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

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.

1103 def _func(self, df):
1104 return self.pixelScale*self.SIGMA2FWHM*np.sqrt(
1105 0.5*(df['ext_shapeHSM_HsmPsfMoments_xx'] + df['ext_shapeHSM_HsmPsfMoments_yy']))
1106
1107

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.


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