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LSST Data Management Base Package
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Public Member Functions | Public Attributes | Static Public Attributes | Protected Member Functions | List of all members
lsst.pipe.tasks.functors.ComputePixelScale Class Reference
Inheritance diagram for lsst.pipe.tasks.functors.ComputePixelScale:
lsst.pipe.tasks.functors.LocalWcs lsst.pipe.tasks.functors.Functor lsst.pipe.tasks.functors.ConvertPixelSqToArcsecondsSq lsst.pipe.tasks.functors.ConvertPixelToArcseconds

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.

1329 def _func(self, df):
1330 return self.pixelScaleArcseconds(df[self.colCD_1_1],
1331 df[self.colCD_1_2],
1332 df[self.colCD_2_1],
1333 df[self.colCD_2_2])
1334
1335

◆ 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.

1300 def columns(self):
1301 return [self.colCD_1_1,
1302 self.colCD_1_2,
1303 self.colCD_2_1,
1304 self.colCD_2_2]
1305

◆ 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.

1306 def pixelScaleArcseconds(self, cd11, cd12, cd21, cd22):
1307 """Compute the local pixel to scale conversion in arcseconds.
1308
1309 Parameters
1310 ----------
1311 cd11 : `~pandas.Series`
1312 [1, 1] element of the local Wcs affine transform in radians.
1313 cd11 : `~pandas.Series`
1314 [1, 1] element of the local Wcs affine transform in radians.
1315 cd12 : `~pandas.Series`
1316 [1, 2] element of the local Wcs affine transform in radians.
1317 cd21 : `~pandas.Series`
1318 [2, 1] element of the local Wcs affine transform in radians.
1319 cd22 : `~pandas.Series`
1320 [2, 2] element of the local Wcs affine transform in radians.
1321
1322 Returns
1323 -------
1324 pixScale : `~pandas.Series`
1325 Arcseconds per pixel at the location of the local WC.
1326 """
1327 return 3600 * np.degrees(np.sqrt(np.fabs(cd11 * cd22 - cd12 * cd21)))
1328

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

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