[postgis-users] Topology: Simplifying Coastlines with Islands

[Michiel J. van Heek]

Quoting Sandro Santilli <strk at keybit.net>:

> On Mon, May 28, 2012 at 02:50:43PM +0200, Michiel J. van Heek wrote:
>> Quoting Sandro Santilli <strk at keybit.net>:
> ...
>> >How do your country boundaries look now ? :)
>>
>> They look pretty good. Most remaining trouble edges are relatively
>> short. Three long coastlines remain problematic: arctic Canada,
>> southern/eastern USA, and Brazil. (Red color in attached
>> screenshot.) Probably because they have some quite large islands
>> very close to the coastline.
>
> "Probably" ? Dissipate any dubt, take a closer look !
> Pick the Brazil coast, looks interesting.
> Zoom in, see the edge which was colliding in the ST_ChangeEdgeGeom
> error message.

The collisions that struck me this morning: for the US east coast it  
was Long Island, NY. And for the coast of Brazil it was the island of  
Afua. But I will take another look, and send you some screen shots  
tomorrow, when I am at my other computer.

Michiel