[HOT] bother adding source=Whatever to each object?

[Pat Tressel]

There was another thread relating to this a short while ago, so there's
more relevant discussion there.

Two notes:

The source tag can hold other info besides imagery, e.g. it could tell who
or what agency provided some item of information.  The iD imagery_used tag
is more specific.  But historically, source has been used for imagery too.

With respect to whether the source / imagery_used tag should go on features
or changeset:  I raised this question at the end of the previous thread on
this subject.  We don't want to lose the fact that something was traced
with use of a particular set of imagery if someone edits a feature.  Let's
take one specific case:  Say that someone enters a feature (say it's one
point, just to be clear) using one set of imagery, and the imagery_used tag
gets assigned to the changeset.  If someone later shifts that point, while
using a different set of imagery, is it still possible to get back to the
original changeset from the modified point?

-- Pat

On Mon, Nov 3, 2014 at 11:01 AM, Ray Kiddy <ray at ganymede.org> wrote:

> On Mon, 3 Nov 2014 19:51:52 +0100
> Sander Deryckere <sanderd17 at gmail.com> wrote:
>
> > It's more logical to put it on the changeset.
> >
> > Like when you draw a building, and add source=bing. But then someone
> > who lives there gives it a name, and forgets to alter the source, the
> > object has data that can't be derived from the source. So it's in
> > fact your edit operation that has a source, not the object itself.
>
> I had wondered about this when I saw multiple source values on an
> object. I mean, which other attributes came from which source?
> Technically the source should map to the subset of the attributes that
> were observed from that source, but in real life, I would have no idea
> how that could be presented in a way anyone would understand.
>
> > As such, source=Bing is by many mappers preferred on the changeset
> > (also because it keeps the database a bit smaller).
>
> > When you edit with JOSM, you can add the source manually as a tag to
> > the changeset (which is handy if your source is a survey or offline
> > source). In iD, it automatically logs the imagery used in the
> > changeset, but you don't get an option to give other sources (which
> > is why many people still put a source on the objects).
>
> So I understand this to mean that if you are putting in an object from
> the imagery in front of you, you do not need to do anything else. I am
> not seeing that iD is attaching this anywhere but I may not be looking
> in the right place. But as long as the database sees it, I do not need
> to.
>
> Take away point, I do not need to set the source 100 times and I am
> good with that.
>
> cheers - ray
>
> > Regards,
> > Sander
> >
> > 2014-11-03 19:41 GMT+01:00 Ray Kiddy <ray at ganymede.org>:
> >
> > >
> > > Hello -
> > >
> > > This is probably a somewhat basic question about editing for HOT
> > > tasks.
> > >
> > > As I have been editing in various HOT tasks, I have been adding
> > > something like source=Bing (where that is the imagery) onto every
> > > road, every building, every ... everything that I create. Need I
> > > bother with this?
> > >
> > > I have seen in (perhaps just some tasks') instructions that I could
> > > also just put this on the changeset comment. So I can just add it
> > > to the changeset once instead of adding it to the object 100 times?
> > >
> > > If it could be put on the changeset comment and not on every object,
> > > that would be convenient. It would also explain why, when I look at
> > > all of the objects others have created, I hardly ever see a source
> > > value.
> > >
> > > So, am I doing too much work by re-entering the source value every
> > > time? What is the level of diligence expected here?
> > >
> > > thanx - ray
> > >
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> > >
>
>
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