C+
C NAME:
C	Get2Dval
C PURPOSE:
C	2D linear interpolationInterpolates values from positions
C	specified as XC,XL (modified Carrington variable, latitude (deg)
C CATEGORY:
C	Data processing
C CALLING SEQUENCE:
	subroutine Get2Dval(XCbeg,XCend,nLng,nLat,F2D,N,XC,XL,FF)
C INPUTS:
C	(all input is read-only)
C	nLng		integer		# longitudes
C	nLat 		integer		# latitudes
C	F2D(nLng,nLat)	real		2D array (longitude, latitude)
C	N		integer		# points
C					
C	XC(N)		real		Modified Carrington variable
C	XL(N)		real		Heliographic latitude (deg)
C OUTPUTS:
C	FF(N)		real		Interpolated function values
C CALLS:
C	FLINT
C INCLUDE:
C	include		'mapangles.h'
C PROCEDURE:
C >	The modified Carrington variable is mapped to the range [1,nLng]
C	The latitude is mapped to the range [1,nLat]
C	The distance is mapped to the range [1,nRad]
C >	For each point, if any of the neighbours contains a bad value, or if any of the
C	coordinates is more than one bin width outside the index ranges, then the value
C	BadR4() is returned (see FLINT).
C MODIFICATION HISTORY:
C	MAY-1997, Paul Hick (UCSD; pphick@ucsd.edu)
C-
	    real	F2D(nLng,nLat)
	    real	XC(N)
	    real	XL(N)
	    real	FF(N)

	integer		ND(2)
	real		PP(2)

	include		'mapangles.h'

	nLng1 = nLng-1
	nLat1 = nLat-1

	ND(1) = nLng
	ND(2) = nLat

	do I=1,N
	    PP(1) = XCvar(XC(I))
	    PP(2) = XLindx(XL(I))
	    FF(I) = FLINT(-2,ND,F2D,PP,0.00002)	! Minus sign forces check for bad values
	end do

	return
	end