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 |
|---|
Arguments
--in_memoryBoolean governing whether to load all models in the input association to memory at once (faster) or to save to temporary files when not in use (slower, less memory usage). Default is True.
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.”