[OSM-talk] scanned map -> osm format

[Nick Black]

Automating the vectoriasation of maps is a pretty tricky business,
which hasn't really been solved.  If you google for "map
vectorization", you'll find a lot about the problem.  The basic
solution is to scan the map, create a greyscale image from the desired
roads (filter all non-blue to get motorways), then apply a
skeletonisation algorithm to derive vectors.  So far as I know, there
is now open source software to do this.  Converting to .osm wiould be
another story altogher, though once you had the data in a format that
could be read into PostGIS, it is quite straight forward to output OSM
MySQL SQL.

NIck


On 2/12/07, Graham Seaman <graham at theseamans.net> wrote:
> I'm referring to Italian town maps of very doubtful copyright status
> (ie. can't trace any explicit copyright status anywhere). I intend to
> use them on my own site where I would be the sole responsible for any
> copyright issues, and don't want to merge them in with the OSM dataset
> to avoid possible pollution problems, so I was looking for some kind of
> free-standing tool to handle the conversion.
>
> Graham
>
> Barnett, Phillip wrote:
> > I'm sure this email will set alarms off everywhere!!! :-)
> >
> > You are referring to an out-of-copyright map, of course? We cannot use
> > any copyrighted material in OSM.
> >
> > But you knew that anyway, yes?
> >
> > Cheers.
> >
> >
> >
> >
> >
> >
> >
> >
> > PHILLIP BARNETT
> > SERVER MANAGER
> >
> > 200 GRAY'S INN ROAD
> > LONDON
> > WC1X 8XZ
> > UNITED KINGDOM
> > T +44 (0)20 7430 4474
> > F
> > E PHILLIP.BARNETT at ITN.CO.UK
> > WWW.ITN.CO.UK
> >
> > -----Original Message-----
> >
> > From: talk-bounces at openstreetmap.org
> > [mailto:talk-bounces at openstreetmap.org] On Behalf Of Graham Seaman
> > Sent: 12 February 2007 11:04
> > To: talk at openstreetmap.org
> > Subject: [OSM-talk] scanned map -> osm format
> >
> > Hi,
> >
> > I'm sure this must be an FAQ but I can't find the answer anywhere: is
> > there any automated way to convert a scanned map to osm format? Or, if
> > it's not possible to fully automate, are there any tools for Linux which
> > will allow me to trace over a scanned map and save the output in osm
> > format? (I have a relatively clean map with just road outlines, and a
> > scattering of known gpx points to anchor it physically)
> >
> > Many thanks
> > Graham
> >
> >
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-- 
Nick Black
--------------------------------
http://www.blacksworld.net