[OSM-talk] Source tags and changesets (was ... ODbL ...)

[Pieren]

On Fri, Jun 17, 2011 at 7:35 AM, Ed Avis <eda at waniasset.com> wrote:

> That sounds like a great idea.  (Does Merkaartor have support for this?)
>
>
'source' in the changeset has the disadvantage that it disappears  from the
planet dumps or simple API extracts. This can be a legal issue for some
sources (it is in France with the cadastre). I hope the next API will
provide some more clever solution than the current one where we attach the
source 'cadastre' in all objects in France coming from there (which explains
the current statistics: http://taginfo.openstreetmap.org/keys/source#values
).

It also depends on how people are contributing. As already mentionned, it is
easy if you have a unique source only. And the amount of available sources
and their quality varies from country to country. Again, in France, we have
a very good source for roads, geometry and accuracy - the cadastre - but
very poor about the content (landuse, access restrictions, etc) which is
then compensated by local survey or aerial imagery. The result is that many
contributions are often a mix of different sources.

About the source, another equal importance information is its freshness. We
can see edits changing 2 years old surveyed data based on 5 years old Bing
imagery ...

Pieren
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