NIRISSGrismModel
- class jwst.datamodels.NIRISSGrismModel(init=None, displ=None, dispx=None, dispy=None, invdispl=None, orders=None, fwcpos_ref=None, **kwargs)
Bases:
ReferenceFileModel
A model for a reference file of type “specwcs” for NIRISS grisms.
- Parameters:
- displ: `~astropy.modeling.Model`
NIRISS Grism wavelength dispersion model
- dispx~astropy.modeling.Model
NIRISS Grism row dispersion model
- dispy~astropy.modeling.Model
NIRISS Grism column dispersion model
- invdispl~astropy.modeling.Model
NIRISS Grism inverse wavelength dispersion model
- invdispx~astropy.modeling.Model
NIRISS Grism inverse row dispersion model
- invdispy~astropy.modeling.Model
NIRISS Grism inverse column dispersion model
- orders~astropy.modeling.Model
NIRISS Grism orders, matched to the array locations of the dispersion models
- fwcpos_reffloat
The reference value for the filter wheel position
- Parameters:
- initstr, tuple, ~astropy.io.fits.HDUList, ndarray, dict, None
None : Create a default data model with no shape.
tuple : Shape of the data array. Initialize with empty data array with shape specified by the.
file path: Initialize from the given file (FITS or ASDF)
readable file object: Initialize from the given file object
~astropy.io.fits.HDUList : Initialize from the given ~astropy.io.fits.HDUList.
A numpy array: Used to initialize the data array
dict: The object model tree for the data model
- schemadict, str (optional)
Tree of objects representing a JSON schema, or string naming a schema. The schema to use to understand the elements on the model. If not provided, the schema associated with this class will be used.
- memmapbool
Turn memmap of FITS/ASDF file on or off. (default: False).
- pass_invalid_valuesbool or None
If True, values that do not validate the schema will be added to the metadata. If False, they will be set to None. If None, value will be taken from the environmental PASS_INVALID_VALUES. Otherwise the default value is False.
- strict_validationbool or None
If True, schema validation errors will generate an exception. If False, they will generate a warning. If None, value will be taken from the environmental STRICT_VALIDATION. Otherwise, the default value is False.
- validate_on_assignmentbool or None
Defaults to ‘None’. If None, value will be taken from the environmental VALIDATE_ON_ASSIGNMENT, defaulting to ‘True’ if no environment variable is set. If ‘True’, attribute assignments are validated at the time of assignment. Validation errors generate warnings and values will be set to None. If ‘False’, schema validation occurs only once at the time of write. Validation errors generate warnings.
- validate_arraysbool
If True, arrays will be validated against ndim, max_ndim, and datatype validators in the schemas.
- ignore_missing_extensionsbool
When False, raise warnings when a file is read that contains metadata about extensions that are not available. Defaults to True.
- kwargsdict
Additional keyword arguments passed to lower level functions. These arguments are generally file format-specific. Arguments of note are:
FITS
- skip_fits_update - bool or None
DEPRECATED True to skip updating the ASDF tree from the FITS headers, if possible. If None, value will be taken from the environmental SKIP_FITS_UPDATE. Otherwise, the default value is True.
Attributes Summary
The schema URI to validate the model against.
Methods Summary
to_fits
()Write a data model to a FITS file.
validate
()Convenience function to be run when files are created.
Attributes Documentation
- reftype = 'specwcs'
- schema_url = 'http://stsci.edu/schemas/jwst_datamodel/specwcs_niriss_grism.schema'
The schema URI to validate the model against. If None, only basic validation of required metadata properties (filename, model_type) will occur.
Methods Documentation
- populate_meta()
- to_fits()
Write a data model to a FITS file.
- Parameters:
- initfile path or file object
- args, kwargs
Any additional arguments are passed along to astropy.io.fits.writeto.
- validate()
Convenience function to be run when files are created. Checks that required reference file keywords are set.