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PURPOSE:	Transforms input Easting and Northing to longitude and
		latitude for the Lambert Azimuthal Equal Area projection.  The
		Easting and Northing must be in meters.  The longitude
		and latitude values will be returned in radians.

PROGRAMMER              DATE            
----------              ----           
D. Steinwand, EROS      March, 1991   
S. Nelson,EROS		Dec, 1993	changed asin() to asinz() because
					NaN resulted expecting poles.

This function was adapted from the Lambert Azimuthal Equal Area projection
code (FORTRAN) in the General Cartographic Transformation Package software
which is available from the U.S. Geological Survey National Mapping Division.
 
ALGORITHM REFERENCES

1.  "New Equal-Area Map Projections for Noncircular Regions", John P. Snyder,
    The American Cartographer, Vol 15, No. 4, October 1988, pp. 341-355.