Calibration Access and Data Handbook


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Description

This CCF component is used by the SAS. The LargeScaleSens file describes the large scale response uniformity of the combination filter and detector. The large scale flat field correction is applied to an image by multiplication, thus the inverse normalized sensitivity is stored in the CCF component.

The LargeScaleSens file maps the relative sensitivity variations over longer spatial scale for the combination of a filter element and the detector. The FOV is mapped at a coarser grid. An interpolation of the large-scale map is required in order to obtain a map at a finer grid.

The LargeScaleSens file consists of 12 image extensions. Generally there is one extension associated with each filter element, except for the grism where there is one extension for the zero and first order respectively. In total there are 12 image extension contained in the LargeScaleSens file.

FILTER-U large scale response of U-filter
FILTER-B large scale response of B-filter
FILTER-V large scale response of B-filter
FILTER-UVW1 large scale response of UVW1-filter
FILTER-UVM2 large scale response of UVM2-filter
FILTER-UVW2 large scale response of UVW2-filter
FILTER-WHITE large scale response of WHITE-filter
FILTER-MAGNI large scale response of MAGNI-filter
FILTER-GRISM1 large scale response of GRISM1 1st order
FILTER-GRISM2 large scale response of GRISM2 1st order
FILTER-GRISM10 large scale response of GRISM1 0th order
FILTER-GRISM20 large scale response of GRISM2 0th order

The format of each extensions is as listed below:

Image: FILTER-FilterId

keyword keyword type keyword unit keyword value comment
BITPIX   not applicable -32  
NAXIS I not applicable 2  
NAXIS1 I not applicable may vary  
NAXIS2 I not applicable may vary  
CTYPE1 S not applicable rawx  
CRVAL1 E pixel may vary  
CDELT1 E pixel may vary  
CTYPE2 S not applicable rawy  
CRVAL2 E pixel may vary  
CDELT2 E pixel may vary  
AVGERAGE E not applicable may vary avg. flatfield value of good pixel
DAVGERAGE E not applicable may vary 1$\sigma$ uncertainty of AVERAGE
PIXERR E % may vary avg. % of 1$\sigma$ uncerainty of
        a single pixel value


next up previous contents
Next: Generation from Ground Calibration Up: LARGESCALESENS Previous: LARGESCALESENS   Contents
Michael Smith 2011-09-20