loadIndexedReferenceObjects.py

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#
# LSST Data Management System
#
# Copyright 2008-2017  AURA/LSST.
#
# 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.
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# You should have received a copy of the LSST License Statement and
# the GNU General Public License along with this program.  If not,
# see <https://www.lsstcorp.org/LegalNotices/>.
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__all__ = ["LoadIndexedReferenceObjectsConfig", "LoadIndexedReferenceObjectsTask"]
 
from .loadReferenceObjects import hasNanojanskyFluxUnits, convertToNanojansky, getFormatVersionFromRefCat
from lsst.meas.algorithms import getRefFluxField, LoadReferenceObjectsTask, LoadReferenceObjectsConfig
import lsst.afw.table as afwTable
import lsst.pex.config as pexConfig
import lsst.pipe.base as pipeBase
from .indexerRegistry import IndexerRegistry
 
 
class LoadIndexedReferenceObjectsConfig(LoadReferenceObjectsConfig):
    ref_dataset_name = pexConfig.Field(
        dtype=str,
        default='cal_ref_cat',
        doc='Name of the ingested reference dataset'
    )
 
 
class LoadIndexedReferenceObjectsTask(LoadReferenceObjectsTask):
    """Load reference objects from an indexed catalog ingested by
    IngestIndexReferenceTask.
 
    Parameters
    ----------
    butler : `lsst.daf.persistence.Butler`
        Data butler for reading catalogs
    """
    ConfigClass = LoadIndexedReferenceObjectsConfig
    _DefaultName = 'LoadIndexedReferenceObjectsTask'
 
    def __init__(self, butler, *args, **kwargs):
        LoadReferenceObjectsTask.__init__(self, *args, **kwargs)
        self.dataset_configdataset_config = butler.get("ref_cat_config", name=self.config.ref_dataset_name, immediate=True)
        self.indexerindexer = IndexerRegistry[self.dataset_configdataset_config.indexer.name](self.dataset_configdataset_config.indexer.active)
        # This needs to come from the loader config, not the dataset_config since directory aliases can
        # change the path where the shards are found.
        self.ref_dataset_nameref_dataset_name = self.config.ref_dataset_name
        self.butlerbutlerbutler = butler
 
    @pipeBase.timeMethod
    def loadSkyCircle(self, ctrCoord, radius, filterName=None, epoch=None, centroids=False):
        shardIdList, isOnBoundaryList = self.indexerindexer.getShardIds(ctrCoord, radius)
        shards = self.getShardsgetShards(shardIdList)
        refCat = self.butlerbutlerbutler.get('ref_cat',
                                 dataId=self.indexerindexer.makeDataId('master_schema', self.ref_dataset_nameref_dataset_name),
                                 immediate=True)
 
        # load the catalog, one shard at a time
        for shard, isOnBoundary in zip(shards, isOnBoundaryList):
            if shard is None:
                continue
            if isOnBoundary:
                refCat.extend(self._trimToCircle_trimToCircle(shard, ctrCoord, radius))
            else:
                refCat.extend(shard)
 
        # make sure catalog is contiguous: must do this before PM calculations
        if not refCat.isContiguous():
            refCat = refCat.copy(True)
 
        # apply proper motion corrections
        self.applyProperMotionsapplyProperMotions(refCat, epoch)
 
        # update version=0 style refcats to have nJy fluxes
        if self.dataset_configdataset_config.format_version == 0 or not hasNanojanskyFluxUnits(refCat.schema):
            self.log.warning("Found version 0 reference catalog with old style units in schema.")
            self.log.warning("run `meas_algorithms/bin/convert_refcat_to_nJy.py` to convert fluxes to nJy.")
            self.log.warning("See RFC-575 for more details.")
            refCat = convertToNanojansky(refCat, self.log)
        else:
            # For version >= 1, the version should be in the catalog header,
            # too, and should be consistent with the version in the config.
            catVersion = getFormatVersionFromRefCat(refCat)
            if catVersion != self.dataset_configdataset_config.format_version:
                raise RuntimeError(f"Format version in reference catalog ({catVersion}) does not match"
                                   f" format_version field in config ({self.dataset_config.format_version})")
 
        self._addFluxAliases_addFluxAliases(refCat.schema)
        fluxField = getRefFluxField(schema=refCat.schema, filterName=filterName)
 
        if centroids:
            # add and initialize centroid and hasCentroid fields (these are
            # added after loading to avoid wasting space in the saved catalogs)
            # the new fields are automatically initialized to (nan, nan) and
            # False so no need to set them explicitly
            mapper = afwTable.SchemaMapper(refCat.schema, True)
            mapper.addMinimalSchema(refCat.schema, True)
            mapper.editOutputSchema().addField("centroid_x", type=float)
            mapper.editOutputSchema().addField("centroid_y", type=float)
            mapper.editOutputSchema().addField("hasCentroid", type="Flag")
            expandedCat = afwTable.SimpleCatalog(mapper.getOutputSchema())
            expandedCat.extend(refCat, mapper=mapper)
            refCat = expandedCat
 
        # return reference catalog
        return pipeBase.Struct(
            refCat=refCat,
            fluxField=fluxField,
        )
 
    def getShards(self, shardIdList):
        """Get shards by ID.
 
        Parameters
        ----------
        shardIdList : `list` of `int`
            A list of integer shard ids.
 
        Returns
        -------
        catalogs : `list` of `lsst.afw.table.SimpleCatalog`
            A list of reference catalogs, one for each entry in shardIdList.
        """
        shards = []
        for shardId in shardIdList:
            if self.butlerbutlerbutler.datasetExists('ref_cat',
                                         dataId=self.indexerindexer.makeDataId(shardId, self.ref_dataset_nameref_dataset_name)):
                shards.append(self.butlerbutlerbutler.get('ref_cat',
                                              dataId=self.indexerindexer.makeDataId(shardId, self.ref_dataset_nameref_dataset_name),
                                              immediate=True))
        return shards
 
    def _trimToCircle(self, refCat, ctrCoord, radius):
        """Trim a reference catalog to a circular aperture.
 
        Parameters
        ----------
        refCat : `lsst.afw.table.SimpleCatalog`
            Reference catalog to be trimmed.
        ctrCoord : `lsst.geom.SpherePoint`
            ICRS center of search region.
        radius : `lsst.geom.Angle`
            Radius of search region.
 
        Returns
        -------
        catalog : `lsst.afw.table.SimpleCatalog`
            Catalog containing objects that fall in the circular aperture.
        """
        tempCat = type(refCat)(refCat.schema)
        for record in refCat:
            if record.getCoord().separation(ctrCoord) < radius:
                tempCat.append(record)
        return tempCat