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polygons
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Extracting subsets from planet.osm ---------------------------------- In this directory you will find a Perl script that allows you to extract a subset of the data from within the weekly planet.osm file. Running the script is as simple as: extract-polygon.pl [-v] -i planet.osm -o gb.osm -p gb.poly The options used in this example are -i to specify the input file (or you can use STDIN), -o to specify the ouput file (or you can use STDOUT), and -p to specify the polygon file. The polygon file is the only required option. If you run the script with the -h option it will print a full list of the available options. The -v makes the script verbose and prints out a progress meter. Polygon files ------------- Polygon files are ASCII text files containing a list of longitudes and latitudes. A file can contain more than one polygon so you can extract a number of different areas with a single command. An example of a polygon defining Great Britain and Ireland (and some of the smaller islands) is: 1 -0.6450E+01 0.4980E+02 -0.2000E+01 0.4890E+02 -0.1850E+01 0.4925E+02 -0.2080E+01 0.4973E+02 0.1350E+01 0.5090E+02 0.2250E+01 0.5258E+02 -0.0500E+01 0.6130E+02 -0.8920E+01 0.5785E+02 -0.1140E+02 0.5130E+02 -0.6450E+01 0.4980E+02 END You can also exclude areas by polygon. You do this by prefixing the number that starts a polygon with a "!". Otherwise it is the same. Contributed polygon files ------------------------- In this directory, along with the extract-polygon.pl script and this README file you will find polygon files contributed by the OSM community. If you want to contribute a polygon either add it to this directory and update the list below, or email it to Keith Sharp <kms@passback.co.uk>. Available polygon files: gb-irl.poly : Great Britain, Ireland, and the Islands. at.poly : Austria, <christof@dallermassl.at> spain.poly : Spain and Canary and Balearic islands