lsst.pipe.tasks.functors.HsmFwhm Class Reference

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

Static Public Attributes
str	name = 'HSM Psf FWHM'
float	pixelScale = 0.168
int	SIGMA2FWHM = 2*np.sqrt(2*np.log(2))

Protected Member Functions
	_func (self, df)

Static Protected Attributes
tuple	_columns = ('ext_shapeHSM_HsmPsfMoments_xx', 'ext_shapeHSM_HsmPsfMoments_yy')

Detailed Description

Functor to calculate the PSF FWHM with second moments measured from the
HsmShapeAlgorithm plugin.

This is in units of arcseconds, and assumes the hsc_rings_v1 skymap pixel
scale of 0.168 arcseconds/pixel.

Notes
-----
This conversion assumes the PSF is Gaussian, which is not always the case.

Definition at line 1086 of file functors.py.

Member Function Documentation

_func()

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

protected

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

Definition at line 1103 of file functors.py.

    def _func(self, df):
        return self.pixelScale*self.SIGMA2FWHM*np.sqrt(
            0.5*(df['ext_shapeHSM_HsmPsfMoments_xx'] + df['ext_shapeHSM_HsmPsfMoments_yy']))
 
 

Member Data Documentation

_columns

tuple lsst.pipe.tasks.functors.HsmFwhm._columns = ('ext_shapeHSM_HsmPsfMoments_xx', 'ext_shapeHSM_HsmPsfMoments_yy')

staticprotected

Definition at line 1098 of file functors.py.

name

str lsst.pipe.tasks.functors.HsmFwhm.name = 'HSM Psf FWHM'

static

Definition at line 1097 of file functors.py.

pixelScale

float lsst.pipe.tasks.functors.HsmFwhm.pixelScale = 0.168

static

Definition at line 1100 of file functors.py.

SIGMA2FWHM

int lsst.pipe.tasks.functors.HsmFwhm.SIGMA2FWHM = 2*np.sqrt(2*np.log(2))

static

Definition at line 1101 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