[OSM-talk] Good practice for updating the source tag

[Dave Stubbs]

On Tue, Oct 14, 2008 at 9:04 AM, maning sambale
<emmanuel.sambale at gmail.com> wrote:
> Hi,
>
> What's the good practice for updating the source tag?
> For example in my mapping area, the initial coastline was from an SRTM
> import (source=SRTM), then somebody updated the coast using LANDSAT,
> then another user updated it using Yahoo!.
>
> I would very much like to preserve the original tag as it provides
> some history on the development of the data, but the data have been
> greatly modified that it does not in anyway similar to the original
> coastline import.
>

If you entirely move something to match another source then just
replace the tag.
If I modify something with reference to another source, but still
trying to take into account the original then I tend to add the source
to the tag, so source=SRTM+landsat or similar.
(sometimes I just forget it completely)

The way/node history on the OSM server takes care of preserving the
origins, so anybody who's interested can look back through it.

Dave