"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
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Mobile: +509-37-26 91 54, Skype/GoogleTalk: jhelleranta
-Original Message-
From: Jean-Marc Liotier
Date: Wed, 19 Sep 2012 16:20:29
To: Martin Koppenhoefer
Cc:
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 ?
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