On Sunday, June 19, 2011 at 20:27 CEST,
Magnus Bäck <[email protected]> wrote:
> I'm using Mapnik with OSM data and my own GPS tracks to render
> high-resolution PNG images of my travels. I've converted the
> original GPX file of a long train ride into a shapefile and
> added it to a layer of the map with a line symbolizer.
>
> Unfortunately, in a number of places the track is crossed by
> a line that appears to be perpendicular to the track. A low
> resolution cropped sample of what it looks like can be found
> at http://elwood.jpl.se/~magnus/crossed-track.png.
FWIW, filtering out adjacent points that are <100 m apart made
the map render perfectly with no crossing lines. I didn't need
any better resolution anyway. Still curious to know why I got
the described behavior in the first place though, and to know
if there's any way to avoid it without preprocessing the data.
--
Magnus Bäck
[email protected]
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