This module allows users to extract data from AIRS AMS (AIRS Area and
Mobile Subsystem) files.  The AIRS AMS format are refered to User's Guide For 
the Urban Airshed Model, EPA-450/4-90-007D. Users may read through the very 
begining of the C codes provided to get an idea how the data is constructed.

	Input Data: Name of the AMS File   

	Output data: Field 1-D 4-Space 1-Vector IRREGULER
                    Which contains (x, y, z, n, value) 
                    where (x,y,z) is the coodinate of a vertex
                                  for a particular polygon (area)
                          n is the number of vertices of the polygon
                          value is the property value for that polygon

	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:

			
				AMSextract
			 	   |
				write field


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