def cal2et(date):
"""Convert calendar date to SPICE ephemeris time.
Ephemeris time is seconds past 2000.0.
UTC is assumed.
Parameters
----------
date : string or array
The date.
Returns
-------
et : float or array
Ephemeris time.
"""
from ..util import cal2iso
global _spice_setup
if not _spice_setup:
_setup_spice()
if isinstance(date, (list, tuple, np.ndarray)):
return [cal2et(x) for x in t]
return spice.utc2et(cal2iso(date))
def jd2et(jd):
"""Convert Julian date to SPICE ephemeris time.
Ephemeris time is seconds past 2000.0.
UTC is assumed.
Parameters
----------
jd : string, float, or array
The Julian date. Strings will have higher precisions than
floats.
Returns
-------
et : float or array
Ephemeris time.
"""
global _spice_setup
if not _spice_setup:
_setup_spice()
if isinstance(jd, (list, tuple, np.ndarray)):
return [jd2et(x) for x in jd]
if isinstance(jd, float):
jd = "{:17.9f} JD".format(jd)
return spice.utc2et(jd)
def time2et(t):
"""Convert astropy `Time` to SPICE ephemeris time.
Ephemeris time is seconds past 2000.0.
Parameters
----------
t : astropy Time
The time. Must be convertable to the UTC scale.
Returns
-------
et : float or array
Ephemeris time.
"""
global _spice_setup
from .. import util
if not _spice_setup:
_setup_spice()
if util.date_len(t) > 0:
return [time2et(x) for x in t]
return spice.utc2et(t.utc.iso)
def readone(lin):
### Exception for lines that do not match
try:
### Parse (split on whitespace) three items from line
tims, tems, scids = lin.split()[:3]
### Parse strings: Temp, degC; S/C SPICE ID; ERT UTC to ET(s past J2k)
tem = float(tems)
scid = int(scids)
ert = spice.utc2et(tims)
if spice.failed():
spice.reset()
assert False
### Discard invalid data
### - temperature < 10degC; typically -61.0 = null return
### - SCID neither DII nor DIF
if tem < 10: assert False
if scid != -140 and scid != -70: assert False
### Calculate light time to Earth from S/C to get time at S/C
stateVector, lighttime = spice.spkez(scid, ert, "j2000", "LT", 399)
return ert - lighttime, tem, scid ### success
except:
return [0.0, 0.0, 0] ### failure (SCID==0)
def test_smap(self):
target = 'SMAP'
et0 = spice.utc2et( '2016-06-01T12:00:00' )
dpr = spice.dpr()
a,b,c = [spice.gdpool('BODY399_RADII',i,1)[1] for i in range(3)]
ods = []
for deltatime in [0.1 * i for i in range(1080)]:
et = et0 + deltatime
stSmap,lsSmap = spice.spkezr( target, et, 'IAU_EARTH', 'NONE', 'EARTH' )
posn, veloc = stSmap[:3], stSmap[3:]
stSun,lsSun = spice.spkezr( 'SUN', et0, 'IAU_EARTH', 'LT', 'EARTH' )
mtx = spice.pxform( 'SMAP_REFLECTOR', 'IAU_EARTH', et)
boreEbf = spice.mxv( mtx, [1.0,0,0] )
point = spice.surfpt( posn, boreEbf, a, b, c)
rsurfpt,lon,lat = spice.reclat( point )
utc = spice.et2utc( et, 'ISOC', 3 )
ods += [ OD(deltatime=deltatime,posn=posn,veloc=veloc,boreEbf=boreEbf
,utc=utc,point=point,rsurfpt=rsurfpt
,rsmap=spice.vnorm(posn),lat=lat,lon=lon
,raynge=spice.vnorm(spice.vsub(point,posn))
,sunsep=spice.vsep( spice.ucrss(posn,veloc), stSun[:3] )
)
]
try:
### Moved matplotlib import to here so test runs to here at least
from matplotlib import pyplot as plt
plt.figure(1)
keys = 'lat lon raynge'.split()
secs = [od['deltatime'] for od in ods]
for idx in range(len(keys)):
scal = 1.0 if keys[idx] in 'rsurfpt rsmap raynge sunsep rp ecc t0 mu a P eccmean amean Pmean'.split() else dpr
ordinate = [od[keys[idx]]*scal for od in ods]
plt.subplot( 221+idx )
plt.plot( secs, ordinate )
plt.plot( secs, ordinate, '.')
plt.title( keys[idx] )
plt.ylabel( '%s%s' % (keys[idx],'' if scal==1.0 else ', deg') )
if idx>1: plt.xlabel( 'T-T0, s' )
abscissa = [od['lon']*dpr for od in ods]
ordinate = [od['lat']*dpr for od in ods]
plt.subplot( 221+idx+1 )
plt.title( 'lon vs. lat' )
plt.plot( abscissa, ordinate )
plt.xlabel( 'lon, deg' )
plt.ylabel( 'lat, deg' )
plt.show()
except:
print( "Bypassed, or failed, matplotlib tests" )
def setUp(self):
### Load the kernel
spice.furnsh( __file__ )
### Convert MPC constants to CONICS_C elements
ison = MPC_ISON_C_2012_S1()
self.rpKM = spice.convrt( ison.qAU, 'AU', 'KM')
self.ecc = ison.e
self.incRAD = spice.convrt( ison.InclDEG, 'DEGREES', 'RADIANS')
self.lnodeRAD = spice.convrt( ison.NodeDEG, 'DEGREES', 'RADIANS')
self.argpRAD = spice.convrt( ison.PeriDEG, 'DEGREES', 'RADIANS')
self.m0RAD = spice.convrt( ison.M0, 'DEGREES', 'RADIANS')
self.t0 = spice.str2et( ison.T0_TDT[0] ) + spice.convrt( ison.T0_TDT[1], 'DAYS', 'SECONDS' )
self.mu = ison.MuM3S2 * 1e-9
self.elts = ( self.rpKM, self.ecc, self.incRAD, self.lnodeRAD, self.argpRAD, self.m0RAD, self.t0, self.mu )
self.ditime = spice.utc2et( '2013-01-16 12:00:00' )
def test_example_loading():
currentdir = os.getcwd()
os.chdir(kernelpath)
spice.furnsh("ck/moc42_2010100_2010100_v01.bc")
spice.furnsh("fk/lro_frames_2012255_v02.tf")
spice.furnsh("fk/lro_dlre_frames_2010132_v04.tf")
spice.furnsh("ick/lrodv_2010090_2010121_v01.bc")
spice.furnsh("lsk/naif0010.tls")
spice.furnsh('sclk/lro_clkcor_2010096_v00.tsc')
spice.furnsh("spk/fdf29_2010100_2010101_n01.bsp")
spice.furnsh('./planet_spk/de421.bsp')
utc = dt.strptime('2010100 05', '%Y%j %H').isoformat()
et = spice.utc2et(utc)
t = spice.spkpos('sun', et, 'LRO_DLRE_SCT_REF', 'lt+s', 'lro')
print(t)
answer = ((-63972935.85033857, -55036272.7848299, 123524941.9877458),
499.009424105693)
for i, j in zip(t[0], answer[0]):
assert_equals(round(i, 3), round(j, 3))
os.chdir(currentdir)
def test_example_loading():
currentdir = os.getcwd()
os.chdir(kernelpath)
spice.furnsh("ck/moc42_2010100_2010100_v01.bc")
spice.furnsh("fk/lro_frames_2012255_v02.tf")
spice.furnsh("fk/lro_dlre_frames_2010132_v04.tf")
spice.furnsh("ick/lrodv_2010090_2010121_v01.bc")
spice.furnsh("lsk/naif0010.tls")
spice.furnsh('sclk/lro_clkcor_2010096_v00.tsc')
spice.furnsh("spk/fdf29_2010100_2010101_n01.bsp")
spice.furnsh('./planet_spk/de421.bsp')
utc = dt.strptime('2010100 05', '%Y%j %H').isoformat()
et = spice.utc2et(utc)
t = spice.spkpos('sun', et, 'LRO_DLRE_SCT_REF', 'lt+s', 'lro')
print(t)
answer = ((-63972935.85033857, -55036272.7848299, 123524941.9877458),
499.009424105693)
for i, j in zip(t[0], answer[0]):
assert_equals(round(i, 3), round(j, 3))
os.chdir(currentdir)
import spice
import pprint
spice.furnsh(__file__)
### Get UTC and SCLKs of TOI as strings
utctoi = '2005-07-04T05:44:34.2'
diitoi = '1/0173727875.105'
diftoi = '1/0173727702.218'
### N.B. Old code: pseudo-ET to non-leapsecond-corrected calendar time
###utctoi = spice.etcal( spice.gdpool( 'ETTOIPSEUDO', 0, 1 )[1] )
### Convert UTC and SCLKs strings to ETs
toiet = spice.utc2et( utctoi )
diiet = spice.scs2e( -70, diitoi )
difet = spice.scs2e( -140, diftoi )
### Output __doc__ string
print( __doc__.replace('\b','\\b') )
### Output differences and UTC TOI ET converted to SCLKs
pprint.pprint( ( 'ET differences:'
, ( ('%s(DII)-%s'%(diitoi,utctoi,)) ,diiet-toiet,)
, ( ('%s(DIF)-%s'%(diftoi,utctoi,)) ,difet-toiet,)
, ( ('%s(DIF)-%s(DII)'%(diftoi,diitoi,)),difet-diiet,)
, ''
, 'UTC TOI converted to DII and DIF SCLK:'
, (utctoi+'=>DII', spice.sce2s(-70,toiet),)
, (utctoi+'=>DIF', spice.sce2s(-140,toiet),)
def test_horizons(self):
import horizons
target = 'C/2013 S1'
target = 'C/2011 L4'
spkFilename,spiceId,status = horizons.gomain(target)
spice.furnsh( spkFilename )
self.kernels += [spkFilename]
target_ = '_'.join( target.split() )
et0 = spice.utc2et( '2013-01-10T12:00:00' )
ls2au = spice.convrt( spice.clight(), 'KM', 'AU' )
dpr = spice.dpr()
spd = spice.spd()
deltatime = None
while deltatime is None or abs(deltatime) > 5e-7:
stS2I,lsS2I = spice.spkgeo( spiceId, et0, 'J2000', 10 )
posn, veloc = stS2I[:3], stS2I[3:]
deltatime = - spice.vdot( posn, veloc ) / spice.vdot( veloc, veloc )
et0 += deltatime
valarrs = [ ]
print( (deltatime,spice.et2utc(et0,'ISOC',3),) )
deltatime = 1.0
sixmonths = spice.pi() * 1e7
while deltatime < sixmonths:
for pmdet in (-deltatime,deltatime):
et = et0 + pmdet
utc = spice.et2utc(et,'ISOC',1)
stD2I,lsD2I = spice.spkgeo( spiceId, et, 'J2000', -140)
stI2S,lsI2S = spice.spkgeo( 10, et, 'J2000', spiceId )
stD2S,lsD2S = spice.spkgeo( 10, et, 'J2000', -140 )
rD2I, rI2S = [ ls * ls2au for ls in [lsD2I,lsI2S] ]
aDIS, aSDI = [ ang * dpr for ang in
[ spice.vsep( spice.vminus(stD2I[:3]), stI2S[:-3] )
, spice.vsep( stD2S[:3], stD2I[:-3] )
]
]
valarrs += [ (et,pmdet,rD2I,rI2S,aDIS,aSDI,utc,) ]
deltatime *= 1.2
valarrs.sort()
for valarr in valarrs:
print( '%12.1f %9.3f %9.3f %7.2f %7.2f %s' % valarr[1:] )
days = [i[1]/spd for i in valarrs]
titles = [ i % (target_,) for i in """
Range, %s-DI, AU
Range, %s-Sun, AU
Phase, DI-%s-Sun, deg
Elongation, Sun-DI-%s, deg
""".strip().split('\n')]
try:
### Moved matplotlib import to here so test runs to here at least
from matplotlib import pyplot as plt
plt.figure(1)
for idx in range(len(titles)):
ordinate = [i[idx+2] for i in valarrs]
plt.subplot( 221+idx )
plt.plot( days, ordinate )
plt.plot( days, ordinate, '.')
plt.title( titles[idx] )
plt.ylabel( titles[idx] )
if idx>1: plt.xlabel( 'T-Tperi, d' )
plt.show()
except:
print( "Bypassed, or failed, matplotlib tests" )
def test_horizons(self):
import horizons
target = 'C/2013 S1'
target = 'C/2011 L4'
spkFilename, spiceId, status = horizons.gomain(target)
spice.furnsh(spkFilename)
self.kernels += [spkFilename]
target_ = '_'.join(target.split())
et0 = spice.utc2et('2013-01-10T12:00:00')
ls2au = spice.convrt(spice.clight(), 'KM', 'AU')
dpr = spice.dpr()
spd = spice.spd()
deltatime = None
while deltatime is None or abs(deltatime) > 5e-7:
stS2I, lsS2I = spice.spkgeo(spiceId, et0, 'J2000', 10)
posn, veloc = stS2I[:3], stS2I[3:]
deltatime = -spice.vdot(posn, veloc) / spice.vdot(veloc, veloc)
et0 += deltatime
valarrs = []
print((
deltatime,
spice.et2utc(et0, 'ISOC', 3),
))
deltatime = 1.0
sixmonths = spice.pi() * 1e7
while deltatime < sixmonths:
for pmdet in (-deltatime, deltatime):
et = et0 + pmdet
utc = spice.et2utc(et, 'ISOC', 1)
stD2I, lsD2I = spice.spkgeo(spiceId, et, 'J2000', -140)
stI2S, lsI2S = spice.spkgeo(10, et, 'J2000', spiceId)
stD2S, lsD2S = spice.spkgeo(10, et, 'J2000', -140)
rD2I, rI2S = [ls * ls2au for ls in [lsD2I, lsI2S]]
aDIS, aSDI = [
ang * dpr for ang in [
spice.vsep(spice.vminus(stD2I[:3]), stI2S[:-3]),
spice.vsep(stD2S[:3], stD2I[:-3])
]
]
valarrs += [(
et,
pmdet,
rD2I,
rI2S,
aDIS,
aSDI,
utc,
)]
deltatime *= 1.2
valarrs.sort()
for valarr in valarrs:
print('%12.1f %9.3f %9.3f %7.2f %7.2f %s' % valarr[1:])
days = [i[1] / spd for i in valarrs]
titles = [
i % (target_, ) for i in """
Range, %s-DI, AU
Range, %s-Sun, AU
Phase, DI-%s-Sun, deg
Elongation, Sun-DI-%s, deg
""".strip().split('\n')
]
try:
### Moved matplotlib import to here so test runs to here at least
from matplotlib import pyplot as plt
plt.figure(1)
for idx in range(len(titles)):
ordinate = [i[idx + 2] for i in valarrs]
plt.subplot(221 + idx)
plt.plot(days, ordinate)
plt.plot(days, ordinate, '.')
plt.title(titles[idx])
plt.ylabel(titles[idx])
if idx > 1: plt.xlabel('T-Tperi, d')
plt.show()
except:
print("Bypassed, or failed, matplotlib tests")
currentdir = os.getcwd()
os.chdir(kernelpath)
spice.furnsh("fk/lro_frames_2012255_v02.tf")
spice.furnsh("fk/lro_dlre_frames_2010132_v04.tf")
spice.furnsh("ick/lrodv_2010090_2010121_v01.bc")
spice.furnsh("lsk/naif0010.tls")
spice.furnsh('sclk/lro_clkcor_2009182_v00.tsc')
spice.furnsh("spk/fdf29_2010100_2010101_n01.bsp")
spice.furnsh('./planet_spk/de421.bsp')
# spice.furnsh("ck/moc42_2010100_2010100_v01.bc")
time = dt(2009,6,24,0,1,8)
print("Testing for time ", time, '\nIn kernel-time: ', time.strftime("%Y%j"),
'plus {0} hours.'.format(time.hour))
et = spice.utc2et(time.isoformat())
# ckernels = ['moc42_2010100_2010100_v01.bc', 'moc42_2010100_2010101_v01.bc',
# 'moc42_2010100_2010101_v02.bc']
ckernels = ['moc42_2009174_2009175_v01.bc','moc42_2009175_2009176_v02.bc']
for ck in ckernels:
spice.furnsh('ck/'+ck)
print("Loading {0}".format(ck))
t = spice.spkpos('sun', et, 'LRO_DLRE_SCT_REF', 'lt+s', 'lro')
unitv = spice.vhat(t[0])
print(t[0], "Zenith angle:", degrees(arccos(unitv[2])))
spice.unload('ck/'+ck)
pdsi = PDSImage.PDSImage()
### dcmd ocontains recursive dictionaries
dcmd = pdsi._downone(faux)
### Extract start time from dcmd (CoreMetadata) as ISO UTC string
firstTomsUTC = '%sT%s' % (
dcmd['INVENTORYMETADATA']['RANGEDATETIME']['RANGEBEGINNINGDATE']
['VALUE'],
dcmd['INVENTORYMETADATA']['RANGEDATETIME']['RANGEBEGINNINGTIME']
['VALUE'],
)
### Combine start time and /Time offset to get the TOMS data zero epoch as seconds past J2000 epoch
### N.B. is typically (always?) equivalent to 1993-01-01T00:00:00 UTC
tomsZeroEpoch = spice.utc2et(firstTomsUTC) - tomsOffsetTimes[0]
print('%s(Epoch) %s(Start) %s' % (
spice.et2utc(tomsZeroEpoch, 'ISOC', 1),
firstTomsUTC,
fnInput,
))
### Iterators
twoDshape = surfLonDegs.shape
rowIter, pixelIter = map(xrange, twoDshape)
glintAngles = numpy.zeros(twoDshape, dtype=numpy.float32)
for row in rowIter:
def test_smap(self):
target = 'SMAP'
et0 = spice.utc2et('2016-06-01T12:00:00')
dpr = spice.dpr()
a, b, c = [spice.gdpool('BODY399_RADII', i, 1)[1] for i in range(3)]
ods = []
for deltatime in [0.1 * i for i in range(1080)]:
et = et0 + deltatime
stSmap, lsSmap = spice.spkezr(target, et, 'IAU_EARTH', 'NONE',
'EARTH')
posn, veloc = stSmap[:3], stSmap[3:]
stSun, lsSun = spice.spkezr('SUN', et0, 'IAU_EARTH', 'LT', 'EARTH')
mtx = spice.pxform('SMAP_REFLECTOR', 'IAU_EARTH', et)
boreEbf = spice.mxv(mtx, [1.0, 0, 0])
point = spice.surfpt(posn, boreEbf, a, b, c)
rsurfpt, lon, lat = spice.reclat(point)
utc = spice.et2utc(et, 'ISOC', 3)
ods += [
OD(deltatime=deltatime,
posn=posn,
veloc=veloc,
boreEbf=boreEbf,
utc=utc,
point=point,
rsurfpt=rsurfpt,
rsmap=spice.vnorm(posn),
lat=lat,
lon=lon,
raynge=spice.vnorm(spice.vsub(point, posn)),
sunsep=spice.vsep(spice.ucrss(posn, veloc), stSun[:3]))
]
try:
### Moved matplotlib import to here so test runs to here at least
from matplotlib import pyplot as plt
plt.figure(1)
keys = 'lat lon raynge'.split()
secs = [od['deltatime'] for od in ods]
for idx in range(len(keys)):
scal = 1.0 if keys[
idx] in 'rsurfpt rsmap raynge sunsep rp ecc t0 mu a P eccmean amean Pmean'.split(
) else dpr
ordinate = [od[keys[idx]] * scal for od in ods]
plt.subplot(221 + idx)
plt.plot(secs, ordinate)
plt.plot(secs, ordinate, '.')
plt.title(keys[idx])
plt.ylabel('%s%s' %
(keys[idx], '' if scal == 1.0 else ', deg'))
if idx > 1: plt.xlabel('T-T0, s')
abscissa = [od['lon'] * dpr for od in ods]
ordinate = [od['lat'] * dpr for od in ods]
plt.subplot(221 + idx + 1)
plt.title('lon vs. lat')
plt.plot(abscissa, ordinate)
plt.xlabel('lon, deg')
plt.ylabel('lat, deg')
plt.show()
except:
print("Bypassed, or failed, matplotlib tests")
import spice
import pprint
spice.furnsh(__file__)
### Get UTC and SCLKs of TOI as strings
utctoi = '2005-07-04T05:44:34.2'
diitoi = '1/0173727875.105'
diftoi = '1/0173727702.218'
### N.B. Old code: pseudo-ET to non-leapsecond-corrected calendar time
###utctoi = spice.etcal( spice.gdpool( 'ETTOIPSEUDO', 0, 1 )[1] )
### Convert UTC and SCLKs strings to ETs
toiet = spice.utc2et(utctoi)
diiet = spice.scs2e(-70, diitoi)
difet = spice.scs2e(-140, diftoi)
### Output __doc__ string
print(__doc__.replace('\b', '\\b'))
### Output differences and UTC TOI ET converted to SCLKs
pprint.pprint((
'ET differences:',
(
('%s(DII)-%s' % (
diitoi,
utctoi,
)),
diiet - toiet,
