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osmcoastline_filter - filter coastline data from OpenStreetMap file


osmcoastline_filter –output=OUTPUT_FILE INPUT-FILE

osmcoastline_filter –help


osmcoastline_filter is used to filter all nodes and ways needed for building the coastlines from an OSM planet. The data is written to the output file in PBF format.

This output file will be a lot smaller (less than 1%) than the original planet file, but it contains everything needed to assemble the coastline and land or water polygons.

If you are playing around or want to run osmcoastline several times with different parameters, run osmcoastline_filter once first and use its output as the input for osmcoastline.

osmcoastline_filter can read any file format supported by libosmium (in particular this is PBF, XML, and OPL files), but write only PBF files. PBF files are much smaller and faster to read and write than XML files. The output file will first contain all ways tagged “natural=coastline”, then all nodes used for those ways (and all nodes tagged “natural=coastline”). Having the ways first and the nodes later in the file is unusual for OSM files, but the osmcoastline and osmcoastline_ways programs work fine with it.


Display usage information
Where to write output (default: none)
Display program version and license information.


Run it as follows:

osmcoastline_filter -o coastline-data.osm.pbf planet.osm.pbf


osmcoastline(1), osmcoastline_ways(1)
Project page (
OSMCoastline in OSM wiki (


Copyright (C) 2012-2021 Jochen Topf <>. License GPLv3+: GNU GPL version 3 or later <>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


If you have any questions or want to report a bug, please go to


Jochen Topf <>.