Flatfielded data are passed to the iterative map maker to produce a Frame image, which is then calibrated and displayed. A new Group image is created and displayed. The noise properties of the new Group image are calculated and written to a log file, log.noise.
Control in this recipe is handled by a series of Frame and Group uhdr flags. These are NOCALIB, OBSEND, PERCENT_CMP and TCS_INDEX (Frame) and LAST_INDEX and MAPMADE (Group). The TCS_INDEX and LAST_INDEX values are used to determine if the scan pattern has been completed since the last map was made. OBSEND is used to decide whether or not to create a new Group coadd. The NOCALIB flag is used to bypass the calibration step as raw timeseries data should not be calibrated.
The PERCENT_CMP entry is specified in this recipe as an argument to _PROCESS_SCAN_DATA_. However, it is only used for observations which consist of a single pass of the scan pattern.
The noise level estimated from the current Group file is stored in log.noise.