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statregions stsdas.hst_calib.nicmos


NAME · USAGE · DESCRIPTION · PARAMETERS · BUGS · SEE_ALSO

NAME

statregions -- Edit the parameter set to select image statistics regions.

USAGE

statregions

DESCRIPTION

The `statregions' parameters specify various image sections to be used when computing statistics in the `pedsky' task. The `quad1', `quad2', `quad3', and `quad4' parameters specify the image section to use when computing the clipped median (pedestal estimate) of each image quadrant. The `statsec' parameter specifies the image section to use when computing the rms of the pedestal and sky-subtracted image.

These image section specifications can be used to avoid some portion of an image when measuring either the pedestal estimate or the resulting residuals. Examples might include the avoidance of a bright star near the edge of a quadrant, or if one wished to avoid measurement in the vignetted region of an image (especially for NICMOS camera 3). Note that the default quadrant specifications avoid column and row 128, which are often rather flaky.

Note that this is a pset, not an executable task; it defines a set of parameters used by other tasks. Invoking the pset by name runs `eparam' on the parameter set, allowing the user to modify the parameters. Alternatively, the parameters may be modified on the command line by specifying the pset name and parameter name. For example, the user can type `statregions.quad1="[1:127,1:127]"' to set the image section to be used when computing statistics for quadrant 1. Parameters can also be edited by using `eparam' on the calling task (e.g., by typing "eparam pedsky"), in which case `statregions' will appear as one of the task parameters; the `statregions' parameters may then be edited by positioning the cursor on the line containing the pset name and typing ":e". After editing the pset parameters, type <Cntrl>-Z to return to the main task parameter menu.

PARAMETERS

(quad= "[1:127,1:127]") [string]
Image section for measuring pedestal level in quadrant 1.
(quad= "[129:256,1:127]") [string]
Image section for measuring pedestal level in quadrant 2.
(quad= "[1:127,129:256]") [string]
Image section for measuring pedestal level in quadrant 3.
(quad= "[129:256,129:256]") [string]
Image section for measuring pedestal level in quadrant 4.
(statsec = "[1:256,1:256]") [string]
Image section for measuring rms residuals in pedestal subtracted image.

BUGS

SEE ALSO

pedsky


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