"Have such schemes been proposed before ?" Not sure about that.
But this is logical and feasible _if_ all added/edited objects in a changeset had/have the same source. I can only say for sure about my own mapping: It would be almost always impossible for me -- except when tracing in areas I've never been to. Other than that my sources are a colorful mix of: survey, knowledge, GPS, GPS-aligned imagery, imageries (Bing, Google 2010 in Haiti, etc). This in a way that is totally impossible to tag to changeset. Other than the showstopper above I also find the source tags of/on objects quite often _very_ useful for estimating the accuracy/reliability of the data in question. It also follows the data through extracts and various outside-the-OSM-universe use, which I think is a good idea. So, I see no good reason for tagging source to changeset (only). Cheers, -Jaakko Sent from my BlackBerry® device from Digicel -- Mobile: +509-37-26 91 54, Skype/GoogleTalk: jhelleranta -----Original Message----- From: Jean-Marc Liotier <[email protected]> Date: Wed, 19 Sep 2012 16:20:29 To: Martin Koppenhoefer<[email protected]> Cc: <[email protected]> Subject: [OSM-talk] Source as attribute of object or changeset ? [was: Re: Import guidelines & OSMF/DWG governance] 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 ? _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
