changetags

changetags

List the tags added, modified or deleted by an OpenStreetMap changeset.

It needs to receive the data in the real-changesets format (example of a real-changesets file).

The osm-adiff-parser library can be used to produce real-changesets from OSM augmented diffs (.osc files).

Purpose

The main purpose of this library is to input in OSMCha database the OSM tags that were affected by a changeset. That way, users will be able to query OSMCha with key/value tag combinations.

How it works

It uses two logics to determine the tags that will be included in the result.

Created and deleted features

On features that were created or deleted in a changeset, it includes only the main tags (check the list).

Examples:

• Changeset that added a new building with the following tags:

building=yes
building:levels=2
addr:housenumber=31
addr:street=Calle 13
name=The House

will have only building=yes as the result.

• Changeset that deleted a road with the following tags:

highway=primary
surface=asphalt
name=Spring Road
ref=CL-001

will have only highway=primary as the result.

Modified features

We include the main tags of the modified features and also the tags that were modified.

Examples

• Changeset that modified the tags of a bank from:

amenity=bank
name=Unicaja Banco
operator=unicaja

to

brand=Unicaja Banco
brand:wikidata=Q2543704
brand:wikipedia=en:Unicaja
short_name=Unicaja
amenity=bank
name=Unicaja Banco
operator=unicaja

will have as the result:

brand=Unicaja Banco
brand:wikidata=Q2543704
brand:wikipedia=en:Unicaja
short_name=Unicaja
amenity=bank

• Changeset that modified the geometry of a stadium

If only the geometry changed, it will include only the main tag, so the result will be leisure=stadium.

Data structure

The data returned by the createTagDiff function is an object whose each entry is an array.

{
  amenity: ["restaurant"],
  highway: ["service", "tertiary", "secondary_link", "footway"],
  surface: ["asphalt", "paved"],
  office: ["diplomatic"]
}

Support

This library was funded by Wikimedia Italia.

License

MIT