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.