JP-2682: Discontinue use of drizpars reference file (#8546)

CHANGES.rst

@@ -229,6 +229,8 @@ resample
 
 - Change `fillval` parameter default from INDEF to NaN [#8488]
 
+- Removed the use of the `drizpars` reference file [#8546]
+
 resample_spec
 -------------
 
@@ -240,6 +242,8 @@ resample_spec
   when the slit was closely aligned with the RA direction
   sky. [#8511]
 
+- Removed the use of the `drizpars` reference file [#8546]
+
 residual_fringe
 ---------------
 

docs/jwst/references_general/references_general.rst

@@ -150,8 +150,6 @@ documentation on each reference file.
 +-----------------------------------------------+--------------------------------------------------+
 | :ref:`refpix <refpix_step>`                   | :ref:`REFPIX <refpix_reffile>`                   |
 +-----------------------------------------------+--------------------------------------------------+
-| :ref:`resample <resample_step>`               | :ref:`DRIZPARS <drizpars_reffile>`               |
-+-----------------------------------------------+--------------------------------------------------+
 | :ref:`reset <reset_step>`                     | :ref:`RESET <reset_reffile>`                     |
 +-----------------------------------------------+--------------------------------------------------+
 | :ref:`residual_fringe <residual_fringe_step>` | :ref:`FRINGEFREQ <fringefreq_reffile>`           |
@@ -204,8 +202,6 @@ documentation on each reference file.
 +--------------------------------------------------+-----------------------------------------------+
 | :ref:`DISTORTION <distortion_reffile>`           | :ref:`assign_wcs <assign_wcs_step>`           |
 +--------------------------------------------------+-----------------------------------------------+
-| :ref:`DRIZPARS <drizpars_reffile>`               | :ref:`resample <resample_step>`               |
-+--------------------------------------------------+-----------------------------------------------+
 | :ref:`EMICORR <emicorr_reffile>`                 | :ref:`emicorr <emicorr_step>`                 |
 +--------------------------------------------------+-----------------------------------------------+
 | :ref:`EXTRACT1D <extract1d_reffile>`             | :ref:`extract_1d <extract_1d_step>`           |

docs/jwst/resample/main.rst

@@ -15,11 +15,9 @@ The ``resample`` step can take as input either:
 #. a single 2D input image
 #. an association table (in json format)
 
-The defined parameters for the drizzle operation itself get
-provided by the DRIZPARS reference file (from CRDS).  The exact values
-used depends on the number of input images being combined and the filter
-being used. Other information may be added as selection criteria later,
-but for now, only basic information is used.
+The parameters for the drizzle operation are provided via ``resample``
+step parameters, which can be overridden by a step parameter reference
+file from CRDS.
 
 The output product gets defined using the WCS information of all inputs,
 even if it is just a single input image. The output WCS defines a

docs/jwst/resample/reference_files.rst

@@ -1,5 +1,3 @@
 Reference File
 ==============
-The ``resample`` step uses the DRIZPARS reference file.
-
-.. include:: ../references_general/drizpars_reffile.inc
+The ``resample`` step does not use any reference files.

jwst/resample/resample_spec_step.py

@@ -62,35 +62,12 @@ def process(self, input):
             output = input_new.meta.filename
             self.blendheaders = False
 
-        # Get the drizpars reference file
-        for reftype in self.reference_file_types:
-            ref_filename = self.get_reference_file(input_models[0], reftype)
-
-        if ref_filename != 'N/A':
-            self.log.info('Drizpars reference file: {}'.format(ref_filename))
-            kwargs = self.get_drizpars(ref_filename, input_models)
-        else:
-            # Deal with NIRSpec, which currently has no default drizpars reffile
-            self.log.info("No DRIZPARS reffile")
-            kwargs = self._set_spec_defaults()
-            kwargs['blendheaders'] = self.blendheaders
-
-        kwargs['output_shape'] = self._check_list_pars(
-            self.output_shape,
-            'output_shape',
-            min_vals=[1, 1]
-        )
-        kwargs['output_wcs'] = self._load_custom_wcs(
-            self.output_wcs,
-            kwargs['output_shape']
-        )
-
-        kwargs['allowed_memory'] = self.allowed_memory
+        # Setup drizzle-related parameters
+        kwargs = self.get_drizpars()
         kwargs['output'] = output
-
-        # Call resampling
         self.drizpars = kwargs
 
+        # Call resampling
         if isinstance(input_models[0], MultiSlitModel):
             result = self._process_multislit(input_models)