[OSM-talk-be] Blackspots

[Ben Abelshausen]

We use a matching algorithm that still recognizes streets with small
spelling errors and takes into account derivations like st. and straat.
Spelling shouldn't be a problem.

I'll see if I can prepare the data in a good format for you. Also an update
mechanism would be nice. After updating osm blackspots should dissappear!
:-)

The updates will be max daily.

If you can do all this that would be great! It's not that urgent so take
your time!

Regards,


Ben


On Fri, Oct 14, 2011 at 6:39 PM, Jan-willem De Bleser
<jw at thescrapyard.org>wrote:

> I think I understand :)
>
> On Fri, Oct 14, 2011 at 18:16, Ben Abelshausen
> <ben.abelshausen at gmail.com> wrote:
> > ...If no street with
> > the same name can be found the closest street is taken.
> >
> > This all returns a distance and then we filter all these that have
> distances
> > higher than let's say 50m. This gives us a good estimate of where roads
> are
> > missing!
> >
>
> This'll help avoid spelling mismatches, but doesn't it mean that a
> missing address won't show up in the heat map if it's within 50m of
> any other street, even the wrong one? Any idea if this is a
> significant problem? Say, for example, addresses on a city alley
> missing from OSM but near another street?
>
> > I can share lat/lon/distance records that we use to generate the
> 'heat'maps.
> > I think there are about 50000 with a distance > 50m. The records will
> have
> > no address data (postalcode, street, housenumber), that is the part i am
> not
> > supposed to share.
>
> So, a table of lat/lon/dist values where you know of an address but no
> street is nearby, from which we can generate heatmaps. It should be
> small enough to throw up on a website somewhere, and then we just need
> a script to do the rendering. I'd be interested in working that out
> (probably possible with GDAL or similar) but I'm away next week so it
> won't be for right away.
>
> Cheers,
> Jw
>
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