calwebb_image3: Stage 3 Imaging Processing¶
- Class:
- Alias:
calwebb_image3
Stage 3 processing for direct-imaging observations is intended for combining the
calibrated data from multiple exposures (e.g. a dither or mosaic pattern) into a
single rectified (distortion corrected) product.
Before being combined, the exposures receive additional corrections for the
purpose of astrometric alignment, background matching, and outlier rejection.
The steps applied by the calwebb_image3
pipeline are shown below.
This pipeline is intended for non-TSO imaging only. TSO imaging data should be
processed using the calwebb_tso3 pipeline.
calwebb_image3 |
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Arguments¶
The calwebb_image3
pipeline does not have any optional arguments.
Inputs¶
2D calibrated images¶
- Data model:
- File suffix:
_cal
The inputs to the calwebb_image3
pipeline are one or more
calwebb_image2
calibrated (“_cal”) image products. In order to process and combine multiple
images, an ASN file must be used as input, listing the exposures to be
processed. It is also possible use a single “_cal” file as input to
calwebb_image3
, in which case only the resample and
source_catalog steps will be applied.
Outputs¶
CR-flagged exposures¶
- Data model:
- File suffix:
_crf
If the outlier_detection step is applied, a new version of each input calibrated exposure is created, in which the DQ array has been updated to flag pixels detected as outliers. These files use the “_crf” (CR-Flagged) product type suffix and also includes the association candidate ID as a new field in the original product root name, e.g. “jw96090001001_03101_00001_nrca2_o001_crf.fits.”
Resampled and combined 2D image¶
- Data model:
- File suffix:
_i2d
A resampled 2D image product of type “_i2d” is created containing the combined, rectified association of exposures, which is the direct output of the resample step.
Source catalog¶
- Data model:
N/A
- File suffix:
_cat
The source catalog produced by the source_catalog step
from the “_i2d” product is saved as an ASCII file in ecsv
format, with a product type
of “_cat.”
Segmentation map¶
- Data model:
- File suffix:
_segm
A 2D image segmentation map produced by the source_catalog step from the “_i2d” product, saved as a FITS file with a single image extension and a product type suffix of “_segm.”