Hi Gerd Just noticed that I didn't reply to the list either! I need to change mergeShapes so that it only re-joins polygons that got split by MultiPolygonRelation, because the sorting has to be by original area, otherwise, across a subdivision join, areas might be in different order. The gmapsupp.img is 0.2% bigger (probably mostly the effect of not doing mergeShapes) When I've changed mergeShapes I need to tidy up my changes and remove quite a lot of diagnostics and I'll post a patch Regards Ticker On Sat, 2016-09-10 at 15:40 +0000, Gerd Petermann wrote:

Hi Ticker,

sorry, just noted that I did not reply to the list. Why do you have to disable the mergeShapes? What is the effect on img size? I don’t have much time for mkgmap now as I am working on some patches for JOSM. Feel free to post Patches to the list, maybe others like them, too.

Gerd

Von: Ticker Berkin Gesendet: Samstag, 10. September 2016 17:31 An: Gerd Petermann Betreff: Re: AW: [mkgmap-dev] Large polygons and subdivisions

Hi Gerd

I've done this and haven't found any side effects yet. I had to track the original full area of polygons and sort on this (and disable MapBuilder.mergeShapes). It seems to fix the problems I was having.

Ticker

On Fri, 2016-09-09 at 15:27 +0000, Gerd Petermann wrote:

...

Hi Ticker,

Yes, that’s what is happening and I hink it is intended. You may try to add code that cuts the polygons when subdivs are split in MapSplitter, but maybe this will have side effects.

Gerd

Von: Ticker Berkin Gesendet: Freitag, 9. September 2016 17:06 An: mkgmap development Betreff: [mkgmap-dev] Large polygons and subdivisions

Hi

I'm getting inconsistent displays in, for example, an area with woods and a large sports area, also area of wetland with many lakes (not expressed as outer/inner relation).

From my reading of the code, the problem occurs where the larger polygon crosses a subdivision boundary. It seems that its full area is allocated to just 1 subdivision, even though it might span many.

In the subdivision to which the large area is allocated, it is drawn first, then the small areas are drawn, overwriting nicely (because the shapes in the subdivision have been sorted by decreasing size). But in an adjacent subdivision the small areas are overwritten.

Shouldn't polygons be split on subdivision boundaries? I can't see any code that does this.

Regards Ticker Berkin

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