[Talk-us] Boston Coastline leak? Re: Where next?

Peter Miller peter.miller at itoworld.com
Sun Feb 1 10:58:29 GMT 2009

On 31 Jan 2009, at 17:56, Bill Ricker wrote:

> On Fri, Jan 30, 2009 at 10:01 PM, Bill Ricker <bill.n1vux at gmail.com>  
> wrote:
>> On Fri, Jan 30, 2009 at 9:47 AM, Christopher Schmidt
>> <crschmidt at metacarta.com> wrote:
>>> just assumed it was a renderer problem instead of a data problem.
>> looks like it's both ?-)
>> can you or someone figure out what the fix is?
> seems to me that freshwater on the inland side of a dam with locks
> should not be natural=coastline, so i am adding waterway=dam,lock=yes
> to the Amelia Earhart Dam and converting the offending coastline
> polygons to waterway=riverbank. this may not fix watever the intrinsic
> problem is -     polygons seem rightway round, clockwise wet. I am
> unclear on how adjacent wet polygons should touch, maybe i should ask
> that on Newbies :-)

Coastlines, rivers and water are not really for newbies! There are a  
lot of traps to fall into and just to help osmrender and mapnik render  
things differently and have different time-delays until you can see  
the results!

Adjacent polygons should share one edge, although that it not possible  
with coastline which needs to be a single chain. I have sorted out  
some joins between bits if river and between river and coastline.

I have sorted some broken coastline including one long section that  
was the wrong way round to the north of Boston that wouldn't have  

I have connected the coastline is a few places where it was broken by  
bridges into two unconnected parts.

I have cleaned up some rivers and added a few new ones and added the  
'mystic' lakes.

Do be aware that the coastline viewer is complaining at present about  
a number of features are that probably ok because of the big error to  
the north. I think we now need to wait for the coastline viewer to get  
updated on monday at about 11:30UTC to see what else needs to be done.

I will have another go tomorrow.


Peter Miller

> -- 
> Bill
> n1vux at arrl.net bill.n1vux at gmail.com
> _______________________________________________
> Talk-us mailing list
> Talk-us at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/talk-us

More information about the Talk-us mailing list