lsst.pipe.tasks.functors.ComputePixelScale Class Reference

Inheritance diagram for lsst.pipe.tasks.functors.ComputePixelScale:

Public Member Functions
	columns (self)
	pixelScaleArcseconds (self, cd11, cd12, cd21, cd22)

Public Attributes
	colCD_1_1
	colCD_1_2
	colCD_2_1

Static Public Attributes
str	name = "PixelScale"

Protected Member Functions
	_func (self, df)

Detailed Description

Compute the local pixel scale from the stored CDMatrix.

Definition at line 1294 of file functors.py.

Member Function Documentation

_func()

lsst.pipe.tasks.functors.ComputePixelScale._func ( self, df )

protected

Reimplemented from lsst.pipe.tasks.functors.Functor.

Reimplemented in lsst.pipe.tasks.functors.ConvertPixelToArcseconds, and lsst.pipe.tasks.functors.ConvertPixelSqToArcsecondsSq.

Definition at line 1329 of file functors.py.

    def _func(self, df):
        return self.pixelScaleArcseconds(df[self.colCD_1_1],
                                         df[self.colCD_1_2],
                                         df[self.colCD_2_1],
                                         df[self.colCD_2_2])
 
 

columns()

lsst.pipe.tasks.functors.ComputePixelScale.columns

(

self

)

Columns required to perform calculation.

Reimplemented from lsst.pipe.tasks.functors.Functor.

Reimplemented in lsst.pipe.tasks.functors.ConvertPixelToArcseconds, and lsst.pipe.tasks.functors.ConvertPixelSqToArcsecondsSq.

Definition at line 1300 of file functors.py.

    def columns(self):
        return [self.colCD_1_1,
                self.colCD_1_2,
                self.colCD_2_1,
                self.colCD_2_2]
 

pixelScaleArcseconds()

lsst.pipe.tasks.functors.ComputePixelScale.pixelScaleArcseconds	(		self,
			cd11,
			cd12,
			cd21,
			cd22 )

Compute the local pixel to scale conversion in arcseconds.

Parameters
----------
cd11 : `~pandas.Series`
    [1, 1] element of the local Wcs affine transform in radians.
cd11 : `~pandas.Series`
    [1, 1] element of the local Wcs affine transform in radians.
cd12 : `~pandas.Series`
    [1, 2] element of the local Wcs affine transform in radians.
cd21 : `~pandas.Series`
    [2, 1] element of the local Wcs affine transform in radians.
cd22 : `~pandas.Series`
    [2, 2] element of the local Wcs affine transform in radians.

Returns
-------
pixScale : `~pandas.Series`
    Arcseconds per pixel at the location of the local WC.

Definition at line 1306 of file functors.py.

    def pixelScaleArcseconds(self, cd11, cd12, cd21, cd22):
        """Compute the local pixel to scale conversion in arcseconds.
 
        Parameters
        ----------
        cd11 : `~pandas.Series`
            [1, 1] element of the local Wcs affine transform in radians.
        cd11 : `~pandas.Series`
            [1, 1] element of the local Wcs affine transform in radians.
        cd12 : `~pandas.Series`
            [1, 2] element of the local Wcs affine transform in radians.
        cd21 : `~pandas.Series`
            [2, 1] element of the local Wcs affine transform in radians.
        cd22 : `~pandas.Series`
            [2, 2] element of the local Wcs affine transform in radians.
 
        Returns
        -------
        pixScale : `~pandas.Series`
            Arcseconds per pixel at the location of the local WC.
        """
        return 3600 * np.degrees(np.sqrt(np.fabs(cd11 * cd22 - cd12 * cd21)))
 

Member Data Documentation

colCD_1_1

lsst.pipe.tasks.functors.ComputePixelScale.colCD_1_1

Definition at line 1301 of file functors.py.

colCD_1_2

lsst.pipe.tasks.functors.ComputePixelScale.colCD_1_2

Definition at line 1302 of file functors.py.

colCD_2_1

lsst.pipe.tasks.functors.ComputePixelScale.colCD_2_1

Definition at line 1303 of file functors.py.

name

str lsst.pipe.tasks.functors.ComputePixelScale.name = "PixelScale"

static

Reimplemented in lsst.pipe.tasks.functors.ConvertPixelToArcseconds, and lsst.pipe.tasks.functors.ConvertPixelSqToArcsecondsSq.

Definition at line 1297 of file functors.py.

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The documentation for this class was generated from the following file:

• /j/snowflake/release/lsstsw/stack/lsst-scipipe-8.0.0/Linux64/pipe_tasks/gc07e1c2157+a98bf949bb/python/lsst/pipe/tasks/functors.py