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11.2 Initial Data Processing

When all of the files pertaining to a given astrometry visit are present in a single directory, pipeline processing can begin. The initial round of data processing accomplishes several general tasks, regardless of whether the observations were gathered in POSITION mode or TRANSFER mode. The pipeline:

Reads the seven GEIS files belonging to each individual observation.
Identifies the FGS being used for astrometry and its observing mode.
Identifies potentially missing files.
Determines the status of the guiding FGSs, checking whether zero, one, or two guiding FGSs were actively maintaining the pointing of the telescope and whether they were guiding in CoarseTrack or FineLock.
Inspects the flags/status bits to determine whether the astrometry observation succeeded or failed, and in the case of a failure, to identify the reason for the failure.
Prepares output files with keywords whose values are either extracted from the input header files or computed from contents of the data files.
Assesses the data quality of successful observations, masking outliers, -garbled telemetry, and telemetry dropouts. (Outliers are data that do not appear to be garbled but make no sense when viewed in the context of neighboring data points.)

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