ResampleStep¶
-
class
jwst.resample.
ResampleStep
(name=None, parent=None, config_file=None, _validate_kwds=True, **kws)[source]¶ Bases:
jwst.stpipe.core.JwstStep
Resample input data onto a regular grid using the drizzle algorithm.
- Parameters
input (DataModel or Association) – Single filename for either a single image or an association table.
Create a
Step
instance.- Parameters
name (str, optional) – The name of the Step instance. Used in logging messages and in cache filenames. If not provided, one will be generated based on the class name.
parent (Step instance, optional) – The parent step of this step. Used to determine a fully-qualified name for this step, and to determine the mode in which to run this step.
config_file (str path, optional) – The path to the config file that this step was initialized with. Use to determine relative path names of other config files.
**kws (dict) – Additional parameters to set. These will be set as member variables on the new Step instance.
Attributes Summary
Methods Summary
get_drizpars
(ref_filename, input_models)Extract drizzle parameters from reference file.
process
(input)This is where real work happens.
update_phot_keywords
(model)Update pixel scale keywords
Attributes Documentation
-
reference_file_types
= ['drizpars']¶
-
spec
= "\n pixfrac = float(default=1.0)\n kernel = string(default='square')\n fillval = string(default='INDEF')\n weight_type = option('ivm', 'exptime', default='ivm')\n pixel_scale_ratio = float(default=1.0) # Ratio of input to output pixel scale\n single = boolean(default=False)\n blendheaders = boolean(default=True)\n allowed_memory = float(default=None) # Fraction of memory to use for the combined image.\n "¶
Methods Documentation
-
get_drizpars
(ref_filename, input_models)[source]¶ Extract drizzle parameters from reference file.
This method extracts parameters from the drizpars reference file and uses those to set defaults on the following ResampleStep configuration parameters:
pixfrac = float(default=None) kernel = string(default=None) fillval = string(default=None)
Once the defaults are set from the reference file, if the user has used a resample.cfg file or run ResampleStep using command line args, then these will overwerite the defaults pulled from the reference file.