ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

E.3. USING FITS IN CIA – NEW PROBLEMS 333
E
Z
N
Z
α
α
N
LW !order = 1
rot(reverse(image,roll))
E
SW !order = 1
rot(image,roll)
N
E
α
α
E
Z
LW !order = 0
rot(image,180-roll)
N
Z
SW !order = 0
rot(reverse(image,180-roll))
Figure E.4: The roll angle α for each detector and for each value of the IDL !ORDER system
variable. The IDL command to rotate an image to the standard astronomical convention is
shown for each case. Note that the ROT function rotates clockwise.