[mkgmap-dev] Problems with sea in overview map

Mon May 24 15:38:43 BST 2021

Ah

When I scanned this area a while ago I guessed, without looking
carefully or thinking, that mergeShapesFirst took all the shapes from
all the ovm_ imgs and attempted to merge them. I see now that it
doesn't. I don't know what problem it can solve better than the
standard subdivision merge. It might have been there because, a long
time ago, outer zoom subdivs (esp. overview) were far too small when
there was anything (sea/coastline) because the content #points was
calculated at res24. 

So, yes, I'd try without.

Ticker

On Mon, 2021-05-24 at 14:19 +0000, Gerd Petermann wrote:
> Oops, I meant
>  should I remove mergeShapesFirst() completely?
> 
> Gerd
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Gerd Petermann <gpetermann_muenchen at hotmail.com>
> Gesendet: Montag, 24. Mai 2021 16:07
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Problems with sea in overview map
> 
> Hi Ticker,
> 
> you mean I should mergeShapesFirst() completely?
> 
> 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 15:57
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Problems with sea in overview map
> 
> Hi Gerd
> 
> Not sure about this. It is a very drastic change and might break a
> lot
> of the element>subdiv code (esp --order-by). Many element well be too
> big and have to be split again.
> 
> It ends up as a merge attempt at all lines/shapes in the tile, so it
> might as well be resolution independent!
> 
> Ticker
> On Mon, 2021-05-24 at 13:33 +0000, Gerd Petermann wrote:
> > Hi Ticker,
> > 
> > I think I found my mistake. The code to re-calc the preserved
> > points
> > was executed for each sub division instead of once per level.
> > 
> > The attached patch might already solve this.
> > 
> > Gerd
> 
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