Binary Image

The OPC FITS file contains one or more binary images captured by the camera for the purpose of assisting in the determination of GBT pointing characteristics and possibly closed-loop measurement and control.

The header keywords for the binary images are as follows:

XTENSION= 'IMAGE   '           / IMAGE extension
BITPIX  =                  -64 / number of bits per data pixel
NAXIS   =                    2 / number of data axes
NAXIS1  =                  479 / length of data axis 1
NAXIS2  =                  479 / length of data axis 2
PCOUNT  =                    0 / required keyword; must = 0
GCOUNT  =                    1 / required keyword; must = 1
END