Atmospheric Model, Path skip defringing step:8 Assemble CCD WBS: 02C.03.01 Assemble per-amplifier Trimmed Exposures into a per-CCD Trimmed Exposure. Scenario Steps Summary Rejoins at Load all per-amplifier Trimmed Exposure(s) Basic Path Write them into a single per-CCD Trimmed Exposure Detect Sources WBS: 02C.03.01 This process identifies the Sources that are present in the Raw. The process outputs a list of Sources and the Pixels occupied by those Sources (i.e., a detection Mask). The detected and measured Sources need not necessarily be persisted. Rejoins Scenario Steps Summary at Subtract Sky Background Model Correlate the Raw Exposure with its PSF, producing a detection likelihood Mask Plane. Find all Pixels above the specified S/N threshold in the detection likelihood Mask Plane. Basic Path Decompose those Pixel(s) into spatially isolated groups and find peaks within the Footprint(s). The positions of the peaks will represent the nominal locations of detected Source(s), until a better Centroid is determined by later measurement. Determine Aperture Correction WBS: 02C.03.01 Determine Aperture Correction factors for the Raw Scenario Steps Summary Rejoins at Select bright, isolated, point Source(s) Basic Path Estimate Aperture Correction
Atmospheric Model, skip defringing Path step:8 Assemble CCD WBS: 02C.03.01 Assemble per-amplifier Trimmed Exposures into a per-CCD Trimmed Exposure. Scenario Steps Summary Rejoins at Basic Path Load all per-amplifier Trimmed Exposure(s) Write them into a single per-CCD Trimmed Exposure Detect Sources WBS: 02C.03.01 This process identifies the Sources that are present in the Raw. The process outputs a list of Sources and the Pixels occupied by those Sources (i.e., a detection Mask). The detected and measured Sources need not necessarily be persisted. Scenario Steps Summary Rejoins at Basic Path Subtract Sky Background Model Correlate the Raw Exposure with its PSF, producing a detection likelihood Mask Plane. Find all Pixels above the specified S/N threshold in the detection likelihood Mask Plane. Decompose those Pixel(s) into spatially isolated groups and find peaks within the Footprint(s). The positions of the peaks will represent the nominal locations of detected Source(s), until a better Centroid is determined by later measurement. Determine Aperture Correction WBS: 02C.03.01 Determine Aperture Correction factors for the Raw Scenario Steps Summary Rejoins at Basic Path Select bright, isolated, point Source(s) Estimate Aperture Correction