[mkgmap-dev] Include the following patches into trunk -- Patch4 - decrease douglas peucker errorFrom Johann Gail johann.gail at gmx.de on Fri Mar 4 20:29:48 GMT 2011
Am 03.03.2011 22:56, schrieb Felix Hartmann: > > On 03.03.2011 22:37, Felix Hartmann wrote: >> For lines it works perfect. But somehow polygons really get munged and >> destructed (lots of straight line holes - that are fewer without this >> patch). >> >> Could you check what is going on for polygons? For polygons the old >> algo should be used, it looks like it would be even worse than the >> straight line algo has ever been before. > Sorry, for my complaint. Polygons are nice up to level 21. But really > bad from level 20 down. The new aggressive filter should only be for > lines, not for polygons as it does not work well for them. > As for lines it does work well though. > No idea, what goes wrong in your case. I didn't expect big differences for polygons at resolutions <=20. In my test cases there I can't see any difference. I have just tested. Polygons looks a bit ugly with or without the recent change. I know, that the dp filter is not really optimal for cleaning up polygons in general. Maybe needs an other approach... Johann
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