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Theme explore

OpenStreetMap contains an insane amount of complex data. If you want to use some of that data a first step is often to explore what's there, filter out the stuff that looks interesting, create some experimental maps, figure out what's useable and how. The topics in this theme are meant as starting points for such an exploration, they are intended for advanced OSM users.

The data generated is intended to be used with an interactive tool such as QGIS to quickly display what's there in different ways.

Some of these topics import quite a lot of data and do extensive post-processing, try with a smaller extract before you run them on the planet file.

For some details on the contents of the generated database see the source code of the config file.

Naming

All table names have the respective topic as prefix.

Updates

Topics are mostly written in a way to allow updates of OSM data. But updates might take a while, so minutely updates are not possible for all of then. This should be improved upon.

Postprocessing

Use osm2pgsql-gen with the respective config file to run SQL commands that do some postprocessing on the imported data. Without that some tables and/or columns will not be filled with data.

Optional Pre-Filtering

For some topics it can make sense to pre-filter the OSM data, so that processing with osm2pgsql is faster. This is entirely optional. Each topic will show a command line using Osmium that does this pre-filtering.

QGIS Config

The qgis directory contains QGIS config files for each of the themes. They all use the database service explore. Create a file .pg_service.conf in your home directory (if it is not already there) and add an entry like this:

[explore]
host=localhost
port=5432
dbname=explore
user=USERNAME
password=PASSWORD

Topic: Admin Boundaries

Everything related to administrative boundaries.

Pre-Filtering:

osmium tags-filter -o admin_boundaries.osm.pbf DATA.osm.pbf \
    wr/boundary=administrative,disputed

Topic: Coastline

Explore coastline tagging. Everything tagged natural=coastline.

Coastline ways are shown, with details if zoomed in. Pseudo-coastlines along the 180° meridian and the South Pole that have special tagging are also shown. Coastlines can only be tagged on ways. Nodes and relations with tag natural=coastline are shown as errors. Coastline (self-)intersections and open ends are shown as errors as well.

Pre-Filtering:

osmium tags-filter -o coastline.osm.pbf DATA.osm.pbf \
    natural=coastline

Topic: Postcodes

Explore postcodes in OSM, on POIs, buildings, and from postcode boundaries.

Also generates postcode areas from points using convex hull and Voronoi decomposition.

Pre-Filtering:

osmium tags-filter -o postcodes.osm.pbf DATA.osm.pbf \
    'addr:*' r/postal_code

Topic: Protected Areas

Areas protected for nature conservancy such as national parks. There is a wide variety of types of such areas found around the world and also quite varied tagging.

Pre-Filtering:

osmium tags-filter -o protected_areas.osm.pbf DATA.osm.pbf \
    boundary=protected_area,national_park,water_protection_area \
    leisure=nature_reserve \
    protect_class protection_title short_protection_title

Topic: Restrictions

Turn restrictions (relations tagged type=restrictions) for road navigation.

Pre-Filtering:

osmium tags-filter -o restrictions.osm.pbf DATA.osm.pbf \
    w/highway w/amenity=parking r/type=restriction