show_obs.py
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#! /usr/bin/env python
# ==========================================================================
# Display summary of observation definition XML file
#
# Copyright (C) 2016 Michael Mayer
#
# 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/>.
#
# ==========================================================================
import sys
import gammalib
import cscripts
try:
import matplotlib.pyplot as plt
plt.figure()
plt.close()
except:
print('This script needs the "matplotlib" module')
sys.exit()
# ==================== #
# Run csobsinfo script #
# ==================== #
def run_csobsinfo(filename, ra=None, dec=None, debug=True):
"""
Run csobsinfo script
Parameters
----------
filename : str
File name of observation definition XML file
ra : float, optional
Target Right Ascension (deg)
dec : float, optional
Target declination of pointing (deg)
debug : bool, optional
Switch on debugging in csobsinfo run
Returns
-------
info : `~cscripts.csobsinfo`
csobsinfo instance
"""
# Get observation definition XML filename
obsdef = gammalib.GFilename(filename)
# Setup csobsinfo script
info = cscripts.csobsinfo()
info['inobs'] = obsdef.url()
info['debug'] = debug
# Set offset
if ra != None and dec != None:
info['ra'] = ra
info['dec'] = dec
info['offset'] = True
else:
info['offset'] = False
# Run csobsinfo
info.run()
# Return
return info
# ================ #
# Plot information #
# ================ #
def plot_information(info, plotfile=''):
"""
Plot information
Parameters
----------
info : `~cscripts.csobsinfo`
csobsinfo instance
plotfile : str, optional
Plot filename
"""
# Retrieve observation info
zeniths = info.zeniths()
azimuths = info.azimuths()
offsets = info.offsets()
ebounds = info.ebounds()
gti = info.gti()
# Create figure with subplots
nrows = 2
ncols = 2
if info['offset'].boolean() and ebounds.size() > 0:
ncols += 1
iplot = 1
plt.figure()
plt.subplot(nrows, ncols, iplot)
# Plot zenith angle distribution
zmin = min(zeniths)
zmax = max(zeniths)
plt.hist(zeniths, bins=30, range=(zmin, zmax), fc='blue')
plt.xlabel('Zenith Angle (deg)')
plt.ylabel('Frequency')
plt.title('Zenith angle distribution')
# Plot azimuth angle distribution
iplot += 1
plt.subplot(nrows, ncols, iplot)
amin = min(azimuths)
amax = max(azimuths)
plt.hist(azimuths, bins=30, range=(amin, amax), fc='blue')
plt.xlabel('Azimuth Angle (deg)')
plt.ylabel('Frequency')
plt.title('Azimuth distribution')
# Plot offset if possible
if info['offset'].boolean():
iplot += 1
plt.subplot(nrows, ncols, iplot)
omin = min(offsets)
omax = max(offsets)
plt.hist(offsets, bins=30, range=(omin, omax), fc='blue')
plt.xlabel('Offset from (RA, DEC)=('+str(ra)+','+str(dec)+') (deg)')
plt.ylabel('Frequency')
plt.title('Offset distribution')
# Plot energy thresholds if possible
if ebounds.size() > 0:
emin = []
emax = []
for i in range(ebounds.size()):
emin.append(ebounds.emin(i).log10TeV())
emax.append(ebounds.emax(i).log10TeV())
iplot += 1
plt.subplot(nrows, ncols, iplot)
plt.hist(emin, bins=80, range=(-1.0, 2.0), fc='red', label='emin')
plt.hist(emax, bins=80, range=(-1.0, 2.0), fc='blue', label='emax')
plt.xlabel('Energy threshold (log10 (E/TeV))')
plt.ylabel('Frequency')
plt.legend(loc='upper left')
plt.title('Energy threshold')
# Plot observation point in time wrt zenith angle
iplot += 1
plt.subplot(nrows, ncols, iplot)
times = []
for i in range(gti.size()):
tmean = gti.tstart(i) + 0.5*(gti.tstart(i)-gti.tstart(i))
times.append(tmean.mjd())
plt.plot(times, zeniths, 'o', lw=2.0, color='black')
plt.xlabel('Time (MJD)')
plt.ylabel('Zenith Angle (deg)')
plt.title('Observation time')
# Show plots or save it into file
if len(plotfile) > 0:
plt.savefig(plotfile)
else:
plt.show()
# Return
return
# ======================== #
# Main routine entry point #
# ======================== #
if __name__ == '__main__':
# Print usage message if wrong number of arguments is provided
if len(sys.argv) < 2:
sys.exit('Usage: inspect_obs.py inobs.xml [ra] [dec] [file]')
# Extract optional parameters
plotfile = ''
ra = None
dec = None
if len(sys.argv) == 3:
plotfile = sys.argv[2]
elif len(sys.argv) == 4:
ra = float(sys.argv[2])
dec = float(sys.argv[3])
# Run csobsinfo
info = run_csobsinfo(sys.argv[1], ra=ra, dec=dec)
# Plot information
plot_information(info, plotfile=plotfile)