ewalk153/osmbpfextract

osmbpfextract

osmbpfextract is a program to filter OpenStreetMap PBF format data files. The filter performs six passes on the input PBF filter, and then writes a new output PBF file. The six passes are:

1. Find the OSMHeaders data block and ensure that we support reading this file.
2. Find ways that match a given tag criteria (eg. leisure=golf_course), and extract their node references.
3. Calculate bounding boxes for each way given the bounding boxes found in (2).
4. Find all the nodes within the bounding boxes from (3).
5. Find all the ways that reference nodes found in (4).
6. Find all the nodes that are referenced by the ways found in (5).

The nodes and ways collected in passes (3), (4) and (5) are then output into a new PBF format data file.

osmbpfextract is written in _Go. It is highly concurrent, so you can expect it to use up all your CPU power. osmbpfextract can filter out 1MB of golf course areas from a 1GB PBF file in about 9 minutes, using 789% of a Core i7 processor.

Building

Building osmbpfextract is easy:

go install ./...

Examples

This app has been rebuilt from the original to just filter highways and output the result to nodes and ways files.

osmbpfextract -i alberta.osm.pbf

Command-Line Options

-i	Input file
-o	Output file
-t	Filter tag key
-v	Filter tag value
--high-memory	Cache every decompressed block in memory. This can cause a 25% performance improvement in filtering, but is only recommended for small files. For a ~100MB PBF file, this will increase memory usage by about 100MB; for a 1GB PBF file, memory usage will jump to 8GB or more.

This code is a fork of https://github.com/mfenniak/go-osmpbf-filter with significant reworking.