Hey Michaël,
I was using "intersect", and I tried "crosses", but that didn't work. I'm
taking a look at relate now, although I'm having a hard time deciphering
DE-9IM.
-lreeder
On Sat, Sep 20, 2014 at 1:38 PM, Michael Michaud <
m.michael.mich...@orange.fr> wrote:
> Hi Larry,
>
> Do you compute relations between geomeries with intersect predicate ?
> I wonder if you could remove edges between polygons adjacent at one point
> from the graph by using relate operator (which makes it possible to check
> intersection dimension).
>
> Michaël
>
> Hey Jukka,
>
> Just got a chance to look at this. The region that is not coloring is
> interesting.
>
>
>
> It's like a pizza sliced into six pieces, each touching at the point.
> You can't color this portion of the map with only five colors without two
> adjacent (maybe just adjacent at one point in the enter) regions having the
> same color. In graph-theory terms, the graph is "non-planar" and can't be
> colored correctly with the five-color theorem. The map coloring plugin
> detects this and refuses to color this portion of the map.
>
> From a practical standpoint, you probably don't care that regions
> touching at a single point have the same color, as long as they don't share
> a color along a long edge. I'll look at updating the plugin to detect
> this and continue coloring.
>
> -lreeder
>
>
>
> On Mon, Sep 15, 2014 at 7:15 AM, Rahkonen Jukka (Tike) <
> jukka.rahko...@mmmtike.fi> wrote:
>
>> Hi,
>>
>> I found a shapefile from which some polygons are not colored with the Map
>> coloring plugin v. 0.4. Shapefile does not have topology errors but some
>> multipolygons have quite a many parts because of archipelago. However,
>> exploding multipolygons into polygons does not change the behaviour. The
>> problematic shapefile can be found from
>> http://latuviitta.org/downloads/ojmapcolor_error.zip
>>
>> Error appears always in the same place in South-West. For example
>> features with OGR_FID=180 or 234 stays without color.
>>
>> -Jukka Rahkonen-
>>
>>
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>
>
>
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