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# This file is part of ip_diffim. 

# 

# Developed for the LSST Data Management System. 

# This product includes software developed by the LSST Project 

# (https://www.lsst.org). 

# See the COPYRIGHT file at the top-level directory of this distribution 

# for details of code ownership. 

# 

# 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 GNU General Public License 

# along with this program. If not, see <https://www.gnu.org/licenses/>. 

 

import numpy as np 

 

from lsst.pipe.base import Struct 

import lsst.pex.config as pexConfig 

import lsst.afw.display as afwDisplay 

import lsst.meas.algorithms as measAlg 

 

__all__ = ["DiaCatalogSourceSelectorConfig", "DiaCatalogSourceSelectorTask"] 

 

 

class DiaCatalogSourceSelectorConfig(measAlg.BaseStarSelectorConfig): 

# Selection cuts on the input source catalog 

34 ↛ exitline 38 didn't finish the lambda on line 38 fluxLim = pexConfig.Field( 

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

dtype=float, 

default=0.0, 

check=lambda x: x >= 0.0, 

) 

40 ↛ exitline 44 didn't finish the lambda on line 44 fluxMax = pexConfig.Field( 

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

dtype=float, 

default=0.0, 

check=lambda x: x >= 0.0, 

) 

# Selection cuts on the reference catalog 

selectStar = pexConfig.Field( 

doc="Select objects that are flagged as stars", 

dtype=bool, 

default=True 

) 

selectGalaxy = pexConfig.Field( 

doc="Select objects that are flagged as galaxies", 

dtype=bool, 

default=False 

) 

includeVariable = pexConfig.Field( 

doc="Include objects that are known to be variable", 

dtype=bool, 

default=False 

) 

grMin = pexConfig.Field( 

doc="Minimum g-r color for selection (inclusive)", 

dtype=float, 

default=0.0 

) 

grMax = pexConfig.Field( 

doc="Maximum g-r color for selection (inclusive)", 

dtype=float, 

default=3.0 

) 

 

def setDefaults(self): 

measAlg.BaseStarSelectorConfig.setDefaults(self) 

self.badFlags = [ 

"base_PixelFlags_flag_edge", 

"base_PixelFlags_flag_interpolatedCenter", 

"base_PixelFlags_flag_saturatedCenter", 

"slot_Centroid_flag", 

] 

 

 

class CheckSource(object): 

"""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.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 

 

 

@pexConfig.registerConfigurable("diaCatalog", measAlg.sourceSelectorRegistry) 

class DiaCatalogSourceSelectorTask(measAlg.BaseSourceSelectorTask): 

"""A task that selects sources for Kernel candidates. 

 

A naive star selector based on second moments. Use with caution. 

 

Notes 

----- 

Debug Variables 

 

DiaCatalogSourceSelectorTask has a debug dictionary with the following keys: 

 

display : `bool` 

if True display debug information 

displayExposure : `bool` 

if True display exposure 

pauseAtEnd `bool` 

if True wait after displaying everything and wait for user input 

 

Examples 

-------- 

For example, put something like: 

 

.. code-block:: py 

 

import lsstDebug 

def DebugInfo(name): 

di = lsstDebug.getInfo(name) # N.b. lsstDebug.Info(name) would call us recursively 

if name.endswith("diaCatalogSourceSelector"): 

di.display = True 

 

return di 

 

lsstDebug.Info = DebugInfo 

 

into your `debug.py` file and run your task with the `--debug` flag. 

""" 

ConfigClass = DiaCatalogSourceSelectorConfig 

usesMatches = True # selectStars uses (requires) its matches argument 

 

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

"""Return a selection of sources for Kernel candidates. 

 

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. 

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

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

 

Returns 

------- 

struct : `lsst.pipe.base.Struct` 

The struct contains the following data: 

 

- selected : `array` of `bool`` 

Boolean array of sources that were selected, same length as 

sourceCat. 

""" 

import lsstDebug 

display = lsstDebug.Info(__name__).display 

displayExposure = lsstDebug.Info(__name__).displayExposure 

pauseAtEnd = lsstDebug.Info(__name__).pauseAtEnd 

 

if matches is None: 

raise RuntimeError("DiaCatalogSourceSelector requires matches") 

 

mi = exposure.getMaskedImage() 

 

if display and displayExposure: 

disp = afwDisplay.Display(frame=lsstDebug.frame) 

disp.mtv(mi, title="Kernel candidates") 

# 

# Look for flags in each Source 

# 

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

 

# Go through and find all the acceptable candidates in the catalogue 

selected = np.zeros(len(sourceCat), dtype=bool) 

 

if display and displayExposure: 

symbs = [] 

ctypes = [] 

 

doColorCut = True 

 

refSchema = matches[0][0].schema 

rRefFluxField = measAlg.getRefFluxField(refSchema, "r") 

gRefFluxField = measAlg.getRefFluxField(refSchema, "g") 

for i, (ref, source, d) in enumerate(matches): 

if not isGoodSource(source): 

if display and displayExposure: 

symbs.append("+") 

ctypes.append(afwDisplay.RED) 

else: 

isStar = not ref.get("resolved") 

isVar = not ref.get("photometric") 

gMag = None 

rMag = None 

if doColorCut: 

try: 

gMag = -2.5 * np.log10(ref.get(gRefFluxField)) 

rMag = -2.5 * np.log10(ref.get(rRefFluxField)) 

except KeyError: 

self.log.warn("Cannot cut on color info; fields 'g' and 'r' do not exist") 

doColorCut = False 

isRightColor = True 

else: 

isRightColor = (gMag-rMag) >= self.config.grMin and (gMag-rMag) <= self.config.grMax 

 

isRightType = (self.config.selectStar and isStar) or (self.config.selectGalaxy and not isStar) 

isRightVar = (self.config.includeVariable) or (self.config.includeVariable is isVar) 

if isRightType and isRightVar and isRightColor: 

selected[i] = True 

if display and displayExposure: 

symbs.append("+") 

ctypes.append(afwDisplay.GREEN) 

elif display and displayExposure: 

symbs.append("o") 

ctypes.append(afwDisplay.BLUE) 

 

if display and displayExposure: 

disp = afwDisplay.Display(frame=lsstDebug.frame) 

with disp.Buffering(): 

for (ref, source, d), symb, ctype in zip(matches, symbs, ctypes): 

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

size=4, ctype=ctype) 

 

if display: 

lsstDebug.frame += 1 

if pauseAtEnd: 

input("Continue? y[es] p[db] ") 

 

return Struct(selected=selected)