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# 

# LSST Data Management System 

# Copyright 2008, 2009, 2010 LSST Corporation. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

 

__all__ = ["CatalogStarSelectorConfig", "CatalogStarSelectorTask"] 

 

import numpy as np 

 

from lsst.meas.algorithms import BaseSourceSelectorTask, sourceSelectorRegistry 

from lsst.pipe.base import Struct 

import lsst.pex.config as pexConfig 

import lsst.afw.display.ds9 as ds9 

 

 

class CatalogStarSelectorConfig(BaseSourceSelectorTask.ConfigClass): 

fluxLim = pexConfig.RangeField( 

doc="specify the minimum psfFlux for good Psf Candidates", 

dtype=float, 

default=0.0, 

min=0.0, 

) 

fluxMax = pexConfig.RangeField( 

doc="specify the maximum psfFlux for good Psf Candidates (ignored if == 0)", 

dtype=float, 

default=0.0, 

min=0.0, 

) 

badFlags = pexConfig.ListField( 

doc="List of flags which cause a source to be rejected as bad", 

dtype=str, 

default=[ 

"base_PixelFlags_flag_edge", 

"base_PixelFlags_flag_interpolatedCenter", 

"base_PixelFlags_flag_saturatedCenter", 

], 

) 

 

 

class CheckSource: 

"""A functor to check whether a source has any flags set that should cause it to be labeled bad.""" 

 

def __init__(self, table, fluxLim, fluxMax, badFlags): 

self.keys = [table.getSchema().find(name).key for name in badFlags] 

self.keys.append(table.getCentroidFlagKey()) 

self.fluxLim = fluxLim 

self.fluxMax = fluxMax 

 

def __call__(self, source): 

for k in self.keys: 

if source.get(k): 

return False 

if self.fluxLim is not None and source.getPsfInstFlux() < self.fluxLim: # ignore faint objects 

return False 

if self.fluxMax != 0.0 and source.getPsfInstFlux() > self.fluxMax: # ignore bright objects 

return False 

return True 

 

# \addtogroup LSST_task_documentation 

# \{ 

# \page CatalogStarSelectorTask 

# \ref CatalogStarSelectorTask_ "CatalogStarSelectorTask" 

# \copybrief CatalogStarSelectorTask 

# \} 

 

 

@pexConfig.registerConfigurable("catalog", sourceSelectorRegistry) 

class CatalogStarSelectorTask: 

"""Select stars based on a reference catalog. 

 

Attributes 

---------- 

usesMatches : `bool` 

A boolean variable specify if the inherited source selector uses 

matches to an external catalog, and thus requires the ``matches`` 

argument to ``run()``. Set to True for this selector. 

""" 

ConfigClass = CatalogStarSelectorConfig 

usesMatches = True # `run` and `selectStars` require the `matches` argument 

 

def selectSources(self, sourceCat, matches=None, exposure=None): 

"""Return a selection of sources based on reference catalog matches. 

 

Parameters 

---------- 

sourceCat : `lsst.afw.table.SourceCatalog` 

Catalog of sources to select from. 

This catalog must be contiguous in memory. 

matches : `list` of `lsst.afw.table.ReferenceMatch` 

A match vector as produced by meas_astrom; required. 

exposure : `lsst.afw.image.Exposure` or None 

The exposure the catalog was built from; used for debug display. 

 

Return 

------ 

struct : `lsst.pipe.base.Struct` 

Result struct with components: 

 

- selected : Boolean array of sources that were selected, same 

length as sourceCat (`numpy.ndarray` of `bool`) 

""" 

import lsstDebug 

debugInfo = lsstDebug.Info(__name__) 

display = debugInfo.display 

pauseAtEnd = debugInfo.pauseAtEnd # pause when done 

 

if matches is None: 

raise RuntimeError("CatalogStarSelectorTask requires matches") 

 

mi = exposure.getMaskedImage() 

 

if display: 

frame = 1 

ds9.mtv(mi, frame=frame, title="PSF candidates") 

 

isGoodSource = CheckSource(sourceCat, self.config.fluxLim, self.config.fluxMax, self.config.badFlags) 

good = np.array([isGoodSource(record) for record in sourceCat]) 

 

with ds9.Buffering(): 

for ref, source, d in matches: 

if not ref.get("resolved"): 

if not isGoodSource(source): 

symb, ctype = "+", ds9.RED 

else: 

symb, ctype = "+", ds9.GREEN 

 

if display: 

ds9.dot(symb, source.getX() - mi.getX0(), source.getY() - mi.getY0(), 

size=4, frame=frame, ctype=ctype) 

 

if display and pauseAtEnd: 

input("Continue? y[es] p[db] ") 

 

return Struct(selected=good)