def spacecraft_direction(self):
"""
Returns the x axis of the first velocity vector relative to the
spacecraft. This indicates of the craft is moving forwards or backwards.
From LROC Frame Kernel: lro_frames_2014049_v01.tf
"+X axis is in the direction of the velocity vector half the year. The
other half of the year, the +X axis is opposite the velocity vector"
Hence we rotate the first velocity vector into the sensor reference
frame, but the X component of that vector is inverted compared to the
spacecraft so a +X indicates backwards and -X indicates forwards
The returned velocity is also slightly off from the spacecraft velocity
due to the sensor being attached to the craft with wax.
Returns
-------
direction : double
X value of the first velocity relative to the sensor
"""
frame_chain = self.frame_chain
lro_bus_id = spice.bods2c('LRO_SC_BUS')
time = self.ephemeris_start_time
state, _ = spice.spkezr(self.spacecraft_name, time, 'J2000', 'None',
self.target_name)
position = state[:3]
velocity = state[3:]
rotation = frame_chain.compute_rotation(1, lro_bus_id)
rotated_velocity = spice.mxv(rotation._rots.as_matrix()[0], velocity)
return rotated_velocity[0]
def ikid(self):
"""
Returns
-------
: int
Naif ID used to for indentifying the instrument in Spice kernels
"""
return spice.bods2c(self.instrument_id)
def _tc_id(self):
"""
Returns ikid of LISM_TC1 or LISM_TC2, depending which camera was used
for capturing the image.
Some keys are stored in the IK kernel under a general ikid for TC1/TC2
presumably because they are not affected by the addtional parameters encoded in
the ikid returned by self.ikid. This method exists for those gdpool calls.
"""
return spice.bods2c("LISM_{}".format(super().instrument_id))
def ikid(self):
"""
Returns the Naif ID code for HRSC SRC.
Returns
-------
: int
Naif ID used to for indentifying the instrument in Spice kernels
"""
return spice.bods2c("MEX_HRSC_SRC")
def ikid(self):
"""
Returns the Naif ID code for the HRSC head instrument
This would be the Naif ID code for the base (or "head") instrument.
Returns
-------
: int
Naif ID used to for indentifying the instrument in Spice kernels
"""
return spice.bods2c("MEX_HRSC_HEAD")
def utc2scs_spice(tais, sc):
res = {}
try:
scid = sp.bods2c(sc)
for tai in tais:
et = sp.unitim(tai, 'tai', 'et')
obt = sp.sce2s(scid, et)
utc = sp.et2utc(et, 'isoc', 3)
res[utc] = obt
except sp.stypes.SpiceyError as ex:
raise GeometrySpiceError(ex.value)
else:
return res
def state_internal(func_spice, utc, utc_end, deltat, kind, observer, target, ref, abcorr):
try:
tgt = sp.bods2c(target)
obs = sp.bods2c(observer)
except sp.stypes.SpiceyError as ex:
raise GeometrySpiceError(ex.value)
if abcorr is None:
abcorr = 'NONE'
if kind is not None:
kind = kind.lower()
try:
xfunc = _POSITION_KIND[kind]
except KeyError:
raise ValidationError(kind)
kwargs = {'observer': obs,
'target': tgt,
'ref': ref,
'abcorr': abcorr}
tais = utc2tai(utc, utc_end, deltat)
return wrap_result(distribute_work(func_spice, xfunc, tais, **kwargs))
def fikid(self):
"""
Naif ID code of the filter dependent instrument codes.
Expects filter_number to be defined. This should be an integer containing
the filter number from the pds3 label.
Expects ikid to be defined. This should be the integer Naid ID code for
the instrument.
Returns
-------
: int
Naif ID code used in calculating focal length
"""
return spice.bods2c(self.instrument_id)
def __init__(self, obj, kernel=None):
State.__init__(self, name=obj)
if not core._spice_setup:
core._setup_spice()
if kernel is None:
kernel = core.find_kernel(obj)
core.load_kernel(kernel)
self.kernel = kernel
if isinstance(obj, int):
obj = str(obj)
naifid = spice.bods2c(obj)
self.obj = obj
self.naifid = naifid
def scs2utc_spice(scs, sc, deltat):
res = {}
try:
scid = sp.bods2c(sc)
et = sp.scs2e(scid, scs)
if deltat is not None:
tai = sp.unitim(et, 'et', 'tai')
tai += deltat
et = sp.unitim(tai, 'tai', 'et')
utc = sp.et2utc(et, 'isoc', 3)
res[scs] = utc
except sp.stypes.SpiceyError as ex:
raise GeometrySpiceError(ex.value)
else:
return res
def _tc_id(self):
"""
Returns ikid of LISM_TC1 or LISM_TC2, depending which camera was used
for capturing the image.
Some keys are stored in the IK kernel under a general ikid for TC1/TC2
presumably because they are not affected by the addtional parameters encoded in
the ikid returned by self.ikid. This method exists for those gdpool calls.
Expects instrument_id to be defined in the Pds3Label mixin. This should be
a string containing either TC1 or TC2
Returns
-------
: int
ikid of LISM_TC1 or LISM_TC2
"""
return spice.bods2c("LISM_{}".format(super().instrument_id))
def target_id(self):
return spice.bods2c(self.target_name)
def spacecraft_id(self):
return spice.bods2c(self.spacecraft_name)
all_boresight_vectors, all_boresight_names = readBoresightFile(BORESIGHT_VECTOR_FILE_PATH)
for fileName, realBoresightUsed in fileNames_in.items():
hdf5file_path = os.path.join(
r"C:\Users\iant\Documents\DATA\hdf5_copy\hdf5_level_0p3a",
fileName[0:4], fileName[4:6], fileName[6:8],
fileName+".h5")
hdf5FileIn = h5py.File(hdf5file_path, "r")
observationDTimes = hdf5FileIn["Geometry/ObservationDateTime"][...]
dref = "TGO_NOMAD_SO"
channelId = sp.bods2c(dref) #find channel id number
[channelShape, name, boresightVector, nvectors, boresightVectorbounds] = sp.getfov(channelId, 4)
SPICE_REFERENCE_FRAME = "TGO_SPACECRAFT"
SPICE_ABERRATION_CORRECTION = "None"
SPICE_OBSERVER = "-143"
observationDTimesStart = [str(observationDTime[0]) for observationDTime in observationDTimes]
observationDTimesEnd = [str(observationDTime[1]) for observationDTime in observationDTimes]
obsTimesStart = [sp.utc2et(datetime.strip("<b>").strip("'")) for datetime in observationDTimesStart]
obsTimesEnd = [sp.utc2et(datetime.strip("<b>").strip("'")) for datetime in observationDTimesEnd]
#find times in occultation
obsTimeMids = [obsTimesStart[0], np.mean([obsTimesStart[0],obsTimesStart[-1]]), obsTimesStart[-1]]
def get_isd(label):
mission_name = {"CASSINI-HUYGENS": "CASSINI"}
instrument_names = {"ISSNA": "CASSINI_ISS_NAC", "ISSWA": "CASSINI_ISS_WAC"}
metakernal_dir = config.cassini
mks = sorted(glob(metakernal_dir + '/*.tm'))
instrument_name = instrument_names[label['INSTRUMENT_ID']]
spacecraft_name = mission_name[label['MISSION_NAME']]
target_name = label['TARGET_NAME']
time = label['START_TIME']
cassini_mk = None
for mk in mks:
if str(time.year) in os.path.basename(mk):
cassini_mk = mk
spice.furnsh(cassini_mk)
# Spice likes ids over names, so grab the ids from the names
spacecraft_id = spice.bods2c(spacecraft_name)
instrument_id = spice.bods2c(instrument_name)
# Load the instrument and target metadata into the ISD
reference_frame = 'IAU_{}'.format(target_name)
isd = {}
rad = spice.bodvrd(target_name, 'RADII', 3)
isd['semimajor'] = rad[1][0] * 1000
isd['semiminor'] = rad[1][1] * 1000
# transx and transy are unavailable so fill in with pixel_size after conversion to millimeters from microns
# assuming pixels are square
pixel_size = int(
spice.gipool('INS{}_PIXEL_SIZE'.format(instrument_id), 0,
1)[0]) * 0.001
isd['focal2pixel_samples'] = [0.0, pixel_size, 0.0]
isd['focal2pixel_lines'] = [0.0, 0.0, pixel_size]
# unavailable so default to 0
isd['starting_detector_sample'] = 0.0
isd['starting_detector_line'] = 0.0
isd['image_lines'] = float(
spice.gipool('INS{}_PIXEL_LINES'.format(instrument_id), 0, 1)[0])
isd['image_samples'] = float(
spice.gipool('INS{}_PIXEL_SAMPLES'.format(instrument_id), 0, 1)[0])
isd['focal_length_model'] = {}
isd['focal_length_model']['focal_length'] = float(
spice.gdpool('INS{}_FOCAL_LENGTH'.format(instrument_id), 0, 1)[0])
isd['focal_length_model']['focal_length_epsilon'] = float(
spice.gdpool('INS{}_FL_UNCERTAINTY'.format(instrument_id), 0, 1)[0])
# this following part is ripped from the mdis driver. Since they are both framers this code should be able to be applied to both
# Now time
sclock = label['SPACECRAFT_CLOCK_START_COUNT']
exposure_duration = label['EXPOSURE_DURATION'].value
exposure_duration = exposure_duration * 0.001 # Scale to seconds
# Get the instrument id, and, since this is a framer, set the time to the middle of the exposure
start_et = spice.scs2e(spacecraft_id, sclock)
start_et += (exposure_duration / 2.0)
end_et = spice.scs2e(
spacecraft_id,
label['SPACECRAFT_CLOCK_STOP_COUNT']) + (exposure_duration / 2.0)
del_et = end_et - start_et
et = (start_et + end_et) / 2
isd['starting_ephemeris_time'] = start_et
isd['dt_ephemeris'] = del_et
isd['number_of_ephemerides'] = 1
isd['interpolation_method'] = 'lagrange'
isd['center_ephemeris_time'] = et
# Get the rotation angles from MDIS NAC frame to Mercury body-fixed frame
camera2bodyfixed = spice.pxform(instrument_name, reference_frame, et)
quat = spice.m2q(camera2bodyfixed)
# cassini follows spice style for quaternions so no transformation is needed
isd['sensor_orientation'] = list(quat)
# Get the Sensor Position
loc, _ = spice.spkpos(target_name, et, reference_frame, 'None',
spacecraft_name)
loc *= -1000
isd['sensor_location'] = {}
isd['sensor_location']['x'] = loc[0]
isd['sensor_location']['y'] = loc[1]
isd['sensor_location']['z'] = loc[2]
isd['sensor_location']['unit'] = 'm'
# Get the velocity
v_state, lt = spice.spkezr(spacecraft_name, et, reference_frame, 'NONE',
target_name)
isd['sensor_velocity'] = {}
isd['sensor_velocity']['x'] = v_state[3] * 1000
isd['sensor_velocity']['y'] = v_state[4] * 1000
isd['sensor_velocity']['z'] = v_state[5] * 1000
isd['sensor_velocity']['unit'] = 'm'
isd['reference_height'] = {}
isd['reference_height']['minheight'] = label.get('min_valid_height', -8000)
isd['reference_height']['maxheight'] = label.get('max_valid_height', 8000)
isd['reference_height']['unit'] = 'KM'
# Get the sun position
sun_state, lt = spice.spkezr("SUN", et, reference_frame, 'NONE',
target_name)
# lighttime should always be off
isd['sun_position'] = {}
isd['sun_position']['x'] = sun_state[0] * 1000
isd['sun_position']['y'] = sun_state[1] * 1000
isd['sun_position']['z'] = sun_state[2] * 1000
isd['sun_velocity'] = {}
isd['sun_velocity']['x'] = sun_state[3] * 1000
isd['sun_velocity']['y'] = sun_state[4] * 1000
isd['sun_velocity']['z'] = sun_state[5] * 1000
# cassini has no optical distortion model
isd['optical_distortion'] = None
return isd
def get_isd(label):
metakernel_dir = config.mro
mks = sorted(glob(os.path.join(config.mro, '*.tm')))
time = label['START_TIME']
mro_mk = None
for mk in mks:
if str(time.year) in os.path.basename(mk):
mro_mk = mk
spice.furnsh(mro_mk)
isd = {}
instrument_name = label['INSTRUMENT_NAME']
spacecraft_name = label['SPACECRAFT_NAME']
target_name = label['TARGET_NAME']
# Spice likes ids over names, so grab the ids from the names
spacecraft_id = spice.bods2c(
'MRO') # Label specifies: MARS_RECONNAISSANCE_ORBITER
ikid = spice.bods2c('MRO_CTX') # Label specifies: CONTEXT CAMERA
# Load the instrument and target metadata into the ISD
reference_frame = 'IAU_{}'.format(target_name)
# Instrument / Spacecraft Metadata
isd['OPTICAL_DIST_COEF'] = [
0, 0, 0
] # spice.gdpool('INS{}_OD_K'.format(ikid),0, 3)
isd['ITRANSL'] = spice.gdpool('INS{}_ITRANSL'.format(ikid), 0, 3)
isd['ITRANSS'] = spice.gdpool('INS{}_ITRANSS'.format(ikid), 0, 3)
isd['DETECTOR_SAMPLE_ORIGIN'] = spice.gdpool(
'INS{}_BORESIGHT_SAMPLE'.format(ikid), 0, 1)
isd['DETECTOR_LINE_ORIGIN'] = spice.gdpool(
'INS{}_BORESIGHT_LINE'.format(ikid), 0, 1)
isd['DETECTOR_SAMPLE_SUMMING'] = label['SAMPLING_FACTOR']
isd['STARTING_SAMPLE'] = 0 # label['SAMPLE_FIRST_PIXEL']
isd['TOTAL_LINES'] = nlines = label['IMAGE']['LINES']
isd['TOTAL_SAMPLES'] = label['IMAGE'][
'LINE_SAMPLES'] # spice.gdpool('INS{}_PIXEL_SAMPLES'.format(ikid), 0, 1)
isd['SENSOR_TYPE'] = 'USGSAstroLineScanner'
isd['MOUNTING_ANGLES'] = np.zeros(3)
isd['ISIS_Z_DIRECTION'] = 1
isd['STARTING_LINE'] = 1.0
isd['DETECTOR_LINE_OFFSET'] = 0.0
# Body Parameters
target_name = label['TARGET_NAME']
rad = spice.bodvrd(target_name, 'RADII', 3)
a = rad[1][1]
b = rad[1][2]
isd['SEMI_MAJOR_AXIS'] = a * 1000 # Scale to meters
isd['ECCENTRICITY'] = np.sqrt(1 - (b**2 / a**2)) # Standard eccentricity
isd['FOCAL'] = spice.gdpool('INS{}_FOCAL_LENGTH'.format(ikid), 0, 1)
isd['ABERR'] = 0
isd['ATMREF'] = 0
isd['PLATFORM'] = 1
# It really is hard coded this way...
isd['TRI_PARAMETERS'] = np.zeros(18)
isd['TRI_PARAMETERS'][15] = isd['FOCAL']
# Time
sclock = label['SPACECRAFT_CLOCK_START_COUNT']
et = spice.scs2e(spacecraft_id, sclock)
isd['STARTING_EPHEMERIS_TIME'] = et
half_lines = nlines / 2
isd['INT_TIME'] = line_rate = label['LINE_EXPOSURE_DURATION'][
0] * 0.001 # Scale to seconds
center_sclock = et + half_lines * line_rate
isd['CENTER_EPHEMERIS_TIME'] = center_sclock
isd['SCAN_DURATION'] = line_rate * nlines
# The socetlinekeywords code is pushing ephemeris and quaternion off of either side of the image. Therefore,
# the code needs to know when the start time is. Since we are not pushing off the edge of the image, the start-time
# should be identical to the actual image start time.
isd['T0_QUAT'] = isd['T0_EPHEM'] = isd['STARTING_EPHEMERIS_TIME'] - isd[
'CENTER_EPHEMERIS_TIME']
isd['DT_EPHEM'] = 80 * isd['INT_TIME'] # This is every 300 lines
# Determine how many ephemeris points to compute
n_ephemeris = int(isd['SCAN_DURATION'] / isd['DT_EPHEM'])
if n_ephemeris % 2 == 0:
n_ephemeris += 1
isd['NUMBER_OF_EPHEM'] = n_ephemeris
eph = np.empty((n_ephemeris, 3))
eph_rates = np.empty(eph.shape)
current_et = et
for i in range(n_ephemeris):
loc_direct, _ = spice.spkpos(target_name, current_et, 'IAU_MARS',
'NONE', 'MRO')
state, _ = spice.spkezr(target_name, current_et, 'IAU_MARS', 'NONE',
'MRO')
eph[i] = loc_direct
eph_rates[i] = state[3:]
current_et += isd[
'DT_EPHEM'] # Increment the time by the number of lines being stepped
eph *= -1000 # Reverse to be from body center and convert to meters
eph_rates *= -1000 # Same, reverse and convert
isd['EPHEM_PTS'] = eph.flatten()
isd['EPHEM_RATES'] = eph_rates.flatten()
# Why should / should not the n_quaternions equal the number of ephemeris pts?
n_quaternions = n_ephemeris
isd['NUMBER_OF_QUATERNIONS'] = n_quaternions
isd['DT_QUAT'] = isd['SCAN_DURATION'] / n_quaternions
qua = np.empty((n_quaternions, 4))
current_et = et
for i in range(n_quaternions):
# Find the rotation matrix
camera2bodyfixed = spice.pxform('MRO_CTX', 'IAU_MARS', current_et)
q = spice.m2q(camera2bodyfixed)
qua[i, :3] = q[1:]
qua[i, 3] = q[0]
current_et += isd['DT_QUAT']
isd['QUATERNIONS'] = qua.flatten()
# Now the 'optional' stuff
isd['REFERENCE_HEIGHT'] = label.get('reference_height', 30)
isd['MIN_VALID_HT'] = label.get('min_valid_height', -8000)
isd['MAX_VALID_HT'] = label.get('max_valid_height', 8000)
isd['IMAGE_ID'] = label.get('image_id', 'UNKNOWN')
isd['SENSOR_ID'] = label.get('sensor_id', 'USGS_LINE_SCANNER')
isd['PLATFORM_ID'] = label.get('platform_id', 'UNKNOWN')
isd['TRAJ_ID'] = label.get('traj_id', 'UNKNOWN')
isd['COLL_ID'] = label.get('coll_id', 'UNKNOWN')
isd['REF_DATE_TIME'] = label.get('ref_date_time', 'UNKNOWN')
spice.unload(mro_mk)
return isd
def ikid(self):
return spice.bods2c(self.instrument_id)
def ctx_isd_from_json(data, meta):
time = parser.parse(data['START_TIME'])
for k in meta:
if k.year.year == time.year:
obs_kernels = k.path
# Load the meta kernel
spice.furnsh(obs_kernels)
isd = {}
spacecraft_name = data['SPACECRAFT_NAME']
spacecraft_id = spice.bods2c('MRO')
# Need to map CONTEXT CAMERA to what spice wants - MRO_CTX
instrument_name = data['INSTRUMENT_NAME']
ikid = isd['IKCODE'] = spice.bods2c('MRO_CTX')
# Instrument / Spacecraft Metadata
isd['OPTICAL_DIST_COEF'] = spice.gdpool('INS{}_OD_K'.format(ikid), 0, 3)
isd['ITRANSL'] = spice.gdpool('INS{}_ITRANSL'.format(ikid), 0, 3)
isd['ITRANSS'] = spice.gdpool('INS{}_ITRANSS'.format(ikid), 0, 3)
isd['DETECTOR_SAMPLE_ORIGIN'] = spice.gdpool(
'INS{}_BORESIGHT_SAMPLE'.format(ikid), 0, 1)
isd['DETECTOR_LINE_ORIGIN'] = spice.gdpool(
'INS{}_BORESIGHT_LINE'.format(ikid), 0, 1)
isd['DETECTOR_SAMPLE_SUMMING'] = data['SAMPLING_FACTOR']
isd['DETECTOR_SAMPLE_SUMMING'] = data['SAMPLING_FACTOR']
isd['STARTING_SAMPLE'] = data['SAMPLE_FIRST_PIXEL']
isd['TOTAL_LINES'] = nlines = data['IMAGE']['LINES']
isd['TOTAL_SAMPLES'] = spice.gdpool('INS{}_PIXEL_SAMPLES'.format(ikid), 0,
1)
isd['SENSOR_TYPE'] = 'USGSAstroLineScanner'
isd['MOUNTING_ANGLES'] = np.zeros(3)
isd['ISIS_Z_DIRECTION'] = 1
isd['STARTING_LINE'] = 1.0
isd['DETECTOR_LINE_OFFSET'] = 0.0
# Body Parameters
target_name = find_in_dict(data, 'TARGET_NAME')
rad = spice.bodvrd(target_name, 'RADII', 3)
a = rad[1][1]
b = rad[1][2]
isd['SEMI_MAJOR_AXIS'] = a * 1000 # Scale to meters
isd['ECCENTRICITY'] = sqrt(1 - (b**2 / a**2)) # Standard eccentricity
isd['FOCAL'] = spice.gdpool('INS{}_FOCAL_LENGTH'.format(ikid), 0, 1)
isd['ABERR'] = 0
isd['ATMREF'] = 0
isd['PLATFORM'] = 1
# It really is hard coded this way...
isd['TRI_PARAMETERS'] = np.zeros(18)
isd['TRI_PARAMETERS'][15] = isd['FOCAL']
# Time
sclock = find_in_dict(data, 'SPACECRAFT_CLOCK_START_COUNT')
et = spice.scs2e(spacecraft_id, sclock)
isd['STARTING_EPHEMERIS_TIME'] = et
half_lines = nlines / 2
isd['INT_TIME'] = line_rate = data['LINE_EXPOSURE_DURATION'][
0] * 0.001 # Scale to seconds
center_sclock = et + half_lines * line_rate
isd['CENTER_EPHEMERIS_TIME'] = center_sclock
isd['SCAN_DURATION'] = line_rate * nlines
# The socetlinekeywords code is pushing ephemeris and quaternion off of either side of the image. Therefore,
# the code needs to know when the start time is. Since we are not pushing off the edge of the image, the start-time
# should be identical to the actual image start time.
isd['T0_QUAT'] = isd['T0_EPHEM'] = isd['STARTING_EPHEMERIS_TIME'] - isd[
'CENTER_EPHEMERIS_TIME']
isd['DT_EPHEM'] = 80 * isd['INT_TIME'] # This is every 300 lines
# Determine how many ephemeris points to compute
n_ephemeris = int(isd['SCAN_DURATION'] / isd['DT_EPHEM'])
if n_ephemeris % 2 == 0:
n_ephemeris += 1
isd['NUMBER_OF_EPHEM'] = n_ephemeris
eph = np.empty((n_ephemeris, 3))
eph_rates = np.empty(eph.shape)
current_et = et
for i in range(n_ephemeris):
loc_direct, _ = spice.spkpos(target_name, current_et, 'IAU_MARS',
'LT+S', 'MRO')
state, _ = spice.spkezr(target_name, current_et, 'IAU_MARS', 'LT+S',
'MRO')
eph[i] = loc_direct
eph_rates[i] = state[3:]
current_et += isd[
'DT_EPHEM'] # Increment the time by the number of lines being stepped
eph *= -1000 # Reverse to be from body center and convert to meters
eph_rates *= -1000 # Same, reverse and convert
isd['EPHEM_PTS'] = eph.flatten()
isd['EPHEM_RATES'] = eph_rates.flatten()
# Why should / should not the n_quaternions equal the number of ephemeris pts?
n_quaternions = n_ephemeris
isd['NUMBER_OF_QUATERNIONS'] = n_quaternions
isd['DT_QUAT'] = isd['SCAN_DURATION'] / n_quaternions
qua = np.empty((n_quaternions, 4))
current_et = et
for i in range(n_quaternions):
# Find the rotation matrix
camera2bodyfixed = spice.pxform('MRO_CTX', 'IAU_MARS', current_et)
q = spice.m2q(camera2bodyfixed)
qua[i][:3] = q[1:]
qua[i][-1] = q[0]
current_et += isd['DT_QUAT']
isd['QUATERNIONS'] = qua.flatten()
# Now the 'optional' stuff
isd['REFERENCE_HEIGHT'] = data.get('reference_height', 30)
isd['MIN_VALID_HT'] = data.get('min_valid_height', -8000)
isd['MAX_VALID_HT'] = data.get('max_valid_height', 8000)
isd['IMAGE_ID'] = data.get('image_id', 'UNKNOWN')
isd['SENSOR_ID'] = data.get('sensor_id', 'USGS_LINE_SCANNER')
isd['PLATFORM_ID'] = data.get('platform_id', 'UNKNOWN')
isd['TRAJ_ID'] = data.get('traj_id', 'UNKNOWN')
isd['COLL_ID'] = data.get('coll_id', 'UNKNOWN')
isd['REF_DATE_TIME'] = data.get('ref_date_time', 'UNKNOWN')
spice.unload(obs_kernels)
return json.dumps(isd, cls=NumpyEncoder)
def body_code(self):
'''Spice body code'''
return spice.bods2c(self.targ)
def isd_from_json(data, meta):
instrument_name = {
'IMAGING SCIENCE SUBSYSTEM NARROW ANGLE': 'CASSINI_ISS_NAC',
'IMAGING SCIENCE SUBSYSTEM WIDE ANGLE': 'CASSINI_ISS_WAC',
'IMAGING SCIENCE SUBSYSTEM - NARROW ANGLE': 'CASSINI_ISS_NAC',
'MDIS-NAC': 'MSGR_MDIS_NAC',
'MERCURY DUAL IMAGING SYSTEM NARROW ANGLE CAMERA': 'MSGR_MDIS_NAC',
'MERCURY DUAL IMAGING SYSTEM WIDE ANGLE CAMERA': 'MSGR_MDIS_WAC'
}
spacecraft_names = {'CASSINI ORBITER': 'CASSINI', 'MESSENGER': 'MESSENGER'}
# This is the return dict
isd = {}
# Meta kernels are keyed by body, spacecraft, and year - grab from the data
spacecraft_name = spacecraft_names[data['spacecraft_id']]
target_name = data['target_name']
time = parser.parse(data['capture_date'])
for k in meta:
if k.year.year == time.year:
obs_kernels = k.path
# Load the meta kernel
spice.furnsh(obs_kernels)
path, tpe, handle, found = spice.kdata(0, 'TEXT')
if not found:
directory = os.path.dirname(path)
directory = os.path.abspath(os.path.join(directory, '../iak'))
additional_ik = glob.glob(directory + '/*.ti')
spice.furnsh(additional_ik)
# Spice likes ids over names, so grab the ids from the names
instrument_name = instrument_name[data['instrument']]
spacecraft_id = spice.bods2c(spacecraft_name)
ikid = spice.bods2c(instrument_name)
# Load the instrument and target metadata into the ISD
isd['instrument_id'] = instrument_name
isd['target_name'] = target_name
isd['spacecraft_name'] = spacecraft_name
# Prepend IAU to all instances of the body name
reference_frame = 'IAU_{}'.format(target_name)
# Load information from the IK kernel
isd['focal_length'] = spice.gdpool('INS{}_FOCAL_LENGTH'.format(ikid), 0, 1)
isd['focal_length_epsilon'] = spice.gdpool(
'INS{}_FL_UNCERTAINTY'.format(ikid), 0, 1)
isd['nlines'] = spice.gipool('INS{}_PIXEL_LINES'.format(ikid), 0, 1)
isd['nsamples'] = spice.gipool('INS{}_PIXEL_SAMPLES'.format(ikid), 0, 1)
isd['original_half_lines'] = isd['nlines'] / 2.0
isd['original_half_samples'] = isd['nsamples'] / 2.0
isd['pixel_pitch'] = spice.gdpool('INS{}_PIXEL_PITCH'.format(ikid), 0, 1)
isd['ccd_center'] = spice.gdpool('INS{}_CCD_CENTER'.format(ikid), 0, 2)
isd['ifov'] = spice.gdpool('INS{}_IFOV'.format(ikid), 0, 1)
isd['boresight'] = spice.gdpool('INS{}_BORESIGHT'.format(ikid), 0, 3)
isd['transx'] = spice.gdpool('INS{}_TRANSX'.format(ikid), 0, 3)
isd['transy'] = spice.gdpool('INS{}_TRANSY'.format(ikid), 0, 3)
isd['itrans_sample'] = spice.gdpool('INS{}_ITRANSS'.format(ikid), 0, 3)
isd['itrans_line'] = spice.gdpool('INS{}_ITRANSL'.format(ikid), 0, 3)
try:
isd['odt_x'] = spice.gdpool('INS-{}_OD_T_X'.format(ikid), 0, 10)
except:
isd['odt_x'] = np.zeros(10)
isd['odt_x'][1] = 1
try:
isd['odt_y'] = spice.gdpool('INS-{}_OD_T_Y'.format(ikid), 0, 10)
except:
isd['odt_y'] = np.zeros(10)
isd['odt_y'][2] = 1
try:
isd['starting_detector_sample'] = spice.gdpool(
'INS{}_FPUBIN_START_SAMPLE'.format(ikid), 0, 1)
except:
isd['starting_detector_sample'] = 0
try:
isd['starting_detector_line'] = spice.gdpool(
'INS{}_FPUBIN_START_LINE'.format(ikid), 0, 1)
except:
isd['starting_detector_line'] = 0
# Get temperature from SPICE and adjust focal length
if 'focal_plane_temperature' in data.keys():
try: # TODO: Remove once WAC temperature dependent is working
temp_coeffs = spice.gdpool('INS-{}_FL_TEMP_COEFFS'.format(ikid), 0,
6)
temp = data['focal_plane_temperature']
isd['focal_length'] = distort_focal_length(temp_coeffs, temp)
except:
isd['focal_length'] = spice.gdpool(
'INS-{}_FOCAL_LENGTH'.format(ikid), 0, 1)
else:
isd['focal_length'] = spice.gdpool('INS-{}_FOCAL_LENGTH'.format(ikid),
0, 1)
# Get the radii from SPICE
rad = spice.bodvrd(isd['target_name'], 'RADII', 3)
radii = rad[1]
isd['semi_major_axis'] = rad[1][0]
isd['semi_minor_axis'] = rad[1][1]
# Now time
sclock = data['spacecraft_clock_count']
exposure_duration = data['exposure_duration']
exposure_duration = exposure_duration * 0.001 # Scale to seconds
# Get the instrument id, and, since this is a framer, set the time to the middle of the exposure
et = spice.scs2e(spacecraft_id, sclock)
et += (exposure_duration / 2.0)
isd['ephemeris_time'] = et
# Get the Sensor Position
loc, _ = spice.spkpos(isd['target_name'], et, reference_frame, 'LT+S',
spacecraft_name)
loc *= -1000
isd['x_sensor_origin'] = loc[0]
isd['y_sensor_origin'] = loc[1]
isd['z_sensor_origin'] = loc[2]
# Get the rotation angles from MDIS NAC frame to Mercury body-fixed frame
camera2bodyfixed = spice.pxform(instrument_name, reference_frame, et)
opk = spice.m2eul(camera2bodyfixed, 3, 2, 1)
isd['omega'] = opk[2]
isd['phi'] = opk[1]
isd['kappa'] = opk[0]
# Get the sun position
sun_state, lt = spice.spkezr("SUN", et, reference_frame,
data['lighttime_correction'], target_name)
# Convert to meters
isd['x_sun_position'] = sun_state[0] * 1000
isd['y_sun_position'] = sun_state[1] * 1000
isd['z_sun_position'] = sun_state[2] * 1000
# Get the velocity
v_state, lt = spice.spkezr(spacecraft_name, et, reference_frame,
data['lighttime_correction'], target_name)
isd['x_sensor_velocity'] = v_state[3] * 1000
isd['y_sensor_velocity'] = v_state[4] * 1000
isd['z_sensor_velocity'] = v_state[5] * 1000
# Misc. insertion
# A lookup here would be smart - similar to the meta kernals, what is the newest model, etc.
if 'model_name' not in data.keys():
isd['model_name'] = 'ISIS_MDISNAC_USGSAstro_1_Linux64_csm30.so'
isd['min_elevation'] = data['min_elevation']
isd['max_elevation'] = data['max_elevation']
spice.unload(obs_kernels) # Also unload iak
return isd