[OSM-dev] Mapnik rendering of mountain_pass = 'yes'

Tom Hughes tom at compton.nu
Wed Oct 8 08:51:53 BST 2008

Stefan Wenk wrote:

> The problem is that according to the defintion the "mountain_pass" tag applies 
> to nodes, not to ways. Therefore the rendering uses an icon. The icon would 
> need to be rotated according to the direction of the way at the specific 
> node, which is tagged with mountain_pass='yes'. 

There are a number of things which need this, but it isn't something 
that mapnik can do at the moment.

> Are there other possilities and what is the best method of addressing this 
> issue?

Enhance mapnik to support this concept - it probably means allowing 
point symbolizer to specify that an icon should be aligned at a 
particular angle. The angle could either be computed by the point 
symbolizer itself by allowing it to refer to a line geometry that gave 
the angle or it could be precomputed in the SQL somehow.


Tom Hughes (tom at compton.nu)

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