[Talk-ca] Geobase related fixes needed in Mapnik and Maplint
Lennard
ldp at xs4all.nl
Thu Aug 27 20:07:58 BST 2009
Pierre-Luc Beaudoin wrote:
> Oh! Thanks for the enlightenment. Can't we improve it then to not
> render repeated signs for prettier map output? See the 360 on this map
> http://www.openstreetmap.org/?lat=47.1061&lon=-70.8097&zoom=12&layers=B000FTF
Every time mapnik encounters a new way, it takes it at face value, and
restarts the shield rendering and shield repeats along the length of the
way. As Richard pointed out, the min_distance is 120px, so it starts
rendering the first shield of the next way a minimum of 120 pixels away
from another shield.
Point is, to us it looks like one long way, and we would maybe assume
that a single shield would suffice, but to mapnik, it's a collection of
unique ways, each taken at face value.
Increasing the min_distance would introduce more problems where 2
shielded highways are close to each other.
Still, it's a nice idea, and would perhaps be possible either be
preprocessing the data in additional ways, or by enhancements to mapnik
itself. Needs someone to try, test and implement it.
--
Lennard
More information about the Talk-ca
mailing list