[OSM-talk] scanned map -> osm format

[Graham Seaman]

Nick Black wrote:
> 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.  
OK, I've done that and now see why it's such a problem - I wasn't 
thinking before!

> 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.
Well, I'd already done the first steps (followed by thresholding to give 
me a plain binary image). It sounds like the best way to go from there - 
given that these aren't very large maps - is to manually trace the 
centre of roads /paths to get the vectors. Is there any particular 
(*nix) software you'd recommend for that, that would simplify reaching 
my goal of an osm format output?

(I know it sounds like it would be simpler using gps but the problem is 
that most of the ways in the town(s) are narrow and run between 
high-sided buildings - signal strength is nil or gives very bad resolution)
>   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.

What input formats does postgis accept (I've never used this and their 
link to documentation is returning a 'bad gateway' message)

And Mysql????  I'm guessing just a cut-and-past remainder?
 
Thanks for the advice!

Graham
>
> 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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