def get_angles():
global sun_angle_i, moon_angle_i, sun_alt_i, moon_alt_i, obj_alt_i
global times, PI, loc
global dist_sun, dist_moon, alt_s, alt_m, alt_o, obj_alt, sun_angle, moon_angle, sun_alt, moon_alt, dist_s, dist_m
"""read in from entry boxes"""
sun_angle = float(sun_angle_i.get())
moon_angle = float(moon_angle_i.get())
sun_alt = float(sun_alt_i.get())
moon_alt = float(moon_alt_i.get())
obj_alt = float(obj_alt_i.get())
"""whether or not the object is far enough away"""
"""this returns values in the range [0, 180]; negatives do not matter"""
dist_s = [abs(i) > sun_angle for i in dist_sun]
dist_m = [abs(i) > moon_angle for i in dist_moon]
"""whether or not the altitudes are low enough"""
alt_s = (coords_s.transform_to(
coordinates.AltAz(obstime=times + offset * u.hour,
location=loc)).alt.degree < sun_alt)
alt_m = (coords_m.transform_to(
coordinates.AltAz(obstime=times + offset * u.hour,
location=loc)).alt.degree < moon_alt)
"""object's altitude in degrees"""
true_alt_o = (coords_o.transform_to(
coordinates.AltAz(obstime=times + offset * u.hour,
location=loc)).alt.degree)
"""whether or not the altitude is high enough"""
alt_o = (true_alt_o > obj_alt)
"""change button after press"""
separ_button.config(fg='black', bg='#FFE100')
def altaz2radec(az, alt, t):
""" Convert Azimuth-Elevation coordinates into RA-Dec equatorial coordinates
It is expected that the observer is NenuFAR in Nancay
The conversion is computed for a sky set at time t
Parameters
----------
az : float
Azimuth in degrees
alt : float
Elevation in degrees
t : str or Time
Time at which to compute the corresponding RA Dec
Returns
-------
RA : float
Right Ascension in radians
Dec : float
Declination in radians
"""
if not isinstance(t, Time):
try:
t = Time(t)
except:
raise ValueError(
"\n\t=== Time syntax should be 'YYYY-MM-DD hh:mm:ss' ===")
frame = coord.AltAz(obstime=t, location=nancay())
altaz = coord.SkyCoord(az * u.deg, alt * u.deg, frame=frame)
radec = altaz.transform_to(coord.FK5(equinox='J2000'))
return radec.ra.rad, radec.dec.rad
def _calc(self, datetime, lat: str, lon: str, height=0.0):
"""Calculate the azimuth and elevation of the sun.
Calculates the azimuth and elevation of the sun as seen from the specified
time and place (latitude, longitude, sea level).
Args:
datetime (datetime): datetime to calculate. (aware instance)
lat (str): latitude.
lon (str): longitude.
height (float, optional): height above sea level. Default to 0.0
Returns:
az (float): azimuth of sun.
el (float): elevation of sun.
"""
time = ap_t.Time(datetime)
loc = ap_crd.EarthLocation(
lat=ap_crd.Angle(lat), lon=ap_crd.Angle(lon), height=height
)
sun = ap_crd.get_sun(time).transform_to(
ap_crd.AltAz(obstime=time, location=loc)
)
az = sun.az.degree
el = sun.alt.degree
return az, el
def triangulate(self, v2_v1, v3_v2):
"""
Used to triangulate the true latitude and longitude corresponding to the norm of the telescope position.
Input
------
v2_v1: list [args,len=2,dtype=float]
The difference in [azimuth,altitude] between object 2 and object 1
v3_v2: list [args,len=2,dtype=float]
The difference in [azimuth,altitude] between object 3 and object 2
"""
ra = cp.Angle(self.cel_calib["RA"], unit=u.hourangle)
dec = cp.Angle(self.cel_calib["DEC"], unit=u.deg)
v = np.array([ra.rad, dec.rad]).T
out = self.triangulation_class.triangulate(v[0], v[1], v[2], v2_v1,
v3_v2)
n = cp.SkyCoord(out[0][0], out[0][1], unit=u.rad, frame='icrs')
npr = cp.EarthLocation(lon=0 * u.deg, lat=90 * u.deg, height=0 * u.m)
n.location = npr
n.obstime = self.time
[self.lon, self.lat] = [180 - n.altaz.az.deg, n.altaz.alt.deg]
self.home = [self.lon, self.lat]
h = cp.EarthLocation(self.home[0] * u.deg, self.home[1] * u.deg)
self.tel_frame = cp.AltAz(location=h, obstime=self.time)
v3 = cp.SkyCoord(v[2][0], v[2][1], unit=u.rad)
self.tel_pos = v3
def trailPointToAzAlt(visitInfo, wcs, trailPoint, dateOverride, loc):
"""Get the Azimuth and Altitude corresponding to an x, y image position.
Parameters
----------
visitInfo : `lsst.afw.image.VisitInfo`
Dict-like metadata for the image.
wcs : `lsst.afw.geom.SkyWcs`
The WCS for the image.
trailPoint : `list` with 2 values
[x, y] coordinates of a point in image, in pixels
dateOverride : `str` or `None`
If the visitInfo date is wrong, this permits a user to pass along
the correct date to use. Must be e.g. '2020-01-01' format.
loc : `str`
One of astropy.coordinates.EarthLocation.get_site_names()
Such as "Cerro Tololo Interamerican Observatory" or "Subaru Telescope"
Returns
-------
aa.az : `astropy.Quantity`
Azimuth angle
aa.alt : `astropy.Quantity`
Altitude angle
"""
dateObsAstropy = getDateObsAstropy(visitInfo, dateOverride)
sky_coord_afw = wcs.pixelToSky(
lsst.geom.Point2D(trailPoint[0], trailPoint[1]))
sky_coord = coord.SkyCoord(sky_coord_afw.getRa().asDegrees() * u.deg,
sky_coord_afw.getDec().asDegrees() * u.deg)
location = coord.EarthLocation.of_site(loc)
aa_frame = coord.AltAz(obstime=dateObsAstropy, location=location)
aa = sky_coord.transform_to(aa_frame)
return aa.az, aa.alt
def __compute_azimuth_and_altitude(self):
try:
alt_and_az = coord.AltAz(location=self.pic_location, obstime=self.pic_datetime)
self.altitude = self.sun.transform_to(alt_and_az).alt.degree
self.azimuth = self.sun.transform_to(alt_and_az).az.degree
except Exception as e:
raise e
def __init__(self, centers, time, indices=None):
self.centers = centers
self.time = time
self.indices = indices
# figure out where the sun is
self.solar_coord = ac.get_sun(time)
# subset by the provided indices, if specified
if indices is None:
lats = centers.lat
lons = centers.lon
else:
lats = centers.lat[indices]
lons = centers.lon[indices]
# calculate the solar zenith angle at each pixel center.
# neglect refraction and height above geoid.
pixels = ac.EarthLocation(lons, lats, ellipsoid='GRS80')
solar_vecs = self.solar_coord.transform_to(
ac.AltAz(obstime=time, location=pixels))
# mask out the non earth pixels, unless the user specified which pixels to calculate
if indices is None:
mask = ma.getmask(centers.lon)
else:
mask = None
self.solar_zenith = ma.array(solar_vecs.zen.to_value(u.deg), mask=mask)
self.solar_az = ma.array(solar_vecs.az.to_value(u.deg), mask=mask)
def can_observe(self):
"""Check for night and weather"""
self.logger.info(self.current_time.iso)
# start by checking for 12 degree twilight
if coord.get_sun(self.current_time).transform_to(
coord.AltAz(obstime=self.current_time,
location=P48_loc)).alt.is_within_bounds(
upper=-12. * u.deg):
if self.historical_observability_year is None:
# don't use weather, just use 12 degree twilight
return True
else:
is_observable = self.observability.check_historical_observability(
self.current_time, year=self.historical_observability_year)
if not is_observable:
# optimization: fast-forward to start of next block
block_now = block_index(self.current_time)
block_end_time = block_index_to_time(block_now,
self.current_time, where='end')[0]
self.logger.info('Weathered out. Fast forwarding to end of this block: {}'.format(
block_end_time.iso))
self.current_time = block_end_time
return is_observable
else:
# daytime
# optimization: fast-forward to sunset
next_twilight = next_12deg_evening_twilight(self.current_time)
self.logger.info('Fast forwarding to 12 deg twilight: {}'.format(
next_twilight.iso))
self.current_time = next_twilight
return False
def trailPointToAzAlt(visitInfo,
wcs,
trailPoint,
loc="Cerro Tololo Interamerican Observatory"):
"""Get the Azimuth and Altitude corresponding to an x, y image position.
Parameters
----------
visitInfo : `lsst.afw.image.VisitInfo`
Dict-like metadata for the image.
wcs : `lsst.afw.geom.SkyWcs`
The WCS for the image.
trailPoint : `list` with 2 values
[x, y] coordinates of a point in image, in pixels
loc : `str`, optional
Default is "Cerro Tololo Interamerican Observatory"
"""
dateObs = visitInfo.getDate().toPython()
dateObsAstropy = Time(dateObs)
sky_coord_afw = wcs.pixelToSky(
lsst.geom.Point2D(trailPoint[0], trailPoint[1]))
sky_coord = coord.SkyCoord(sky_coord_afw.getRa().asDegrees() * u.deg,
sky_coord_afw.getDec().asDegrees() * u.deg)
location = coord.EarthLocation.of_site(loc)
aa_frame = coord.AltAz(obstime=dateObsAstropy, location=location)
aa = sky_coord.transform_to(aa_frame)
return aa.az, aa.alt
def can_observe(self):
"""Check for night and weather"""
self.logger.info(self.current_time.iso)
# start by checking for 12 degree twilight
if coord.get_sun(self.current_time).transform_to(
coord.AltAz(obstime=self.current_time,
location=P48_loc)).alt.is_within_bounds(
upper=-12. * u.deg):
if self.historical_observability_year is None:
# don't use weather, just use 12 degree twilight
return True
else:
return self.observability.check_historical_observability(
self.current_time, year=self.historical_observability_year)
else:
# daytime
# optimization: fast-forward to sunset
next_twilight = next_12deg_evening_twilight(self.current_time)
self.logger.info(
'Fast forwarding to 12 deg twilight: {}'.format(next_twilight))
# TODO: check if this works--may not be possible to change state
# here
self.current_time = next_twilight
return False
def gen_mock_obs(self):
"""
Generates fake observation data based on possible errors of +/- 5deg.
Output:
------
obs: list [args,len=2,dtype=float]
Difference in altitude and azimuth for three points, used in triangulation.
"""
# creates class object based on random errors in telescope placement
self.mock_home = [self.lon_est + np.random.uniform(-5,5)*u.deg,
self.lat_est + np.random.uniform(-5,5)*u.deg]
# creates objects based on errors
mock_loc = cp.EarthLocation(self.mock_home[0],self.mock_home[1])
surf = cp.AltAz(location=mock_loc,obstime=self.time)
pts = self.altaz_calib.transform_to(surf)
# calculate angular differences in altitude and azimuth for points
self.v2_v1 = [pts[1].az.rad - pts[0].az.rad, pts[1].alt.rad - pts[0].alt.rad]
self.v3_v2 = [pts[2].az.rad - pts[1].az.rad, pts[2].alt.rad - pts[1].alt.rad]
return [self.v2_v1, self.v3_v2]
def get_sun_state(lat: float, lon: float, t: datetime):
"""Given a time and location get the sun position relative to this location.
Args:
lat (float): latitude
lon (float): longitude
t (datetime): query time
Returns:
tuple: zenith and azimuth angles
"""
loc = coord.EarthLocation(lon=lon * u.deg, lat=lat * u.deg)
query_time_string = t.strftime("%Y-%m-%dT%H:%M:%S.%f")
t = Time(query_time_string, format="isot", scale="utc")
altaz = coord.AltAz(location=loc, obstime=t)
sun = coord.get_sun(t)
transformer = sun.transform_to(altaz)
theta_z = transformer.zen
theta_A = transformer.az
return theta_z.degree, theta_A.degree
def getSunPos(latitude, longitude, t):
loc = coord.EarthLocation(lon=longitude * u.deg, lat=latitude * u.deg)
now = Time(t)
altaz = coord.AltAz(location=loc, obstime=now)
sun = coord.get_sun(now)
result = sun.transform_to(altaz)
return result
def eff_night(cls,day_ini,earth_loc):
"""This method calculates the time range between the Sun being
at -14deg below the horizon (begin and end of night), for a single
night of observation
Inputs
- day_ini: noon of the initial day of observation, the date at which
the night starts
- earth_loc: location of the observing site, EarthLocation object
Returns
- array of astropy.time.core.Time elements, containing begin,
middle, and end of the night
"""
#sample the day by minute
aux = day_ini + np.linspace(0,24,1440) * apy_u.hour
#Sun position is in GCRS
sun1 = apy_coord.get_sun(aux)
altaz_frame = apy_coord.AltAz(obstime=aux,location=earth_loc)
sun1_altaz = sun1.transform_to(altaz_frame)
#transform AltAz to degrees
vs,v1,v2,v3 = apy_coord.Angle(sun1_altaz.alt).signed_dms
todeg = lambda w,x,y,z: w*(x + y/np.float(60) + z/np.float(60**2))
vect = np.vectorize(todeg,otypes=["f4"])
sun1_deg = vect(vs,v1,v2,v3)
#Sun position closest to -14deg, use local minima
idx_minim = signal.argrelextrema(np.abs(sun1_deg + 14),np.less)
if idx_minim[0].shape[0] != 2:
logger.error("Error setting Sun at -14deg")
exit(1)
#save time for begin, middle, and end of the night
ntime = aux[idx_minim]
midnight = apy_time.Time(apy_time.Time(np.mean(ntime.jd),format="jd"),
scale="utc",format="iso")
ntime = np.insert(ntime,1,midnight)
return ntime
def solarzenithangle(t, glat, glon, alt_m):
"""
Parameters
----------
t : datetime
time of observation
glat : float
latitude
glon : float
longitude
alt_m : float
observer altitude [meters]
Returns
-------
sza : float
solar zenith angle [degrees]
"""
obs = ac.EarthLocation(lat=glat * u.deg, lon=glon * u.deg, height=alt_m * u.m)
times = astropy.time.Time(t, scale="ut1")
sun = ac.get_sun(times)
sunobs = sun.transform_to(ac.AltAz(obstime=times, location=obs))
return 90.0 - sunobs.alt.degree
def _perform(self):
"""
Returns an Argument() with the parameters that depends on this operation.
"""
self.log.info(f"Running {self.__class__.__name__} action")
lat=c.Latitude(self.action.args.kd.get('SITELAT'), unit=u.degree)
lon=c.Longitude(self.action.args.kd.get('SITELONG'), unit=u.degree)
height=float(self.action.args.kd.get('ALT-OBS')) * u.meter
loc = c.EarthLocation(lon, lat, height)
temperature=float(self.action.args.kd.get('AMBTEMP'))*u.Celsius
pressure=self.cfg['Telescope'].getfloat('pressure', 700)*u.mbar
altazframe = c.AltAz(location=loc, obstime=self.action.args.kd.obstime(),
temperature=temperature,
pressure=pressure)
moon = c.get_moon(Time(self.action.args.kd.obstime()), location=loc)
sun = c.get_sun(Time(self.action.args.kd.obstime()))
moon_alt = ((moon.transform_to(altazframe).alt).to(u.degree)).value
moon_separation = (moon.separation(self.action.args.header_pointing).to(u.degree)).value\
if self.action.args.header_pointing is not None else None
# Moon illumination formula from Meeus, ÒAstronomical
# Algorithms". Formulae 46.1 and 46.2 in the 1991 edition,
# using the approximation cos(psi) \approx -cos(i). Error
# should be no more than 0.0014 (p. 316).
moon_illum = 50*(1 - np.sin(sun.dec.radian)*np.sin(moon.dec.radian)\
- np.cos(sun.dec.radian)*np.cos(moon.dec.radian)\
* np.cos(sun.ra.radian-moon.ra.radian))
self.action.args.moon_alt = moon_alt
self.action.args.moon_separation = moon_separation
self.action.args.moon_illum = moon_illum
return self.action.args
def calculate_elevation(tt, loc=_loc_blindern):
sun_time = Time(tt)
if ( (tt.hour == 0) and (tt.minute == 0) ):
print(f'Calculate solar elevation angle for: {sun_time}')
zen_ang = coord.get_sun(sun_time).transform_to(
coord.AltAz(obstime=sun_time, location=loc)).alt.degree
return zen_ang
def test_horizontal_to_equatorial_astropy(self):
from astropy import coordinates as coord
from astropy import units as u
from astropy import time
from astropy.time import Time
utc_date = datetime.datetime.utcnow()
loc = Dunedin
obstime = time.Time(utc_date, scale="utc")
eloc = coord.EarthLocation(
lat=loc.latitude_deg() * u.deg,
lon=loc.longitude_deg() * u.deg,
height=loc.alt * u.m,
)
altaz_frame = coord.AltAz(obstime=obstime, location=eloc)
for el, az in zip(np.linspace(0, 90, 10), np.linspace(0, 259, 10)):
elaz = coord.SkyCoord(alt=el * u.deg,
az=az * u.deg,
frame=altaz_frame)
radec = elaz.transform_to(coord.ICRS)
ra, dec = loc.horizontal_to_equatorial(utc_date,
angle.from_dms(el),
angle.from_dms(az))
self.assertAlmostEqual(
radec.ra.degree, ra.to_degrees(),
-1) # TODO better agreement should be possible.
self.assertAlmostEqual(
radec.dec.degree, dec.to_degrees(),
1) # TODO better agreement should be possible.
def air_mass(self):
mid_time = astrotime.Time(self.jd + self.exptime / 86400.,
format='jd',
scale='utc',
location=self.site)
target_altaz = self.target.transform_to(
coord.AltAz(obstime=mid_time, location=self.site))
return target_altaz.secz
def aztrack(startTime,
shotTime,
duration,
fixedElevation,
jumpFrac=0.1,
offsetScale=3.0,
**ignore_kwargs):
kpno = get_kpno()
duration = duration * u.hour
fixedElevation = fixedElevation * u.degree
offsetScale *= u.degree
# find positions within the azimuth track at the given elevation
# that are within the survey footprint
nAz = 100
altaz = coo.AltAz(alt=np.repeat(fixedElevation, nAz),
az=np.linspace(0, 360, nAz) * u.degree,
obstime=startTime,
location=kpno)
cel = altaz.transform_to(coo.FK5)
bounds = get_desi_bounds()
ii = np.where(in_desi_bounds(cel.ra, cel.dec, bounds))[0]
if len(ii) == 0:
return None
# pick the starting point randomly from the list of valid positions
np.random.shuffle(ii)
i = ii[0]
# now build up the track by making random azimuthal offsets
az = altaz[i].az
coords = [cel[i]]
azimuths = [az]
times = [startTime]
while times[-1] - startTime < duration:
dAz = offsetScale * np.random.rand()
if np.random.rand() < jumpFrac:
dAz *= -3
az = az + dAz
t = times[-1] + shotTime * u.second
a = coo.AltAz(alt=fixedElevation, az=az, obstime=t, location=kpno)
c = a.transform_to(coo.FK5)
# stop if this move takes the track out of bounds
if not in_desi_bounds(c.ra, c.dec, bounds):
break
coords.append(c)
azimuths.append(az)
times.append(t)
return dict(coords=coo.SkyCoord(coords), ut=times, azimuths=azimuths)
def alt_az(self, time, cuts=None):
"""return Altitude & Azimuth by field at a given time"""
if cuts is None:
index = self.fields.index
fieldsAltAz = self.field_coords.transform_to(
coord.AltAz(obstime=time, location=self.loc))
else:
# warning: specifying cuts makes this much slower
index = self.fields[cuts].index
fieldsAltAz = self._field_coords(cuts=cuts).transform_to(
coord.AltAz(obstime=time, location=self.loc))
return pd.DataFrame({
'alt': fieldsAltAz.alt,
'az': fieldsAltAz.az
},
index=index)
def __call__ (self, t):
"""Selects the t
t should be utc and in datetime or isot format
Arguments:
t (datetime, str) : should be parsable by astropy.Time
"""
ttime = at.Time (t, scale='utc', location=self.location)
aa = asc.AltAz (alt=self.tt, az=self.pp, obstime=ttime, location=self.location)
gc = aa.transform_to (self.gal)
return gc
def solar_zenith_angle(alt, lat, lon, time):
atime = Time(time)
loc = coord.EarthLocation.from_geodetic(
height=alt * units.km,
lat=lat * units.deg,
lon=lon * units.deg,
)
altaz = coord.AltAz(location=loc, obstime=atime)
sun = coord.get_sun(atime)
return sun.transform_to(altaz).zen.value
def sunIsDown():
"""Is the sun below the horizon?
Warning: on the 2020-Q1 PFS VMs, this takes ~70ms
"""
now = astroTime.Time(time.time(), format='unix', scale='utc')
here = coords.AltAz(obstime=now, location=subaru)
sunaltaz = coords.get_sun(now).transform_to(here)
return sunaltaz.alt.value < -2
def lookup(target: str) -> (str, str):
""" Convert a target name 'M31', 'NGC6946', to a RA/Dec pair using the location
of the observatory.
Given a string representing a target ('M 31', 'NGC 4584', 'Horsehead Nebula')
return an (RA, DEC) string tuple of the form ('hh:mm:sss', 'dd:mm:ss')
Parameters
----------
target: str
A string representing the target name
Returns
-------
ra: str
String representation of right-ascension; 'hh:mm:ss'
dec: str
String representation of declination, 'dd:mm:ss'
Notes
-----
Author: rprechelt
"""
# location of observatory
obs_location = coordinates.EarthLocation(
lat=config.general.latitude * units.deg,
lon=config.general.longitude * units.deg,
height=config.general.altitude * units.m)
obs_time = time.Time.now()
frame = coordinates.AltAz(obstime=obs_time, location=obs_location)
# planetary bodies - TODO: Add moons
solar_system = [
'mercury', 'venus', 'moon', 'mars', 'jupiter', 'saturn', 'uranus',
'neptune', 'pluto'
]
coordinates.solar_system_ephemeris.set('de432s')
# convert it all to lowercase
target = target.lower()
# we have a planetary body
if target in solar_system:
celestial_body = coordinates.get_body(target, obs_time, obs_location)
return (celestial_body.ra.to_string(unit=units.hour, sep=':'),
celestial_body.dec.to_string(unit=units.degree, sep=':'))
else: # stellar body
try:
target_coordinates = coordinates.SkyCoord.from_name(target)
return (target_coordinates.ra.to_string(unit=units.hour, sep=':'),
target_coordinates.dec.to_string(unit=units.degree,
sep=':'))
except Exception as e:
return None, None
def solang(row):
loc = coord.EarthLocation(lon=row['Longitude'] * u.deg,
lat=row['Latitude'] * u.deg)
#timy0 = timei.to_pydatetime()
timy = Time(row['date_saved'], format='datetime')
altaz = coord.AltAz(location=loc, obstime=timy)
sun = coord.get_sun(timy)
return sun.transform_to(altaz).zen.degree
def calculateSunPosition(self, ntimes):
azi_ang = np.zeros((ntimes))
elv_ang = np.zeros((ntimes))
for tt, time in enumerate(self.times):
sun_time = Time(time) #UTC time
sunpos = coord.AltAz(obstime=sun_time, location=self.location)
alt = coord.get_sun(sun_time).transform_to(sunpos).alt
azi = coord.get_sun(sun_time).transform_to(sunpos).az
elv_ang[tt] = alt.degree
azi_ang[tt] = azi.degree
self.elevation_angle = elv_ang
self.azimuth_angle = azi_ang
def list_filepaths2data(list_filepaths):
tar_ra = []
tar_dec = []
fwhm = []
date_obs = []
filters = []
jd = []
lim_mag = []
exp_time = []
iaohanle = EarthLocation(lat=32.778889 * u.deg,
lon=78.964722 * u.deg,
height=4500 * u.m)
for file in list_filepaths:
hdu = fits.open(file)[0]
data = hdu.data
header = hdu.header
tar_ra.append(header['TARRA'])
tar_dec.append(header['TARDEC'])
fwhm.append(header['MED_FWHM'])
date_obs.append(header['DATE-OBS'])
filters.append(header['FILTER'])
jd.append(header['JD'])
lim_mag.append(header['LIM_MAG'])
exp_time.append(header['EXPTIME'])
tar_ra = np.array(tar_ra)
tar_dec = np.array(tar_dec)
fwhm = np.array(fwhm)
filters = np.array(filters)
date_obs = np.array(date_obs)
observing_time = Time(date_obs)
aa = coord.AltAz(location=iaohanle, obstime=observing_time)
target = coord.SkyCoord(tar_ra * u.deg, tar_dec * u.deg, frame='icrs')
x = target.transform_to(aa)
az = x.az.value
alt = x.alt.value
table = pd.DataFrame(
{
'observing_time': jd,
'exposure_time': exp_time,
'azimuth': az,
'altitude': alt,
'fwhm': fwhm,
'lim_mag': lim_mag,
'filter': filters
},
columns=[
'observing_time', 'exposure_time', 'azimuth', 'altitude', 'fwhm',
'lim_mag', 'filter'
])
return table
def _perform(self):
"""
Returns an Argument() with the parameters that depend on this
operation.
"""
self.log.info(f"Running {self.__class__.__name__} action")
if self.action.args.imtype == 'OBJECT':
if self.action.args.header_pointing is not None:
self.log.info('Determine Moon info')
site_lat = c.Latitude(self.cfg['Telescope'].getfloat('site_lat'), unit=u.degree)
site_lon = c.Longitude(self.cfg['Telescope'].getfloat('site_lon'), unit=u.degree)
site_elevation = self.cfg['Telescope'].getfloat('site_elevation') * u.meter
loc = c.EarthLocation(site_lon, site_lat, site_elevation)
pressure = self.cfg['Telescope'].getfloat('pressure', 700)*u.mbar
obstime = Time(self.action.args.meta.get('date'), location=loc)
altazframe = c.AltAz(location=loc, obstime=obstime, pressure=pressure)
moon = c.get_moon(obstime)
sun = c.get_sun(obstime)
moon_alt = ((moon.transform_to(altazframe).alt).to(u.degree)).value
moon_separation = (moon.separation(self.action.args.header_pointing).to(u.degree)).value\
if self.action.args.header_pointing is not None else None
# Moon illumination formula from Meeus, ÒAstronomical
# Algorithms". Formulae 46.1 and 46.2 in the 1991 edition,
# using the approximation cos(psi) \approx -cos(i). Error
# should be no more than 0.0014 (p. 316).
moon_illum = 50*(1 - np.sin(sun.dec.radian)*np.sin(moon.dec.radian)\
- np.cos(sun.dec.radian)*np.cos(moon.dec.radian)\
* np.cos(sun.ra.radian-moon.ra.radian))
self.action.args.meta['moon_alt'] = moon_alt
self.action.args.meta['moon_separation'] = moon_separation
self.action.args.meta['moon_illum'] = moon_illum
elif self.action.args.imtype == 'BIAS':
self.log.info('Determine image stats')
mean, med, std = stats.sigma_clipped_stats(self.action.args.ccddata.data)
self.log.info(f" mean, med, std = {mean:.0f}, {med:.0f}, {std:.0f} (adu)")
self.action.args.meta['mean adu'] = mean
self.action.args.meta['median adu'] = med
self.action.args.meta['std dev adu'] = std
elif self.action.args.imtype == 'DARK':
mean, med, std = stats.sigma_clipped_stats(self.action.args.ccddata.data)
self.log.info(f" mean, med, std = {mean:.0f}, {med:.0f}, {std:.0f} (adu)")
self.action.args.meta['mean adu'] = mean
self.action.args.meta['median adu'] = med
self.action.args.meta['std dev adu'] = std
elif self.action.args.imtype in ['DOMEFLAT', 'TWIFLAT']:
mean, med, std = stats.sigma_clipped_stats(self.action.args.ccddata.data)
self.log.info(f" mean, med, std = {mean:.0f}, {med:.0f}, {std:.0f} (adu)")
self.action.args.meta['mean adu'] = mean
self.action.args.meta['median adu'] = med
self.action.args.meta['std dev adu'] = std
return self.action.args
def generate_example_datapack(Nant=10,
Ntime=1,
Ndir=10,
fov=4.,
alt=90.,
az=0.,
time=None,
radio_array=None):
'''Generate a datapack suitable for testing purposes, if time is None then use current time. The dtec is randomly distributed.'''
if radio_array is None:
radio_array = generate_example_radio_array(Nant=Nant)
if time is None:
time = at.Time(strftime("%Y-%m-%dT%H:%M:%S", gmtime()), format='isot')
else:
if isinstance(time, str):
time = at.Time(time, format='isot')
antennas = radio_array.get_antenna_locs()
antenna_labels = radio_array.get_antenna_labels()
Nant = len(antennas)
times = at.Time(np.arange(Ntime) * 8. + time.gps, format='gps')
phase = ac.AltAz(alt=alt * au.deg,
az=az * au.deg,
location=radio_array.get_center(),
obstime=time).transform_to(ac.ICRS)
uvw = UVW(location=radio_array.get_center(), obstime=time, phase=phase)
phi = np.random.uniform(low=-fov / 2., high=fov / 2.,
size=Ndir) * np.pi / 180.
theta = np.random.uniform(low=0, high=360., size=Ndir) * np.pi / 180.
dirs = np.array([
np.cos(theta) * np.sin(phi),
np.sin(theta) * np.sin(phi),
np.cos(phi)
]).T
dirs = ac.SkyCoord(u=dirs[:, 0], v=dirs[:, 1], w=dirs[:, 2],
frame=uvw).transform_to(ac.ICRS)
patch_names = np.array(["facet_patch_{}".format(i) for i in range(Ndir)])
dtec = np.random.normal(size=[Nant, Ntime, Ndir])
data_dict = {
'radio_array': radio_array,
'antennas': antennas,
'antenna_labels': antenna_labels,
'times': times,
'timestamps': times.isot,
'directions': dirs,
'patch_names': patch_names,
'dtec': dtec
}
datapack = DataPack(data_dict=data_dict)
datapack.set_reference_antenna(antenna_labels[0])
return datapack
