SURFLIB_CALC_IJPOS - Calculate the position of data on an XY grid

Description:

Given an XY position, calculates the IJ position in the grid. The I,J's are then placed into the output array (of dimension 2, N_PTS)

Invocation:

CALL SURFLIB_CALC_IJPOS (N_PTS, PIXEL_SZ, I_CENTRE, J_CENTRE, X_POS, Y_POS, IJ, STATUS )

Arguments:

N_PTS = INTEGER (Given)

Number of X,Y pairs supplied

PIXEL_SZ = DOUBLE (Given)

Size of each pixel (radians)

I_CENTRE = INTEGER (Given)

Location of reference pixel in X

J_CENTRE = INTEGER (Given)

Location of reference pixel in Y

X_POS = DOUBLE PRECISION (Given)

X positions

Y_POS = DOUBLE PRECISION (Given)

Y positions

IJ ( 2, N_PTS ) = INTEGER (Given)

Positions of each point (I,J) in output grid

STATUS = INTEGER (Given & Returned)

Global Status

Copyright

Copyright ©1995,1996,1997,1998,1999 Particle Physics and Astronomy Research Council. All Rights Reserved.