[mkgmap-dev] shape merger in high-prec-coord branch

Thu Jan 16 20:09:17 GMT 2014

Hi WanMil,

yes, a few more shapes were be merged because of this change.
Only if the parts go into different sub divisions they are not merged.
I am not sure if that works for precompiled sea data, I'll 
verify that tomorrow.

Gerd

WanMil wrote
> Hi Gerd,
> 
> good! This is the first part of my idea.
> Additionally I thought about what you have written as TODO: maybe better 
> merge here? I think when cutting multipolygons it often happens that 
> there are parts cut off that needn't be cut.
> I have attached a screenshot of a sea tile where I have colored some 
> polygons in blue that could be merged to one big polygon. Maybe there is 
> an advantage that some of the small cuts do not disappear on lower zoom 
> levels because they belong to a bigger polygon.
> 
> But I am not sure if that isn't already solved by your changes.
> 
> WanMil
> 
>> Hi WanMil,
>>
>> please check the changes in r2970 reg. MultiPolygonRelation.
>> Is this the change you had in mind?
>>
>> Gerd
>>
>>  > Date: Wed, 15 Jan 2014 21:55:17 +0100
>>  > From: 

> wmgcnfg@

>>  > To: 

> mkgmap-dev at .org

>>  > Subject: Re: [mkgmap-dev] shape merger in high-prec-coord branch
>>  >
>>  >
>>  > > I think the artifacts are created by the rounding that happens
>>  > > when we convert from or to java.awt.geom.Area.
>>  >
>>  > Yes. After the multipolygon splitting only the first and the last
>> point
>>  > of a common edge of two polygons can be a point that is added
>>  > artificially. It sounds possible to detect if it ca be removed.
>>  >
>>  > WanMil
>>  > _______________________________________________
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> mp_merge.png (16K)
> &lt;http://gis.19327.n5.nabble.com/attachment/5793366/0/mp_merge.png&gt;

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