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¶
- •
- 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.
- •
- 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.