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[mkgmap-dev] Commit: r1377: Limit length of lines to work around problems when subdividing long lines.

From Felix Hartmann extremecarver at googlemail.com on Wed Nov 11 23:49:42 GMT 2009

svn commit wrote:
> Version 1377 was commited by markb on 2009-11-11 21:25:03 +0000 (Wed, 11 Nov 2009) 
> Limit length of lines to work around problems when subdividing long lines.
> This is not the ideal solution but works as an interim fix until the
> real problem is solved.
> The fundamental problem appears to be that very long lines (national boundaries,
> etc.) can be segmented such that some of the line's segments fall outside
> the map area that the line has been assigned to. By chopping the line into
> segments before the line is assigned to a subdivision, the problem is
> avoided.
> This can't be done for polygons and so very large polygons can still
> yield errors.
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> mkgmap-dev at lists.mkgmap.org.uk
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I am not sure which of todays changes is responsible, but routing in 
Mapsource became a lot worse! Often I get routes 10-30% longer or on 
less priorised ways than before, this is a drastic example but happens 
on every 10 route:

Yellow route is old SVN 1773, pink is newest SVN version (yellow is 
17.8km and 33 minutes, pink is 26.5km and 56 minutes):

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