What are the exact steps in the pipeline processing of data?
The GALEX data pipeline converts GALEX satellite telemetry data and any necessary corollary data into calibrated images and catalogs. The GALEX Science Operations Center (SOC) receives data from the satellite and ingestpipe unpacks it into time tagged photon lists, instrument/SC housekeeping and satellite aspect information. From these data sets, orbpipe generates images, spectra and source catalogs. An astrometric module corrects the photon positions for detector and optical distortions and determines an aspect solution using star positions from the time tagged photon data. A photometric module accumulates the photons into count and intensity maps and extracts sources from images. A spectroscopic module uses image source catalog inputs to extract spectra of these sources from the multiple slitless grism observations.
