[Tagging] Any support for a flow tag?

Tobias Knerr osm at tobias-knerr.de
Thu Mar 31 20:16:10 BST 2011

Nathan Edgars II:
> I'm wondering if there would be any support for a
> flow=forward/backward/etc. tag for waterways. This would make the flow
> direction explicit, and would provide a machine-readable way to tag
> unknown or abnormal flow.

"I will explicitly tag implied information to reduce the risk of
misunderstandings" is usually a good idea. The problem is that this will
ultimately mean the loss of all the current implicit flow direction data
- someone will come along and insist that the lack of a flow tag now
means "unknown flow direction". And, contrary to your experiences, my
impression is that the implicit flow direction around here is almost
always correct.

So, as always, the problem is the lack of a migration strategy for
existing data conforming to the current conventions.

Tobias Knerr

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