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# This file is part of obs_test. 

# 

# 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/>. 

# 

__all__ = ["MakeTestRawVisitInfo"] 

 

from lsst.afw.image import VisitInfo, RotType 

from lsst.geom import degrees, SpherePoint 

from lsst.afw.coord import Observatory, Weather 

from lsst.obs.base import MakeRawVisitInfo 

 

 

class MakeTestRawVisitInfo(MakeRawVisitInfo): 

"""Make a VisitInfo from the FITS header of a test image. 

 

Notes 

----- 

Since the test data is extracted from LSST Sim data, 

this is a copy of MakeLsstSimRawVisitInfo 

(using a copy avoids undesireable dependencies). 

""" 

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. 

 

Parameters 

---------- 

md : `lsst.daf.base.PropertySet` 

Image metadata. 

argDict : `dict` 

A dict of arguments for the `lsst.afw.image.VisitInfo` 

constructor. Updated by this call. 

 

Returns 

------- 

visitInfo : `lsst.afw.image.VisitInfo` 

Visit information. 

""" 

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 

argDict["weather"] = Weather( 

self.popFloat(md, "TEMPERA"), 

self.pascalFromMmHg(self.popFloat(md, "PRESS")), 

float("nan"), 

) 

return VisitInfo(**argDict) 

 

def getDateAvg(self, md, exposureTime): 

"""Return date at the middle of the exposure. 

 

Parameters 

---------- 

md : `lsst.daf.base.PropertySet` 

Image metadata. 

exposureTime : `float` 

Exposure time, in sec 

 

Returns 

------- 

dateAvg : `lsst.daf.base.DateTime` 

Date at middle of the exposure, or `lsst.daf.base.DateTime()` 

if the metadata item ``TAI`` is not found. 

""" 

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

return self.offsetDate(startDate, 0.5*exposureTime)