C=======================================================================C
C									C
	SUBROUTINE IJTOLL( I, J, CM, LTMX, RES, NS, NV, LAT, LNG )
C									C
C=======================================================================C
C									C
C   This subroutine determine the LAT/LNG location in a sinusoidal 	C
C   projection having a Central Meridian CM, maximum latitude LTMX,	C
C   RES deg/pixel, NS samples, and was subsampled by a factor of NV	C
C   at map location I,J.						C
C									C
C=======================================================================C
C									C
C	Version 1.0		T. Duxbury		20 July 2001	C
C									C
C=======================================================================C


	IMPLICIT NONE
	
C   Double precision variables

	DOUBLE PRECISION
     *		CM,		! Central meridian of sinusoidal projection, deg
     *		LAT, LNG,	! Mars-fixed latitude and longitude, deg
     *		LTMX,		! Maximum latitude of projection, deg
     *		RES		! Projection resolution, deg/pixel

C   Ingeger variables

	INTEGER
     *		I, J,		! Projection location of LAT/LNG
     *		NS,		! # Sample in projection
     *		NV		! Factor projection was sub-sampled (normally=1)
     
C   Compute the LAT / LNG location associated with I, J

	LAT = LTMX - DFLOAT( NV*(J-1) ) * RES 			! deg
	LNG = CM + DFLOAT( NV*(I-NS/2-1) ) * RES / DCOSD( LAT )	! deg

C   All Done - Return

	RETURN
	END