During PODPS pipeline calibration, several GEIS format data sets are created for the Wide Field Planetary Camera (WF/PC). They are: the Standard Header Packet, a Science Image file, and Science Image Data Quality file, an Extracted Engineering Data file, and an Extracted Engineering Data Quality file. Each data file consists of an ASCII header file and a binary data file. All files from a given observation have the same root file name; the type of information contained in each file is distinquished by its extension (see Table 1).
CALWFP provides routine calibration in both SOGS/PODPS Routine Science Data Processing (RSDP) and IRAF/STSDAS. CALWFP performs a standard sequence of processing steps on individual WF/PC camera observations designed to remove most of the known instrumental signature. CALWFP does the AtoD fixup, determines and removes the global bias level, subtracts bias, preflash, dark, and superpurge frames (after appropriate scaling), and applies the flat field frame. The Calibrated Science Image Data Quality file flags all pixels flagged in the Science Image Data Quality file and all pixels found to be saturated, to have known bad pixels (static mask), and to have been flagged in the DQFs of any of the calibration reference files used in the processing sequence. Histograms of the input data, the data following AtoD correction, and the calibrated output data are generated. Operation of this program is accomplished via keywords in the header of the input image. The output images of CALWFP are listed in Table 2.
This task is specific to WF/PC data and requires a large number of keywords obtained from the WF/PC Science Image Header. The Science Image File and its associated Data Quality File are always required, the Extracted Engineering Data File and its associated Data Quality File are required if the bias level subtraction option is selected.
