[mkgmap-dev] patch to write polygons in decreasing order

Fri Nov 11 16:29:25 GMT 2016

Hi Ticker,

Ticker Berkin wrote
> I think the reason why the buildings look different is because, without
> --order-by-decreasing-area, they get merged into a single area and then
> a filter (DouglasPeucker), finding the intermediate points are within
> the tolerance of a straight line, removes all but the 4 corners of the
> complete block. With --order-by, they are output individually as
> accurately as possible, but, because we are at/beyond at the limit of
> accuracy, rounding effects become obvious.

forgot to reply on this. You are right, only it's not DouglasPeucker but  
RemoveObsoletePointsFilter which removes the nodes at resolution 24. 
(DP filter is skipped also for shapes at res 24)

Gerd

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