[OSM-talk] Deleting data
bryce2 at obviously.com
Wed Oct 23 08:11:00 UTC 2013
On Sat, Oct 19, 2013 at 6:48 AM, Russ Nelson <nelson at crynwr.com> wrote:
> > As a mapper, you have mapped from third party sources and not been in
> > the place physically to confirm. But you expect other mappers to have
> > a different threshold for deleting these edit, why?
> Because they are not an expert. Sorry, they're not. You have to use
> multiple sources to find a railroad right-of-way. You can't just look
> at a leafed-over aerial photo (as above), or an aerial photo where you
> can't identify the railroad remains.
As a person who has traced far more than the average number of dead
railroads, on foot
or by mountain bike or canoe: I agree. It takes an expert.
But this also means a non-expert could well* actually visit the area* and
miss the subtle signs
of the former railroad. The curved wall of the factory probably has a
parking lot below it now,
with a truck loading dock, yet you expect an average mapper to realize the
It seems the real issue is the use of OSM for barely observable former
features. A shiny new
loading dock, rail trail, or light rail system is mappable by anyone.
Historic features are more problematic. At what point does a railroad stop
When the rails are taken away? The ballast? The piers and footings? When
building is built on the old roadbed? What if the railroad was moved a few
feet, do both routes get mapped?
With better tagging the editors could help, distinguishing between features
and features that are no longer (or barely) observable. But this is
basically a history discussion,
not so much one about uncaring deletions.
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