[OSM-talk] linz dataset for nz - attribution methods summary

[Cartinus]

On Wednesday 02 April 2008 12:02:49 Robin Paulson wrote:
> On 02/04/2008, Cartinus <cartinus at xs4all.nl> wrote:
> >  > there's no reason (in theory) the person carrying out the import of
> >  > the second, or third, or whatever, 'approved' source, couldn't
> >  > temporarily be given write-status for that tag. it was only intended
> >  > to be read-only for the majority of users, who editing/adding things
> >  > one component at a time
> >
> > This would need people in charge of granting rights to other people.
> > Which I don't think is part of the spirit of OSM at the moment. (That's
> > part of the
>
> well, it happens already. there are parts of osm that i don't have
> access to, and if i asked steve or anyone else with the keys, they
> would likely say no unless i had a good reason. ok, it's the
> infrastructure not the data, but the point still stands

I think we have to agree to disagree on this point, because IMHO there is a 
big difference between the data and the infrastructure.

> >  unwanted part.) Plus it still wouldn't prevent me from using the "delete
> > and recreate" method if I wasn't granted those rights. (That's the futile
> > part.)
>
> true, but as i suggested in a previous mail, i'm not sure why someone
> would need to do this. if a user is importing another dataset which
> needs attribution, they would likely be someone responsible/trusted,
> and given temporary rights to add to the 'attributions' tag.
>
> who else would need to edit it? i can't see a situation where anyone
> would feel a need to delete and then re-create? what would they gain,
> in real terms?

You probably can't see the need because you are currently not editing in an 
area that is peppered with nodes that contain a "source=AND" tag. Why would a 
node that I moved a bit and changed into a "highway=bus_stop name=*" still be 
attributed to wherever it was imported from first? Why would a lake where I 
changed the east bank according to Yahoo aerial images or my own GPS tracks 
still be attributed to wherever it was imported from first? Etc., etc., etc.

Maybe the linz data is vastly superior to the AND data, but if it is not, then 
it is going to require a lot of manual correcting. Not to mention that even 
for nodes/ways that are correct, people probably want to add tags about 
things not present in the linz data to many of them.

Since a tag on an object applies to the whole object, in no time 
the "attribution" tag no longer reflects the "truth". Tags that don't reflect 
the "truth" generally are deleted as soon as anybody notices them.

The real gain is that if I go with a fine toothcomb over (a part of) a town to 
make it "feature complete", then it shouldn't say in the database that three 
quarter of the _objects_ are sourced from wherever, if only about one quarter 
of the _data_ actually comes from that source.


-- 
m.v.g.,
Cartinus