Coverage for python/lsst/obs/lsstSim/makeLsstSimRawVisitInfo.py : 38%

# 

# 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/>. 

# 

from __future__ import absolute_import 

from __future__ import division 

from __future__ import print_function 

import astropy.units 

from lsst.afw.image import VisitInfo, RotType 

from lsst.afw.geom import degrees, SpherePoint 

from lsst.afw.coord import Observatory, Weather 

from lsst.afw.coord.refraction import defaultWeather 

from lsst.obs.base import MakeRawVisitInfo 

__all__ = ["MakeLsstSimRawVisitInfo"] 

class MakeLsstSimRawVisitInfo(MakeRawVisitInfo): 

"""Make a VisitInfo from the FITS header of a raw LSST simulated image 

The convention for ROTANG is as follows: 

at 0 degrees E = +Y CCD = -X Focal Plane, N = +X CCD = +Y Focal Plane: 0 boresightRotAng 

at 90 degrees E = -X CCD = -Y Focal Plane, N = +Y CCD = -X Focal Plane: 270 boresightRotAng 

So boresightRotAng = -ROTANG 

""" 

observatory = Observatory(-70.749417*degrees, -30.244633*degrees, 2663) # long, lat, elev 

def setArgDict(self, md, argDict): 

"""Set an argument dict for VisitInfo and pop associated metadata 

@param[in,out] md metadata, as an lsst.daf.base.PropertyList or PropertySet 

@param[in,out] argdict a dict of arguments 

""" 

MakeRawVisitInfo.setArgDict(self, md, argDict) 

argDict["darkTime"] = self.popFloat(md, "DARKTIME") 

argDict["boresightAzAlt"] = SpherePoint( 

self.popAngle(md, "AZIMUTH"), 

self.altitudeFromZenithDistance(self.popAngle(md, "ZENITH")), 

) 

argDict["boresightRaDec"] = SpherePoint( 

self.popAngle(md, "RA_DEG"), 

self.popAngle(md, "DEC_DEG"), 

) 

argDict["boresightAirmass"] = self.popFloat(md, "AIRMASS") 

argDict["boresightRotAngle"] = -self.popAngle(md, "ROTANG") 

argDict["rotType"] = RotType.SKY 

argDict["observatory"] = self.observatory 

weather = defaultWeather(self.observatory.getElevation()) 

temperature = self.defaultMetadata(self.popFloat(md, "TEMPERA"), weather.getAirTemperature(), 

minimum=-10, maximum=40.) 

pressure = self.defaultMetadata(self.pascalFromMmHg(self.popFloat(md, "PRESS")), 

weather.getAirPressure(), minimum=50000., maximum=90000.) 

humidity = 40. # Not currently supplied by phosim, so set to a typical value. 

argDict["weather"] = Weather(temperature, pressure, humidity) 

longitude = argDict["observatory"].getLongitude() 

RA = argDict["boresightRaDec"][0] 

# phosim doesn't supply LST, HA, or UT1, and the alt/az/ra/dec/time can be inconsistent. 

# We will leave ERA as NaN until a better answer is available. 

try: 

# Other simulation tools don't have the same problem, and need hour angle if it is available. 

HA = self.popAngle(md, "HA", units=astropy.units.h) 

argDict['era'] = HA + RA - longitude 

except Exception: 

self.log.warn("Hour angle missing from metadata, will be NAN") 

return VisitInfo(**argDict) 

def getDateAvg(self, md, exposureTime): 

"""Return date at the middle of the exposure 

@param[in,out] md FITS metadata; changed in place 

@param[in] exposureTime exposure time in sec 

""" 

startDate = self.popMjdDate(md, "TAI", timesys="TAI") 

return self.offsetDate(startDate, 0.5*exposureTime)