Image Class

Classes to keep track of all WCS and catalog information. Used by TweakReg.

Authors:Warren Hack, Mihai Cara License:LICENSE

class drizzlepac.imgclasses.Image(filename, input_catalogs=None, exclusions=None, **kwargs)

Bases: object

Primary class to keep track of all WCS and catalog information for a single input image. This class also performs all matching and fitting.

Parameters:

filename : str

Filename for image.

input_catalogs : list of str or None

Filename of catalog files for each chip, if specified by user.

kwargs : dict

Parameters necessary for processing derived from input configObj object.

buildDefaultRefWCS()

Generate a default reference WCS for this image.

buildSkyCatalog()

Convert sky catalog for all chips into a single catalog for the entire field-of-view of this image.

clean()

Remove intermediate files created.

close()

Close any open file handles and flush updates to disk

compute_fit_rms()

get_shiftfile_row()

Return the information for a shiftfile for this image to provide compatability with the IRAF-based MultiDrizzle.

get_wcs()

Helper method to return a list of all the input WCS objects associated with this image.

get_xy_catnames()

Return a string with the names of input_xy catalog names

match(refimage, quiet_identity, **kwargs)

Uses xyxymatch to cross-match sources between this catalog and a reference catalog (refCatalog).

openFile(openDQ=False)

Open file and set up filehandle for image file

performFit(**kwargs)

Perform a fit between the matched sources.

Parameters:

kwargs : dict

Parameter necessary to perform the fit; namely, fitgeometry.

Notes

This task still needs to implement (eventually) interactive iteration of

the fit to remove outliers.

sortSkyCatalog()

Sort and clip the source catalog based on the flux range specified by the user. It keeps a copy of the original full list in order to support iteration.

transformToRef(ref_wcs, force=False)

Transform sky coords from ALL chips into X,Y coords in reference WCS.

updateHeader(wcsname=None, reusename=False)

Update header of image with shifts computed by perform_fit().

writeHeaderlet(**kwargs)

Write and/or attach a headerlet based on update to PRIMARY WCS

write_fit_catalog()

Write out the catalog of all sources and resids used in the final fit.

write_outxy(filename)

Write out the output(transformed) XY catalog for this image to a file.

write_skycatalog(filename)

Write out the all_radec catalog for this image to a file.

class drizzlepac.imgclasses.RefImage(wcs_list, catalog, xycatalog=None, cat_origin=None, **kwargs)

Bases: object

This class provides all the information needed by to define a reference tangent plane and list of source positions on the sky.

Warning

When wcs_list is a Python list of WCS objects, each element must be an instance of stwcs.wcsutil.HSTWCS.

append_not_matched_sources(image)

clean()

Remove intermediate files created

clear_dirty_flag()

close()

get_shiftfile_row()

Return the information for a shiftfile for this image to provide compatability with the IRAF-based MultiDrizzle.

set_dirty()

transformToRef()

Transform reference catalog sky positions (self.all_radec) to reference tangent plane (self.wcs) to create output X,Y positions.

write_skycatalog(filename, show_flux=False, show_id=False)

Write out the all_radec catalog for this image to a file.