[Tagging] Where do source tags belong?

[ael]

On Mon, Jun 30, 2014 at 06:40:47PM +0200, Jo wrote:
> Just like everybody else I started several years ago by adding source tags
> on the objects themselves.

I changed to putting the source on to change sets, but hit a problem
with armchair-mappers.

I found armchair mappers overwriting carefully surveyed mapping with
inferior and often wrong "improvements". When I complained to them, they
pointed out that it was not feasible to locate all the changesets
and check the source tags. And I realized that was an impossible
burden.

So how is an armchair mapper to know that he/she is messing with
something already gps/ground surveyed and keep away unless the
source tag is right there where they can see it on the object?

I nearly gave up on OSM at one point when all my hard careful work
was completely destroyed by armchairs without local knowledge.

I haven't seen anyone else make this point. As far as I can see,
the only solution is to source-tag each object. Is there another
solution?

ael