[mkgmap-dev] Problems with sea in overview map

Mon May 24 17:00:53 BST 2021

Hi Gerd

This seems to be false when combining the ovm_, rather than when
generating them!

It suppresses RoundCoords but maybe shouldn't. Not sure why RoundCoords
should ever be suppressed when res < 24?

It doesn't suppress removeObsolete, which removes points in any
straight line. 

I suppose the simpler way to view this is that unique points per
element on the tile boundary should be kept; making the job of the
overview combiner mergeShape possible.

Ticker

On Mon, 2021-05-24 at 15:35 +0000, Gerd Petermann wrote:
> Hi Ticker,
> 
> yes, it is. See usage of enableLineCleanFilters
> 
> Gerd
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Ticker Berkin <rwb-mkgmap at jagit.co.uk>
> Gesendet: Montag, 24. Mai 2021 17:33
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Problems with sea in overview map
> 
> Hi Gerd
> 
> Not quite related, but if merging the shapes from all ovm_ imgs, then
> maybe some types of filtering should be turned off when the contents
> for these is being generated; esp DP, and probably straigh-line
> removal
> in removeObsolete
> 
> Ticker
> 
> On Mon, 2021-05-24 at 15:21 +0000, Gerd Petermann wrote:
> > Hi Ticker,
> > 
> > sorry, I can't follow. The old code only preserved points on the
> > boundary of the merged shape, but the outer ring can be far from
> > rectangular.
> > This way some important points on outer ring were not preserved.
> > 
> > There's still a possible problem with large white area in sea which
> > seems to depend on the order in which shapes are merged. Sill
> > trying
> > to understand what goes, but at least I can reproduce it...
> > 
> > Gerd
> > 
> > 
> > ________________________________________
> > Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> > von Ticker Berkin <rwb-mkgmap at jagit.co.uk>
> > Gesendet: Montag, 24. Mai 2021 17:11
> > An: Development list for mkgmap
> > Betreff: Re: [mkgmap-dev] Problems with sea in overview map
> > 
> > Hi Gerd
> > 
> > Re. last commit: preserve all horizontal and vertical lines in
> > shapes.
> > 
> > Do the cut lines go right across the outer polygon or just in from
> > one
> > side to the hole? If all the way across, might this change inhibit
> > the
> > merging to one side of the hole, or, if divided for some other
> > reason
> > in the other direction, merging across the now unneeded cut line.
> > 
> > Ticker
> > 
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