Hello, 

there is no specification for the type of the "shape" attribute of
<lane> element in the net file
(http://sumo.dlr.de/wiki/Networks/SUMO_Road_Networks), only that it is a
"position vector", which is not specified in the notation page
(http://sumo.dlr.de/wiki/Basics/Notation). 

The wiki gives example of lane spec: 

 <lane id="<ID>_0" index="0" speed="<SPEED>" length="<LENGTH>"
shape="0.00,495.05 248.50,495.05"/> 

which looks like its a vector of <2D-POSITION> type separated with blank
spaces. Am I correct? If so, how is the altitude encoded there?
Thank you,
~Matej 
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