This module allows users to draw lines in the geometry viewer.
The value of the line is mapped into color by the colormap of AVS.  The input 
field is a 1D 6 space field with (x0, y0, z0, x1, y1, z1, value).  The 
denomitor "0" means the starting points of the links, while "1" means the
ending points of the links.

	Input Data: Field 1-D 6-Space 1-Vector IRREGULAR
                    Colormap (Optional)

	Output data: Geom

	This module belongs to a group of modules submitted to the Inter- 
national AVS Center for displaying points, lines and polygons over a map of the
United States. The group of the modules includes:

	AFSextract: 	 	Extracting AFS Format Data
	AMSextract:		Extracting AMS Format Data
	LBFextract:		Extracting Link Base Mobile Data
	field_to_points:	Plot 3D points with color mapping
	field_to_lines:		Plot 3D lines with color mapping
	field_to_polygons:	Plot 3D polygons with color mapping
	getmap:			Plot political boundary of states and
				countys in the United State
	geomreset:		Reset and normalize the geometry viewer
				automatically
	zoomer:			A driver to allow zoom in and out to a 
				particular geographical area
	resetlegend:		To reset the position and size of ithe color 
				legend if usedirregulr
	minmax:			To find out the min and max value of a field


	An example network is shown below:

			
				read field
			 	   |
 	generate colormap ----- field to lines
				   |
				geometry viewer
				   |
				geom reset 


	Contact person: Jeff Wang, MCNC/NCSC, (919)-248-9242

This is one of a suite of modules we used to plot the emission 
data for the state of North Carolina.  This group of modules allows 
displaying points, lines and polygons over a map of the United States. 
The module suite is stored as a group in a compressed tar file at the
International AVS Center, with some sample networks and datasets included.
You may find it easier to access the modules this way.  The compressed tar
file is approximately 1.2MB in size, and can be found via anonymous ftp to
avs.ncsc.org, in /sample_data/avs_data/Wang_GIS_mods.tar.Z.