elevation data

[Mike Bender]

> 
> I'm not sure about your problems with the dxf import.  But once you have
> your vector elevation data the way you want it.  Convert your vector
> lines to a raster in GRASS then use r.surf.contour to create a dem layer
> with the rasterized version of the vctor lines as your input.
> 

My problem with the elevation contours imported from dxf is that they
have no category labels!  There are 1000s of lines.  How on earth do I
retrieve this information.  I have seen the elevation data in the dxf
files associated with polyline information (each vertex has elevation
info).  Do people label each line individually based on finding the
vertex/node in the dxf file?  My dxf files are on the order of 10MB!
There must be a better way.

Mike Bender
University of Manitoba
mike at fids.ce.umanitoba.ca