[Talk-GB] rendering locks

Dave F. davefox at madasafish.com
Sat Feb 27 20:40:02 GMT 2010


Hi Steve

Not sure why, but your post's got mixed up in another thread. You might 
want to repost so it doesn't get missed by others.

Steve Chilton wrote:
> Have submitted mapnik patches to SVN to render locks but unfortunately there isn't a standard way of tagging that makes it easy to be comprehensive.
> I have dealt with what I think are the two most logical options, which are:
>  
> two nodes with waterway=lock_gate at either end of a way tagged waterway=canal;lock=yes
>  
> and
>  
> single node with waterway=lock OR lock=yes (with lock-gates not mapped)
>  
> This seems to fit with http://wiki.openstreetmap.org/wiki/Key:lock
>  
> There are other variants in place (and I haven't look too hard).
> For instance at Tardebigge 
> http://www.openstreetmap.org/?lat=52.31229&lon=-2.03814&zoom=17&layers=0B00FTF
> there is  a variant to the east of Upper Gambolds bridge that has an extra node for the lock which will throw the submitted rendering.

>  
> Does anyone want to try to help me to get a simplified schema that will cover most options and allow sensible rendering?
> Yes, I know there are variants like lock pounds, and multiple locks whose top gate is the bottom of the next, etc.
>  
>   

I'm looking to get into the nitty-gritty of OSM. I've some experience in 
lisp,vba & XML/XSL. Where would I start to get an understanding of what 
to do in mapnik?

> I could go round changing any instances I find that don't match the two options above but would like any interested parties' thoughts first off.
>   

I'd go with the wiki page.

>  
> PS: deliberately not tried to render locks before because of inability to render icons (eg a traditional lock arrow) at the angle of the way they are on. So have used a round icon for the moment. Any thoughts on that welcome too.
>   

Have you looked at how osmarender renders locks?

http://www.openstreetmap.org/?lat=51.37718&lon=-2.35149&zoom=17&layers=0B00FTF

>  
> Cheers
> STEVE
>
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>
>   





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