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_instrument.py
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_instrument.py
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# This file is part of obs_cfht.
#
# Developed for the LSST Data Management System.
# This product includes software developed by the LSST Project
# (http://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 <http://www.gnu.org/licenses/>.
"""Butler instrument description for the CFHT MegaCam camera.
"""
__all__ = ("MegaPrime",)
import os
from functools import lru_cache
from astro_metadata_translator import MegaPrimeTranslator
from lsst.afw.cameraGeom import makeCameraFromPath, CameraConfig
from lsst.obs.base import Instrument, VisitSystem
from .cfhtFilters import MEGAPRIME_FILTER_DEFINITIONS
from lsst.utils.introspection import get_full_type_name
from lsst.utils import getPackageDir
class MegaPrime(Instrument):
filterDefinitions = MEGAPRIME_FILTER_DEFINITIONS
policyName = "megacam"
obsDataPackage = None
translatorClass = MegaPrimeTranslator
def __init__(self, **kwargs):
super().__init__(**kwargs)
packageDir = getPackageDir("obs_cfht")
self.configPaths = [os.path.join(packageDir, "config")]
@classmethod
def getName(cls):
return "MegaPrime"
def getCamera(self):
path = os.path.join(getPackageDir("obs_cfht"), self.policyName, "camera")
return self._getCameraFromPath(path)
@staticmethod
@lru_cache()
def _getCameraFromPath(path):
"""Return the camera geometry given solely the path to the location
of that definition."""
config = CameraConfig()
config.load(os.path.join(path, "camera.py"))
return makeCameraFromPath(
cameraConfig=config,
ampInfoPath=path,
shortNameFunc=lambda name: name.replace(" ", "_"),
)
def register(self, registry, update=False):
camera = self.getCamera()
obsMax = 2**31
with registry.transaction():
registry.syncDimensionData(
"instrument",
{
"name": self.getName(), "detector_max": 36, "visit_max": obsMax, "exposure_max": obsMax,
"class_name": get_full_type_name(self),
# Some schemas support default visit_system
"visit_system": VisitSystem.ONE_TO_ONE.value,
},
update=update
)
for detector in camera:
registry.syncDimensionData(
"detector",
{
"instrument": self.getName(),
"id": detector.getId(),
"full_name": detector.getName(),
"name_in_raft": detector.getName(),
"raft": None, # MegaPrime does not have rafts
"purpose": str(detector.getType()).split(".")[-1],
},
update=update
)
self._registerFilters(registry, update=update)
def getRawFormatter(self, dataId):
# local import to prevent circular dependency
from .rawFormatter import MegaPrimeRawFormatter
return MegaPrimeRawFormatter