This module allows users to read in sorted ASCII terrain data and
generate an 2-D irregular field. Together with the "Draw Map" module on the
ftp site, users can create a 2-D terrain plot over the political boundary
map.

	Author:	Jeff Wang
		Information Technology Division, MCNC
		3021 Cornwallis Road
		RTP, NC 27709

	Input Data:	
		An ASCII file contains sorted terrain data in
		(Long, Lat, Zelev)

	Output Data:
		Field 2-D 1-Vector 3-Space Irregular

	Parameter:
	   Output Type: Choice options for Lat/Long or UTM

	Sample Data: 
	   Can be found via anonymous ftp to:
		csc.org:/sample_data/avs_data/Get_Terrain_Data/dma.dat