[mkgmap-dev] Proof of concept for better sea in overview map

Mon Jun 7 10:26:03 BST 2021

Hi Gerd

This is going to take some studying to work out the implications. Can't
do much for the next few days however, but will look carefully at the
end of the week.

Ticker

On Sun, 2021-06-06 at 14:02 +0000, Gerd Petermann wrote:
> Hi,
> 
> the attached patch improves the overview map, but so far only when
> precomp-sea is NOT used. 
> I tested it with --generate-sea=multipolygon,floodblocker  so that
> mkgmap really has a multipolygon with the natual=sea data.
> 
> For each level in the overview map it uses the original multipolygon
> data to compute the rings which will might visible at the given
> resolution. This requires more time compared to the current code but
> the result is much better and some fine tuning is possible.
> 
> To be able to use this also with --precomp-sea we need some changes
> in the code which generates sea.zip so that one multipolygon relation
> for each tile is stored. 
> 
> I've uploaded the results here: 
> https://files.mkgmap.org.uk/download/511/compare.7z
> What do you think?
> 
> Gerd
> 
> 
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