ResampleStep¶
- class jwst.resample.ResampleStep(name=None, parent=None, config_file=None, _validate_kwds=True, **kws)[source]¶
Bases:
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
- class_alias = 'resample'¶
- reference_file_types = ['drizpars']¶
- spec = "\n pixfrac = float(default=1.0) # change back to None when drizpar reference files are updated\n kernel = string(default='square') # change back to None when drizpar reference files are updated\n fillval = string(default='INDEF' ) # change back to None when drizpar reference files are updated\n weight_type = option('ivm', 'exptime', None, default='ivm') # change back to None when drizpar ref update\n output_shape = int_list(min=2, max=2, default=None) # [x, y] order\n crpix = float_list(min=2, max=2, default=None)\n crval = float_list(min=2, max=2, default=None)\n rotation = float(default=None)\n pixel_scale_ratio = float(default=1.0) # Ratio of input to output pixel scale\n pixel_scale = float(default=None) # Absolute pixel scale in arcsec\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 in_memory = boolean(default=True)\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) wht_type = option(‘ivm’, ‘exptime’, None, 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 overwrite the defaults pulled from the reference file.