This XML schema file has been generated from the Information Model.
The CIRS Cubes Specific Attributes class
provides local attributes used by CIRS higher order
products.
The CIRS Specific Attributes class provides
local attributes used by CIRS observations and derived
products.
This is the umbrella class for the Cassini
mission dictionary.
The ISS Specific Attributes class provides local
attributes used by ISS observations.
The PPI Specific Attributes class provides local
attributes used by fields and particles
instruments.
The UVIS Specific Attributes class provides
local attributes used by UVIS observations.
The VIMS Specific Attributes class provides
local attributes used by VIMS observations.
This section contains the simpleTypes that provide more constraints
than those at the base data type level. The simpleTypes defined here build on the base data
types. This is another component of the common dictionary and therefore falls within the
common namespace.
The antiblooming_state_flag element indicates
whether antiblooming was used for this image. Blooming occurs
when photons from an individual cell in a CCD array overflow
into surrounding cells. Antiblooming measures are used to either
prevent or correct for this effect.
The background_sampling_mode_id element
identifies the background sampling mode. In a scanning type
camera, background refers to the dark current measurement that
is taken, with the camera shutter closed, while the scanner
returns to the beginning of the next line. The value of the
background may then be subtracted from the data to produce a
more accurate measurement. Note: For Cassini, sampling modes
allow up to four samples to be averaged for each background
point.
The bias_state_id element identifies the bias
state of the infrared channel of the VIMS
instrument.
The bias_strip_mean element provides the mean
value of the bias strip (also known as overclocked pixels). The
bias strip is an area of a CCD that provides a measure of the
bias level of the electronics (ie., electronics noise). It is
not affected by dark current. Note: For Cassini, this mean does
not include the values from the first and last lines of the
CCD.
The calibration_lamp_state_flag element
indicates whether a lamp used for onboard camera calibration is
turned on or off.
The command_file_name element provides the name
of the file containing the commanded observation description for
this product. Note: For Cassini, this comes from the Instrument
Operations Interface (IOI) file.
The command_sequence_number element provides a
numeric identifier for a sequence of commands sent to a
spacecraft or instrument.
The compression_type element indicates the type
of compression/encoding used for data that was subsequently
decompressed/unencoded before storage.
The compressor_id element identifies the
compressor through which the data was
compressed.
The dark_strip_mean element provides the mean
value of the pixels in the dark strip area of a CCD. The dark
strip is an area of the CCD which is covered in such a way as to
receive no light. The dark strip provides a measure of the dark
current in the CCD. Note: For Cassini, the dark strip pixels
were referred to as extended pixels. Also, the mean was
calculated without the values from the first and last lines of
the CCD.
The data_buffer_state_flag element indicates
whether the data buffer onboard the spacecraft was enabled to
allow for the temporary storage of the data before being
downloaded.
The data_conversion_type element provides the
method of conversion used to reduce an image from one bit depth
to another. Note: For Cassini, this means conversion of a
selected image from 12 to 8 bits.
The delayed_readout_flag element provides an
indication of whether or not an image had to remain stored on a
CCD while some some other instrument function was taking place.
Note: for Cassini, the delay in the image readout is due to the
readout of the alternate camera image from the
CCD.
The detector_temperature is the temperature that
the instrument (detector) operated at while a measurement was
made.
The electronics_bias element provides the
commanded electronics bias value that is used to ensure that all
digital number (DN) values in the data are greater than
zero.
The expected_packets element provides the total
number of telemetry packets which constitute a complete data
product, i.e., a data product without missing
data.
The exposure_duration element provides the value
of the time interval between the opening and closing of an
instrument aperture (such as a camera
shutter).
The fast_hk_item_name element provides the names
of the housekeeping items which were collected. Fast
housekeeping is a partial gathering of the available engineering
data values, or items, that pertain to and describe the
condition of the instrument itself. Note: For Cassini, up to
four items can be collected, via fast housekeeping, and stored
in the band suffix, or backplane, of the spectral cube. The fast
housekeeping value will always supercede the slow housekeeping
value, if present. If fast housekeeping is not used, this item
will not be present in the label.
The fast_hk_pickup_rate element provides the
rate at which fast housekeeping is collected. Fast housekeeping
is a partial gathering of the available engineering data values,
or items, that pertain to and describe the condition of the
instrument itself. Note: For Cassini, this value (n) is stored
in the band suffix, or backplane, of the spectral cube for the
infrared channel. If (n) is set to zero, then housekeeping
values will be collected at every pixel (i.e., every pixel of
the backplane will have a value). If (n) is set from 1 to
swath_length, then housekeeping values will be collected every
nth line (i.e., only the first pixel of every nth line of the
backplane will have a value). If no infrared housekeeping items
were selected for the cube, then this keyword will not be
present.
The filter_name element provides the
commonly-used name of the instrument filter through which an
image or measurement was acquired or which is associated with a
given instrument mode.
The filter_temperature element provides the
temperature of the filter wheel housing.
Line coordinate at the center of the first line
element
Sample coordinate at the center of the first
sample element
The flight_software_version_id element
identifies the version of the instrument flight software used to
acquire the image.
Focal plane used in CIRS
observations.
The gain_mode_id element identifies the gain
state of an instrument. Gain is a constant value which is
multiplied with an instrument's output signal to increase or
decrease the level of that output.
HDAC deuterium cell filter voltage
levels
The value associated with the HDAC channel which
defines the number of integrations taken at a particular
filament level. HDAC integration time is always 125
milliseconds.
HDAC hydrogen cell filter voltage
levels
The state of the high voltage power power supply
on an instrument.
The housekeeping_clock_count element provides
the spacecraft clock value at the time that slow housekeeping
was collected. Slow housekeeping is the gathering of all
available engineering data values, or items, that pertain to and
describe the condition of the instrument itself. Typically this
value is read from the last (most recent) housekeeping packet
received before the end of the spectral cube
downlink.
The image_mid_time element provides the time at
which the exposure of the image was half way through its
duration. This value is calculated from the formula,
spacecraft_clock_stop_count - (exposure_duration/2), and then
converted to UTC. Note: For Cassini, when the shutter is
inhibited (i.e., shutter_state_id='Disabled'), the
image_mid_time = start_date_time = stop_date_time, and all three
represent the start of the exposure window during the prepare
cycle of the image.
The image_number element is a value obtained
from the spacecraft_clock_start_count. The image number is
another commonly used identifier for an image.
The image_observation_type element identifies
the type or purpose of an observation that may be associated
with an image. Image observation types include limb, black sky,
spacecraft calibration, or other image attribute that may be
used for identification.
The inst_cmprs_name element identifies the type
of on-board compression used for data storage and
transmission.
The inst_cmprs_param element is a variable which
specifies on-board compression determination by image quality or
by compression factor, based on a selected on-board compression
mode.
The inst_cmprs_rate element provides the average
number of bits needed to represent a pixel for an on-board
compressed image.
The inst_cmprs_ratio element provides the ratio
of the size, in bytes, of the original uncompressed data file to
its compressed form.
The inst_cmprs_type element identifies the type
of on-board compression used for data storage and
transmission.
The instrument_data_rate element provides the
rate at which data were transmitted from an instrument to the
spacecraft.
The instrument_mode_id element provides an
instrument-dependent designation of operating mode. This may be
simply a number, letter or code, or a word such as 'normal',
'full resolution', 'near encounter', or 'fixed
grating'.
The instrument_temperature element provides the
temperature of an instrument or some part of an
instrument.
The integration_delay_flag indicates whether the
integration time for a rapidly acquired spectral cube was
extended by shrinking the pixel synch pulse.
The duration of a time over which a particular
instrument is integrating.
The interframe_delay_duration element provides
the duration of the delay between the end of one frame and the
start of the next to allow time for the scanning mirror to
return to its starting position.
The interline_delay_duration element provides
the duration of the delay between the end of one line of an
image and the start of the next. Note: For Cassini, this refers
to the infrared line. Time is allowed for: 1) the infrared
duration mirror to return to its starting point, 2) collection
of background data and 3) the alignment of the exposure center
times between the infrared and visible
channels.
Line coordinate at the center of the last line
element
Sample coordinate at the center of the last
sample element
The light_flood_state_flag element indicates the
mode (on or off) of light flooding for an
instrument.
For equirectangular cubes, this is the latitude
of the pixel center, in degrees. For point perspective cubes, it
is the scaled offset from the body center, in the direction of
increasing J2000 Declination, in milliradians.
Coordinate name for the line
axis
The mean equatorial angular radius of the body
as seen by the spacecraft
The mean angle between the radial vector of the
spacecraft and the radial vector of the Sun, from the center of
the body.
The mean planetographic latitude of the
boresight at the ZPD time.
The mean local solar time in hours since
midnight.
The mean west longitude of the boresight at the
ZPD time.
The mean right ascension of the boresight in the
J2000 coordinate system.
The mean angle between the direction vector of
the Sun and the normal to the surface at the point at which the
boresight intersects the surface.
The mean angle between the direction vector of
the Sun and the normal to the surface at the point at which the
boresight intersects the surface.
The method_description element describes the
method used to perform a particular
observation.
The missing_lines element is the total number of
lines of data missing from an image or observation when it was
received on Earth. Note: For Cassini, this provides the number
of missing or incomplete lines of image data.
The missing_packet_flag element indicates
whether or not there were telemetry packets that were expected
but not received.
The missing_pixels element provides the number
of pixels missing from an image or observation. Note: For
Cassini, this refers to the core of a spectral cube, which
indicates that the expected number of pixels (as determined by
the commanded cube dimensions) did not arrive. The positions of
these pixels are filled with CORE_NULL. Pixels purposefully set
to CORE_NULL (e.g., due to time insertion) are not included in
this total.
The mission_phase_name identifies a time period
within the mission.
Ephemeris time in seconds past J2000 at the
beginning of a time period of interest.
Ephemeris time in seconds past J2000 at the end
of a time period of interest.
The observation_id element uniquely identifies a
scientific observation.
The state of the occultation port covering an
instrument.
The observation description command, the ID of
the command sequence sent to the UVIS instrument to generate
observations.
The offset_flag element indicates whether an
offset was used to shift or displace a data value. Note: For
Cassini, this indicates whether an Occultation Mode spectral
cube used the commanded X_OFFSET and Z_OFFSET ('OFF') or used
offsets calculated by the flight software from the non-
Occultation Mode spectral cube ('ON').
The optics_temperature element provides the
temperature of the front optics of an
instrument.
The order_number element is a unique
system_generated number which is used to identify an order of
which observations were executed.
The overwritten_channel_flag element indicates
whether spectral data was sacrificed in lieu of more precise
timing information. Note: For Cassini, if the flag is set to
'On', the observation time values are collected for each pixel
and stored in the backplanes of the spectral cube. The spectral
data in channels 347-352 will be set to the value
-8192.
The packing_flag element indicates whether
multiple spectral cubes were packed and stored as a single
spectral cube product, due to their small size and lack of
unique timing information.
The parallel_clock_voltage_index element
provides the commanded parallel clock voltage value which
controls clocking frequency.
The parameter_set_id element identifies the
parameter set which was used to produce the data file. Note: For
Cassini, typically this will be the command_sequence_number with
a counter/character appended to the end.
The power_state_flag element indicates whether
the infrared channel is turned on or off."
The power_state_flag element indicates whether
the visible channel is turned on or off."
The prepare_cycle_index element provides the
element number within the Prepare Cycle table selected for this
image. Prepare cycles include activities carried on within an
instrument between sequential data acquisition and CCD readout
operations. This includes such things as light flooding and
erasure of the CCD and filter wheel stepping. Note: for Cassini,
the Prepare Cycle table provides a translation of these values
into cycle durations in seconds.
The readout_cycle_index element provides the
element number within the Readout Cycle table selected for this
image. The readout cycle of an instrument involves that part of
its function involved in reading the light values out of a CCD
array. Note: for Cassini, the Readout Cycle table provides a
translation of these values into cycle durations in
seconds.
The received_packets element provides the total
number of telemetry packets which constitute a reconstructed
data product.
For equirectangular cubes, this is the West
longitude of the pixel center, in degrees. For point perspective
cubes, it is the scaled offset from the body center, in the
direction of decreasing J2000 Right Ascension, in
milliradians.
Coordinate name for the sample
axis
The sampling_mode_id element identifies the
resolution mode of the infrared channel.
The sampling_mode_id element identifies the
resolution mode of the visible channel.
The scan_mode_id element identifies one of
several internal rates for data acquisition by an
instrument.
The sensor_head_electronics_temperature element
provides the temperature of the sensor head
electronics.
TThe sequence_id element provides an
identification of the spacecraft sequence associated with the
given product..
The sequence_number element indicates a number
designating the place occupied by an item in an ordered
sequence.
The sequence_title element provides the title
assigned to a particular observation sequence during planning or
data processing.
The shutter_mode_id element identifies the state
of an imaging instrument's shutter during image acquisition.
Note: the instrument shutter mode affects the radiometric
properties of the camera.
The shutter_state_id element provides an
indication of the state of an instrument's shutters at the time
of an exposure.
The position of the slit on the Cassini UVIS
instrument.
The snapshot_mode_flag element indicates whether
the instrument was to end data collection either after one
instance or after the commanded duration.
The spacecraft_clock_count_partition element
indicates the clock partition active for
spacecraft_clock_start_count and spacecraft_clock_stop_count
elements.
The spacecraft_clock_start_count attribute
provides the value of the spacecraft clock at the actual start
of image acquisition. There may be small inconsistencies with
start_date_time due to varying correlation between UTC and the
spacecraft clock. For purposes of data analysis the spacecraft
clock value should be used. The format of this field is
compatible with the NAIF Toolkit software where s = seconds
converted from the clock's coarse counter and m = seconds
converted from the clock's fine counter.
The spacecraft_clock_stop_count attribute
provides the value of the spacecraft clock at the actual end of
image acquisition. There may be small inconsistencies with
stop_date_time due to varying correlation between UTC and the
spacecraft clock. For purposes of data analysis the spacecraft
clock value should be used. The format of this field is
compatible with the NAIF Toolkit software where s = seconds
converted from the clock's coarse counter and m = seconds
converted from the clock's fine counter.
The spectral_editing_flag element indicates
whether the spectral cube has been reduced to a subset of the
bands in the original cube.
The spectral_summing_flag element indicates
whether the spectral cube has had some bands summed to reduce
the spacecraft's Solid State Recorder (SSR) data
volume.
The swath_length element provides the number of
pixels (in the lines direction) collected for a spectral cube
during an observation. Note: For Cassini, this will differ from
CORE_ITEMS for Occultation Mode cubes.
The swath_width element provides the number of
pixels (in the samples direction) collected for a spectral cube
during an observation. Note: For Cassini, this will differ from
CORE_ITEMS for Occultation Mode cubes.
The telemetry_format_id element supplies a
telemetry format code.
The state of the Cassini UVIS instrument's test
pulse mechanism.
The integrated radiance under the power
spectrum.
The x_offset element indicates a shift or
displacement of a data value in the x-direction. Note: For
Cassini, this refers to the commanded mirror offset (in the x
direction) within the infrared normal resolution field of view.
For visible and infrared, the actual data collection area will
differ when not in normal resolution mode.
The z_offset element indicates a shift or
displacement of a data value in the z-direction. Note: For
Cassini, this refers to the commanded mirror offset (in the z
direction) within the infrared normal resolution field of view.
For visible and infrared, the actual data collection area will
differ when not in normal resolution mode.