[GRASS-user] Conditions under which v.drape would fail to find the nearest neighbor

[Alyre Chiasson]

Helo,

I was wondering if there are any conditions under which v.drape would 
fail to find a nearest neighbor contour line. My raster file which 
contains the contour lines were derived from a vector file using 
v.to.rast. The resulting rater file looks good. However, 5 out of an 
initial 8 trial data points returned zero as the third dimension even 
when it was obviously not the case. I was wondering if it gives up after 
searching around by a certain number of cells (window) or if you can set 
the search range.

Thanks

Alyre