On Fri, Jun 17, 2011 at 7:35 AM, Ed Avis <[email protected]> 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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