Step Arguments

The outlier_detection step has the following optional arguments that control the behavior of the processing:

--weight_type (string, default=’exptime’)

The type of data weighting to use during resampling; options are ‘exptime’, ‘error’, and ‘None’.

--pixfrac (float, default=1.0)

The pixel fraction used during resampling; valid values go from 0.0 to 1.0.

--kernel (string, default=’square’)

The form of the kernel function used to distribute flux onto a resampled image. Options are ‘square’, ‘turbo’, ‘point’, ‘lanczos’, and ‘tophat’.

--fillval (string, default=’INDEF’)

The value to assign to resampled image pixels that have zero weight or do not receive any flux from any input pixels during drizzling. Any floating-point value, given as a string, is valid. A value of ‘INDEF’ will use the last zero weight flux.

--nlow (integer, default=0)

The number of low values in each pixel stack to ignore when computing the median value.

--nhigh (integer, default=0)

The number of high values in each pixel stack to ignore when computing the median value.

--maskpt (float, default=0.7)

The percent of maximum weight to use as lower-limit for valid data; valid values go from 0.0 to 1.0.

--grow (integer, default=1)

The radius, in pixels, from a bad pixel for neighbor rejection.

--snr (string, default=’4.0 3.0’)

The signal-to-noise values to use for bad pixel identification. Valid values are a pair of floating-point values in a single string.

--scale (string, default=’0.5 0.4’)

The scaling factor applied to derivative used to identify bad pixels. Valid values are a pair of floating-point values in a single string.

--backg (float, default=0.0)

User-specified background value to apply to the median image.

--save_intermediate_results (boolean, default=False)

Specifies whether or not to save any intermediate products created during step processing.

--resample_data (boolean, default=True)

Specifies whether or not to resample the input images when performing outlier detection.

--good_bits (string, default=”~DO_NOT_USE”)

The DQ bit values from the input image DQ arrays that should be considered ‘good’ when building the weight mask. See DQ flag Parameter Specification for details.

--scale_detection (bool, default=False)

Specifies whether or not to rescale the individual input images to match total signal when doing comparisons.