OSM's slippy map by
       its permalink.

       The argument to "--link" must be an URL containing the HTTP options "?lat=s&lon=s&zoom=s".  (Actually, the base URL will be ignored.)  The
       script chooses a box around the latitude and longitude options.	The size of the box depends on the zoom option.

       If combined with "--latitude", "--longitude", or "--zoom", these explicitly specified values override the implicitly specified values from
       "--link".

       Default: none

   "--baseurl=url"
       The base URL of the server to download the tiles from.

       Default: <http://tile.openstreetmap.org> (This is the base URL for the Mapnik tiles.)

   "--destdir=dir"
       The directory where the tiles will be stored.  The PNG files will be stored as "dir/zoom/x/y.png".

       Default: The current working directory.

   "--quiet"
       Do not write any diagnostic messages.  Only fatal errors will be reported.

   "--dumptilelist=filename"
       Do not download any tiles at all, but write a list of tiles as selected by other command line options to the file named "filename".  See
       "TILE LISTS" below.

   "--loadtilelist=filename"
       Read a list of tiles to download from the file "filename".  See "TILE LISTS" below.

EXAMPLE

       Select the region of interest in OSM's slippy map and follow the permalink in the lower left of the window.  Lets assume this permalink to
       be <http://www.openstreetmap.org/?lat=49.5782&lon=11.0076&zoom=12&layers=B000FTF>.  Then

	 downloadosmtiles.pl --link='http://www.openstreetmap.org/?lat=49.5782&lon=11.0076&zoom=12&layers=B000FTF' --zoom=5:18

       will download all tiles from zoom level 5 to 18 for this region.

TILE LISTS

       A list of tiles may be stored to and retrieved from external files using the "--dumptilelist" and "--loadtilelist" command line options.  A
       set of tiles may be selected using the command line options "--latitude", "--longitude", "--zoom", and "--link" and written to a file
       specified with "--dumptilelist".  This list may be read at a later date using the "--loadtilelist" option.

       This may be useful to postpone the download of the tiles, to edit the list of tiles, or to use some external tool to generate this list.

       The tile lists are read and written in YAML format.  Please note that this is an experimental feature in the current version.  The file
       format is not considered stable yet.  There is no guarantee that a list of tiles generated by one version of this script may be read in by
       a future version.

ENVIRONMENT

       http_proxy
       ftp_proxy
       xxx_proxy
       no_proxy
	   These environment variables can be set to enable communication through a proxy server.  This is implemented by LWP::UserAgent.

BUGS

       o   Ranges in the command line options must always be increasing.  While this is considered a feature for "--latitude" and "--zoom", it
	   means that it is impossible for a range in the "--longitude" argument to cross the 180 degree line.	A command line option like
	   "--longitude=179.5:-179.5" will not work as one should expect.

       o   The bounding box selected by the "--link" command line option does not always correspond to the current view in the slippy map.  The
	   problem is that the permalink from the slippy map only contains one position and not the bounds of the current view.  The actual view
	   of the slippy map depends on many factors, including the size of the browser window.  Thus, there is not much that can be done about
	   this issue.

SEE ALSO

       <http://wiki.openstreetmap.org/wiki/Slippy_Map>

AUTHOR

       Rolf Krahl <rotkraut@cpan.org>

COPYRIGHT AND LICENCE

       Copyright (C) 2008-2010 by Rolf Krahl

       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.

perl v5.14.2							    2010-05-15						      DOWNLOADOSMTILES(1p)