[OSM-talk] Source as attribute of object or changeset ? [was: Re: Import guidelines & OSMF/DWG governance]

Jean-Marc Liotier jm at liotier.org
Wed Sep 19 15:20:29 BST 2012


On 19/09/2012 15:58, Martin Koppenhoefer wrote:
> It seems that you generally apply the source-tag to the osm object 
> instead of the changeset comment, but I'd propose to do it the other 
> way round. There are already tens of millions of objects in the db 
> with related source-tags 
> http://taginfo.openstreetmap.org/search?q=source+%3D+cadastre-dgi-fr 
> and putting it into the changeset comment could possibly reduce the 
> size of the objects tables in the db. This leads also to another 
> question: how should a mapper deal with these source tags when he 
> applies modifications to the object?
I suggest inheritance of source from the changeset, unless overridden by 
the object's source tag : let the changeset have an optional source 
attribute that applies to all the changeset's objects that do not have a 
source tag.

Editors such as JOSM could display a virtual source tag that contains 
information from its changeset's source attribute if it is present.

Have such schemes been proposed before ?




More information about the talk mailing list