Question about road display

<html><div style='background-color:'><DIV>I&nbsp;'ve successfully created 3D 
terrain by using Visad. Now,&nbsp;I want to draw a road on 3D terrain. The 
road&nbsp;will be&nbsp;realized by drawing line between vector point.(Here, I'm 
going to use Gridded3DSet) But the vector point information that&nbsp;I readed 
from a special file(VMAP) only includes X and Y value, no Z value(elevation 
value). How can I draw the road up and down along with the 3D terrain.(Not just 
float on the 3D terrain) If I can get Z values from the 3D terrain according to 
X,Y values, I may can draw a road as what I thought. But I have no idea about 
how to retrive Z values from the 3D terrain.</DIV>
<DIV>If you can give me any suggestion, I will be very thankful.</DIV>
<DIV>&nbsp;</DIV></div><br clear=all><hr> <a 
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