mask_snowballs¶
- grizli.prep.mask_snowballs(visit, snowball_erode=3, snowball_dilate=18, mask_bit=1024, instruments=['NIRCAM', 'NIRISS'], max_fraction=0.3, unset4=False, **kwargs)[source]¶
Mask JWST IR snowballs
- Parameters
- visitdict
Visit definition dictionary (keys
product,filesat at minimum)- snowball_erodeint
First pass binary erosion on DQ=4 mask
- snowball_dilateint
Subsequent binary dilation on the eroded DQ=4 mask
- mask_bitint
Bit to set for identified snowballs
- instrumentslist
Instruments where mask is calculated
- max_fractionfloat
Maximum allowed fraction of pixels in identified snowballs. If exceeded, then turn off the mask.
- unset4bool
Unset DQ=4 bit for flagged CRs
- Returns
- Updates
DQextension of files invisit['files']and sets some - status keywords
- Updates