LocalWcs¶

class lsst.pipe.tasks.functors.LocalWcs(colCD_1_1, colCD_1_2, colCD_2_1, colCD_2_2, **kwargs)¶

Bases: Functor

Computations using the stored localWcs.

Attributes Summary

`columns`	Columns required to perform calculation
`name`
`noDup`
`shortname`	Short name of functor (suitable for column name/dict key)

Methods Summary

`__call__`(data[, dropna])	Call self as a function.
`computeDeltaRaDec`(x, y, cd11, cd12, cd21, cd22)	Compute the distance on the sphere from x2, y1 to x1, y1.
`computeSkySeperation`(ra1, dec1, ra2, dec2)	Compute the local pixel scale conversion.
`difference`(data1, data2, **kwargs)	Computes difference between functor called on two different DataFrame/Handle objects
`fail`(df)
`getSkySeperationFromPixel`(x1, y1, x2, y2, ...)	Compute the distance on the sphere from x2, y1 to x1, y1.
`multilevelColumns`(data[, columnIndex, ...])	Returns columns needed by functor from multilevel dataset

Attributes Documentation

columns¶: Columns required to perform calculation

name = 'LocalWcsOperations'¶

noDup¶

shortname¶: Short name of functor (suitable for column name/dict key)

Methods Documentation

__call__(data, dropna=False)¶: Call self as a function.

computeDeltaRaDec(x, y, cd11, cd12, cd21, cd22)¶

Compute the distance on the sphere from x2, y1 to x1, y1.

Parameters:

xpandas.Series: X pixel coordinate.
ypandas.Series: Y pixel coordinate.
cd11pandas.Series: [1, 1] element of the local Wcs affine transform.
cd11pandas.Series: [1, 1] element of the local Wcs affine transform.
cd12pandas.Series: [1, 2] element of the local Wcs affine transform.
cd21pandas.Series: [2, 1] element of the local Wcs affine transform.
cd22pandas.Series: [2, 2] element of the local Wcs affine transform.

Returns:

raDecTupletuple: RA and dec conversion of x and y given the local Wcs. Returned units are in radians.

computeSkySeperation(ra1, dec1, ra2, dec2)¶

Compute the local pixel scale conversion.

Parameters:

ra1pandas.Series: Ra of the first coordinate in radians.
dec1pandas.Series: Dec of the first coordinate in radians.
ra2pandas.Series: Ra of the second coordinate in radians.
dec2pandas.Series: Dec of the second coordinate in radians.

Returns:

distpandas.Series: Distance on the sphere in radians.

difference(data1, data2, **kwargs)¶: Computes difference between functor called on two different DataFrame/Handle objects

fail(df)¶

getSkySeperationFromPixel(x1, y1, x2, y2, cd11, cd12, cd21, cd22)¶

Compute the distance on the sphere from x2, y1 to x1, y1.

Parameters:

x1pandas.Series: X pixel coordinate.
y1pandas.Series: Y pixel coordinate.
x2pandas.Series: X pixel coordinate.
y2pandas.Series: Y pixel coordinate.
cd11pandas.Series: [1, 1] element of the local Wcs affine transform.
cd11pandas.Series: [1, 1] element of the local Wcs affine transform.
cd12pandas.Series: [1, 2] element of the local Wcs affine transform.
cd21pandas.Series: [2, 1] element of the local Wcs affine transform.
cd22pandas.Series: [2, 2] element of the local Wcs affine transform.

Returns:

Distancepandas.Series: Arcseconds per pixel at the location of the local WC

multilevelColumns(data, columnIndex=None, returnTuple=False)¶

Returns columns needed by functor from multilevel dataset

To access tables with multilevel column structure, the DeferredDatasetHandle or InMemoryDatasetHandle need to be passed either a list of tuples or a dictionary.

Parameters:

datavarious: The data as either DeferredDatasetHandle, or InMemoryDatasetHandle.
columnIndex (optional): pandas `Index` object: either passed or read in from DeferredDatasetHandle.
`returnTuple`bool: If true, then return a list of tuples rather than the column dictionary specification. This is set to True by CompositeFunctor in order to be able to combine columns from the various component functors.

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LocalWcs¶