[Tagging] source tag on object <> changeset

[Marc Gemis]

Hi Ralph,

in which cases do you check the history ? If I have a photo (or any
other survey material) that show a different reality than what is
mapped, why would I then check the source ?
It's only when I have no survey material (and I'm armchair mapping
from e.g. aerial imagery ) that a source might be handy. Although I
find the date of the mapping/source is more important  (so it's good
that you add that, I do the same BTW).

BTW, armchair mapping can also happen when you add e.g. sheds that are
not visible from the road, but only on aerial imagery. Even when you
surveyed the road.
Armchair mapping is also done by anyone remotely checking other's
work, e.g. checking the work of new mappers, checks performed by DWG,
etc. For this type of work sources are probably useful, but for
someone purely mapping survey material ?

regards

m

On Tue, Jul 25, 2017 at 9:01 AM,  <ralph.aytoun at ntlworld.com> wrote:
> Hi marc,
>
>
>
> I am one that checks both the source and the history of changes to
> understand why a features was created and from where.
>
>
>
> JOSM does already have a history and can be accessed by selecting the
> feature then holding down the Ctrl key and pressing h. The history comes up
> in a separate window with the changesets as well.
>
>
>
> Source tags are very useful especially if done correctly. I rate a GPS,
> Field Survey or Local Knowledge quite high because it means someone has
> actually been there and seen it. I add the date of my visit to a place in my
> changeset comment for that reason. It also helps to identify how old my
> knowledge is. The date of change I can also get from Ctrl + h. The
> background imagery (Bing) can be anything up to 6 years old in many places
> and at best about 2 years old so it is not reliable for up-to-date
> information.
>
>
>
> Sent from Mail for Windows 10
>
>
>
> From: marc marc
> Sent: Saturday, July 22, 2017 11:11 PM
> To: Tag discussion, strategy and related tools
> Subject: [Tagging] source tag on object <> changeset
>
>
>
> I create a new thread because it have no link with a tree :-)
>
>
>
> Le 22. 07. 17 à 22:20, ael a écrit :
>
>> On Sat, Jul 22, 2017 at 08:51:16PM +0200, Simon Poole wrote:
>
>>> a) good practice to tag source on the changeset.
>
>> I always include a fairly comprehensive list
>
>> of sources on changesets, but *need* individual source tags
>
>> on objects. Otherwise, subsequent mappers come along with
>
>> far inferior information and wipe out my many hours/days/years of
>
>> careful work on the ground.
>
> This problem exists for any tag. Where does the localization for a
>
> crossing come from? Gps / aerial? What is the date of this ?
>
> I don't imagine that we triple all the tag to have source+date just in
>
> case someone doesn't read changesets when he thinks that an object needs
>
> improvement.
>
> If he doesn't read changesets, will he pay attention to your source tag?
>
> In my edit, I delete often previous source tag.
>
> Because if I modify an object after survey, a previous source=bing for
>
> example on an object no longer say anything usefull.
>
> I don't add source tag on object for the same reason.
>
> What would be useful is to have a link beside each tag indicating the
>
> last changeset that touched it.
>
> Or maybe a josm plugin can parse the history of the object
>
>
>
> Regards,
>
> Marc
>
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