Package pydrizzle :: Module pattern :: Class Pattern

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Class Pattern

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Set default values for these to be overridden by instrument specific class variables as necessary.

Instance Methods

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DeltaXYtoOffset(self, delta)
Converts provided delta(x,y) pixel offset into a delta(RA,Dec) offset in arcseconds.

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__init__(self, filename, output=None, pars=None)
x.__init__(...) initializes x; see help(type(x)) for signature

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addMembers(self, filename)
Build rootname for each SCI extension, and create the mask image from the DQ extension.

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buildMetachip(self, update=True)
Build up the new metashape based on the corrected size and position for each Exposure.

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buildPars(self, ref=None)
This method would build a list of parameters to run 'drizzle' one a single input image.

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buildProduct(self, filename, output)
Create Exposure object for meta-chip product after applying distortion model to input members.

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closeHandle(self)
Closes image_handle.

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computeCubicCoeffs(self)
Method for converting cubic and Trauger coefficients tables into a usable form.

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computeOffsets(self, parity=None, refchip=None)
This version of 'computeOffsets' calculates the zero-point shifts to be included in the distortion coefficients table used by 'drizzle'.

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getExptime(self)

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getHeaderHandle(self)
Sets up the PyFITS image handle and Primary header as self.image_handle and self.header.

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getMember(self, memname)
Return the class instance for the member with name memname.

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getMemberNames(self)
Return the names of all members for this Class.

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getProductCorners(self)
Compute the product's corner positions based on input exposure's corner positions.

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getShifts(self, member, wcs)
Translate the delta's in RA/Dec for each image's shift into a shift of the undistorted image.

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getWCS(self)

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setBunit(self, value=None)
Set the bunit attribute for each member.

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setNames(self, filename, output)
Define standard name attibutes:...

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transformMetachip(self, ref)
This method transforms this Exposure's WCS to be consistent with the provided reference WCS 'ref'.

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Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Class Variables

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COPY_SUFFIX = '.orig'

DETECTOR_NAME = 'detector'

IDCKEY = 'IDCTAB'

NUM_IMSET = 3

PARITY = {'detector': [[1.0, 0.0], [0.0, 1.0]]}

PA_KEY = 'PA_V3'

REFDATA = {'detector': [[1.0, 1.0], [1.0, 1.0]]}

Properties

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Inherited from object: __class__

Method Details

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init(self, filename, output=None, pars=None)
(Constructor)

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x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__: (inherited documentation)

addMembers(self, filename)

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Build rootname for each SCI extension, and create the mask image from the DQ extension. It would then append a new Exposure object to 'members' list for each extension.

buildMetachip(self, update=True)

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Build up the new metashape based on the corrected size and position for each Exposure. (Pattern method)

buildPars(self, ref=None)

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This method would build a list of parameters to run 'drizzle'
one a single input image.
   The reference image info 'ref' will be passed as a SkyField object.
   The default output reference frame will be passed as 'def_wcs'
   for comparison to the user's selected object 'ref'.

computeCubicCoeffs(self)

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Method for converting cubic and Trauger coefficients tables into a usable form. It also replaces 'computeOffsets' for those tables as well.

computeOffsets(self, parity=None, refchip=None)

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This version of 'computeOffsets' calculates the zero-point shifts to be included in the distortion coefficients table used by 'drizzle'. It REQUIRES a parity matrix to convert from V2/V3 coordinates into detector image X/Y coordinates. This matrix will be specific to each detector.

getHeaderHandle(self)

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Sets up the PyFITS image handle and Primary header as self.image_handle and self.header.

When Pattern being used for output product, filename will be set to None and this returns None for header and image_handle.

getMemberNames(self)

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Return the names of all members for this Class. Output: [{self.name:[list of member names]}]

getShifts(self, member, wcs)

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Translate the delta's in RA/Dec for each image's shift into a
shift of the undistorted image.

Input:
    member - Exposure class for chip
    wcs    - PyDrizzle product WCS object

Output:
    [xsh, ysh, rot, scale] -
          Returns the full set of shift information as a list

setBunit(self, value=None)

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Set the bunit attribute for each member. Default value defined in Exposure class is 'ELECTRONS' If a new value is given as input, it will override the default.

setNames(self, filename, output)

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Define standard name attibutes:
        outname     - Default final output name
        outdata     - Name for drizzle science output
        outsingle   - Name for output for single image

transformMetachip(self, ref)

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This method transforms this Exposure's WCS to be consistent with the provided reference WCS 'ref'. This method only operates on the product MetaChip, with the original WCS being preserved as 'wcslin'.

Primarily, this transformation involves scaling and rotating the chip to match the reference frame values. Also, any specified size for the output frame would replace the default rotated/scaled size. All rotations would be about the center, and the reference pixel position gets shifted to accomodate this rotation.

Class Pattern

__init__(self, filename, output=None, pars=None) (Constructor)

addMembers(self, filename)

buildMetachip(self, update=True)

buildPars(self, ref=None)

computeCubicCoeffs(self)

computeOffsets(self, parity=None, refchip=None)

getHeaderHandle(self)

getMemberNames(self)

getShifts(self, member, wcs)

setBunit(self, value=None)

setNames(self, filename, output)

transformMetachip(self, ref)

init(self, filename, output=None, pars=None)
(Constructor)