def test_update_iers(self):
"""Test updating the IERS table. Requires a network connection."""
save_name = os.path.join(self.tmpdir, 'iers.ecsv')
utils.update_iers(save_name)
# Second write should overwrite original file.
utils.update_iers(save_name)
utils.freeze_iers(save_name)
def dateobs2night(dateobs):
'''
Convert UTC dateobs to KPNO YEARMMDD night string
Args:
dateobs:
float -> interpret as MJD
str -> interpret as ISO 8601 YEAR-MM-DDThh:mm:ss.s string
astropy.time.Time -> UTC
python datetime.datetime -> UTC
TODO: consider adding format option to pass to astropy.time.Time without
otherwise questioning the dateobs format
'''
# See pixsim.py
from desisurvey.utils import freeze_iers
freeze_iers()
import astropy.time
import datetime
if isinstance(dateobs, float):
dateobs = astropy.time.Time(dateobs, format='mjd')
elif isinstance(dateobs, datetime.datetime):
dateobs = astropy.time.Time(dateobs, format='datetime')
elif isinstance(dateobs, str):
dateobs = astropy.time.Time(dateobs, format='isot')
elif not isinstance(dateobs, astropy.time.Time):
raise ValueError(
'dateobs must be float, str, datetime, or astropy time object')
import astropy.units as u
kpno_time = dateobs - 7 * u.hour
#- "night" rolls over at local noon, not midnight, so subtract another 12 hours
yearmmdd = (kpno_time - 12 * u.hour).isot[0:10].replace('-', '')
assert len(yearmmdd) == 8
return yearmmdd
import desimodel.io
import desispec.io
from desispec.image import Image
import desispec.cosmics
from . import obs, io
from desiutil.log import get_logger
log = get_logger()
# Inhibit download of IERS-A catalog, even from a good server.
# Note that this is triggered by a call to astropy.time.Time(),
# which is subsequently used to compute sidereal_time().
# It's the initialization of astropy.time.Time() itself that makes the call.
from desisurvey.utils import freeze_iers
freeze_iers()
from astropy.time import Time
def simulate_exposure(simspecfile, rawfile, cameras=None,
ccdshape=None, simpixfile=None, addcosmics=None, comm=None,
**kwargs):
"""
Simulate frames from an exposure, including I/O
Args:
simspecfile: input simspec format file with spectra
rawfile: output raw data file to write
Options:
cameras: str or list of str, e.g. b0, r1, .. z9
ccdshape: (npix_y, npix_x) primarily used to limit memory while testing
def test_freeze_iers_bad_format(self):
"""Test freezing from valid file with wrong format"""
with self.assertRaises(ValueError):
utils.freeze_iers('config.yaml')
def test_freeze_iers_bad_name(self):
"""Test freezing from package data/"""
with self.assertRaises(ValueError):
utils.freeze_iers('_non_existent_.ecsv')
def test_freeze_iers(self):
"""Test freezing from package data/"""
utils.freeze_iers()
future = astropy.time.Time('2024-01-01', location=utils.get_location())
lst = future.sidereal_time('apparent')