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# 

# LSST Data Management System 

# Copyright 2016 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/>. 

# 

 

import os.path 

import lsst.afw.image.utils as afwImageUtils 

import lsst.geom as geom 

import lsst.afw.image as afwImage 

from lsst.afw.fits import readMetadata 

from lsst.obs.base import CameraMapper 

from lsst.daf.persistence import Policy 

from .monocam import Monocam 

 

__all__ = ["MonocamMapper"] 

 

 

class MonocamMapper(CameraMapper): 

packageName = 'obs_monocam' 

 

def __init__(self, inputPolicy=None, **kwargs): 

policyFile = Policy.DefaultPolicyFile(self.packageName, "monocamMapper.yaml", "policy") 

policy = Policy(policyFile) 

 

CameraMapper.__init__(self, policy, os.path.dirname(policyFile), **kwargs) 

 

# Ensure each dataset type of interest knows about the full range of 

# keys available from the registry 

keys = {'visit': int, 

'ccd': int, 

'filter': str, 

'date': str, 

'expTime': float, 

'object': str, 

'imageType': str, 

} 

for name in ("raw", "raw_amp", 

# processCcd outputs 

"postISRCCD", "calexp", "postISRCCD", "src", "icSrc", "srcMatch", 

): 

self.mappings[name].keyDict.update(keys) 

 

# @merlin, you should swap these out for the filters you actually 

# intend to use. 

self.filterIdMap = {'u': 0, 'g': 1, 'r': 2, 'i': 3, 'z': 4, 'y': 5} 

 

# The LSST Filters from L. Jones 04/07/10 

afwImageUtils.defineFilter('u', 364.59) 

afwImageUtils.defineFilter('g', 476.31, alias=["SDSSG"]) 

afwImageUtils.defineFilter('r', 619.42, alias=["SDSSR"]) 

afwImageUtils.defineFilter('i', 752.06, alias=["SDSSI"]) 

afwImageUtils.defineFilter('z', 866.85, alias=["SDSSZ"]) 

afwImageUtils.defineFilter('y', 971.68, alias=['y4']) # official y filter 

afwImageUtils.defineFilter('NONE', 0.0, alias=['no_filter', "OPEN"]) 

 

def _extractDetectorName(self, dataId): 

return "0" 

 

def _computeCcdExposureId(self, dataId): 

"""Compute the 64-bit (long) identifier for a CCD exposure. 

 

@param dataId (dict) Data identifier with visit 

""" 

visit = dataId['visit'] 

return int(visit) 

 

def bypass_ccdExposureId(self, datasetType, pythonType, location, dataId): 

return self._computeCcdExposureId(dataId) 

 

def bypass_ccdExposureId_bits(self, datasetType, pythonType, location, dataId): 

return 41 

 

def validate(self, dataId): 

visit = dataId.get("visit") 

if visit is not None and not isinstance(visit, int): 

dataId["visit"] = int(visit) 

return dataId 

 

def _setCcdExposureId(self, propertyList, dataId): 

propertyList.set("Computed_ccdExposureId", self._computeCcdExposureId(dataId)) 

return propertyList 

 

def _makeCamera(self, policy, repositoryDir): 

"""Make a camera (instance of lsst.afw.cameraGeom.Camera) describing 

the camera geometry 

""" 

return Monocam() 

 

def bypass_defects(self, datasetType, pythonType, location, dataId): 

""" since we have no defects, return an empty list. Fix this when 

defects exist """ 

return [afwImage.DefectBase(geom.Box2I(geom.Point2I(x0, y0), geom.Point2I(x1, y1))) for 

x0, y0, x1, y1 in ( 

# These may be hot pixels, but we'll treat them as bad 

# until we can get more data 

(3801, 666, 3805, 669), 

(3934, 582, 3936, 589), 

)] 

 

def _defectLookup(self, dataId): 

""" This function needs to return a non-None value otherwise the 

mapper gives up on trying to find the defects. I wanted to be able to 

return a list of defects constructed in code rather than reconstituted 

from persisted files, so I return a dummy value. 

""" 

return "hack" 

 

def bypass_raw(self, datasetType, pythonType, location, dataId): 

"""Read raw image with hacked metadata""" 

filename = location.getLocations()[0] 

md = self.bypass_raw_md(datasetType, pythonType, location, dataId) 

image = afwImage.DecoratedImageU(filename) 

image.setMetadata(md) 

return self.std_raw(image, dataId) 

 

def bypass_raw_md(self, datasetType, pythonType, location, dataId): 

"""Read metadata for raw image, adding fake Wcs""" 

filename = location.getLocations()[0] 

md = readMetadata(filename, 1) # 1 = PHU 

return md 

 

bypass_raw_amp = bypass_raw 

bypass_raw_amp_md = bypass_raw_md 

 

def standardizeCalib(self, dataset, item, dataId): 

"""Standardize a calibration image read in by the butler 

 

Some calibrations are stored on disk as Images instead of MaskedImages 

or Exposures. Here, we convert it to an Exposure. 

 

@param dataset Dataset type (e.g., "bias", "dark" or "flat") 

@param item The item read by the butler 

@param dataId The data identifier (unused, included for future 

flexibility) 

@return standardized Exposure 

""" 

mapping = self.calibrations[dataset] 

if "MaskedImage" in mapping.python: 

exp = afwImage.makeExposure(item) 

elif "Image" in mapping.python: 

if hasattr(item, "getImage"): # For DecoratedImageX 

item = item.getImage() 

exp = afwImage.makeExposure(afwImage.makeMaskedImage(item)) 

elif "Exposure" in mapping.python: 

exp = item 

else: 

raise RuntimeError("Unrecognised python type: %s" % mapping.python) 

 

parent = super(CameraMapper, self) 

if hasattr(parent, "std_" + dataset): 

return getattr(parent, "std_" + dataset)(exp, dataId) 

return self._standardizeExposure(mapping, exp, dataId) 

 

def std_bias(self, item, dataId): 

return self.standardizeCalib("bias", item, dataId) 

 

def std_dark(self, item, dataId): 

exp = self.standardizeCalib("dark", item, dataId) 

return exp 

 

def std_flat(self, item, dataId): 

return self.standardizeCalib("flat", item, dataId) 

 

def std_fringe(self, item, dataId): 

return self.standardizeCalib("flat", item, dataId)