[GIS] Extracting country specific data from planet openstreetmap big file

openstreetmap

I am trying to obtain few old osm dataset of few specific countries/regions to see subsequent changes till now. I am using planet osm files which I think is the only source of old osm archieves. But after extraction planet osm file it's taking aroung 350GB enormous space. Although there is Osmfilter to extract specific tags, but I want to extract specific countries and regions instead. I have already tried QGIS, Linus-Terminal and PostgreSQL in order to do something further but this huge file is rather killing them. Any help regarding how to proceed?

Best Answer

There are various services offering country and area extracts. You can try to get into contact with one of the responsible people and ask how they are doing it. There is also a similar question at help.openstreetmap.org.

Geofabrik offers some background information with technical details and also provides .poly files which you can use for osmosis/osmconvert.

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[GIS] Data visualisation from OSM planet

There is a tool Osmosis written in JAVA that can be used for advanced data manipulation in OSM format.

For instance you could parse planet.osm and only extract hospitals (geometry and attributes) using:

osmosis --read-xml input.osm --tag-filter accept-nodes amenity=hospital --write-xml output.osm

Actually you could pipe output directly to osm2pgsql command and load data to PostGIS database, or convert osm data to format that is more readable by common GIS software.

I'm not sure how long will it take to parse planet.osm, but you could start with smaller area and work your way up. Also, you can use osmosis to extract a smaller area of interest from planet.osm, if daily prepared extracts don't satisfy your needs.

OpenStreetMap – Extracting Primary and Secondary Roads from OpenStreetMap Data

As already mentioned you have to look at the highway key.

The colors you are talking about are defined by the rendering stylesheet and represent the following tags:

blue: highway=motorway, highway=motorway_link
green: highway=trunk, highway=trunk_link
red: highway=primary, highway=primary_link
orange: highway=secondary, highway=secondary_link
yellow: highway=tertiary, highway=tertiary_link

For more details on the colors refer to the stylesheet of the current default layer at openstreetmap.org. There is also a description on the international equivalence of these values.

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OpenStreetMap – Extracting Primary and Secondary Roads from OpenStreetMap Data

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