[OSM-dev] Chopped of ways. New flag for OSM XML?

Jochen Topf jochen at remote.org
Tue Aug 12 14:50:14 BST 2008


When creating excerpts of OSM data with Osmosis, Osmosis will (depending
on flags) chop of ways, i.e. the output will contain ways with only some
of the nodes in the way. But looking at the XML there is no way to tell
that this has happened. The way still has the same ID and timestamp.
There should be a way of recognizing theses chopped of ways, say by
adding an incomplete="true" attribute or something.

This question came up on the German mailing list after somebody had used
the excerpt as basis for some automated fixing of data. He (IMHO correctly)
checked the Osmosis excerpt with current data from the API by comparing
the timestamps which were the same. So he assumed nothing had changed
and he could safely edit the data. But because of the excerpt process
the data he based his decision on, was not correct.

This is part of a larger problem. Say you create an extract with only
some of the tags or a relation with only some members.

Jochen Topf  jochen at remote.org  http://www.remote.org/jochen/  +49-721-388298

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