attribute definition: kernel_type_id
The kernel_type_id element identifies the type of the SPICE kernel file

attribute definition: mro:ccd_flag
The MRO:CCD_FLAG element identifies which CCDs were operating at the time of an observation. There is a special processing flag for each CCD used in the observation. The ordering for the values is RED0, RED1, RED2, RED3, RED4, RED5, RED6, RED7, RED8, RED9, IR10, IR11, BG12, and BG13. Values are as follows: ON = the CCD was actively acquiring data during the observation. OFF = the CCD was turned off during the observation.

attribute definition: mro:typespec_num_row
The center row of the type location for a particular CRISM type spectrum used as the numerator of the spectral ratio.

attribute definition: msl:gop_length
The MSL:GOP_LENGTH element provides an array of JPEG sizes in bytes, for each image in a GOP, starting with MSL:GOP_FRAME_INDEX 0. See note under MSL:GOP_TOTAL_FRAMES for GOP description.

attribute definition: mess:aex_bacb
The background brightness used for MDIS automatic exposure time calculation. In a test image that it analyzed to determine an exposure time using automatic exposure, DPU hardware generates a histogram of the image. The histogram is analyzed by the software to determine if the image is overexposed or underexposed, and the exposure time is adjusted accordingly by analyzing the histogram of raw DN values in different brightness bins. The background or dark current level (MESS:AEX_BACB) is taken into account and is assumed to be a constant value. A threshold of number of pixels (MESS:AEX_STHR) is allowed to exceed a target brightness (MESS:AEX_TGTB). Starting with the maximum value, the number of pixels exceeding the target is counted, and the brightness of the histogram bin in which that threshold is reached (MESS:AEX_STAT) is reported. The exposure time is scaled back by the ratio of MESS:AEX_TGTB/MESS:AEX_STAT.

attribute definition: msl:led_state_flag
The MSL:LED_STATE_FLAG element specifies, for the MAHLI, the state of the LED. LEDs states may be either ON or OFF. This keyword is not applicable for Mastcam and MARDI instruments.

attribute definition: timeout_parameter
The TIMEOUT_PARAMETER element provides the time at which an operation will timeout. Note: For MER, this is the revolve timeout for grinding. If the grinding doesn't complete a full revolution within this time it will determine that it is not making sufficient progress and end the grinding.

attribute definition: remote_node_privileges_id
The remote_node_priviledges_id element identifies the systems at a remote node (or nodes) which a user is priviledged to access.

attribute definition: exposure_scale_factor
The EXPOSURE_SCALE_FACTOR element is a multiplier to the exposure time.

attribute definition: signal_chain_id
The SIGNAL_CHAIN_ID element identifies the signal chain (electronic signal path) number selected for charge-coupled device (CCD) output. Note: For MARS EXPRESS the High-Resolution Stereo Colour Imager (HRSC) is composed of 10 channels, each consisting of a charge-coupled device (CCD). The data from these sensors are sent to the Data Processing Unit (DPU) via 4 signal chains. One chain can be used for the Super Resolution Channel (SRC), leaving 3 chains available for the other 9 HRSC sensors.

attribute definition: lro:dlre_ch9_radiance_max
The LRO:DLRE_CH9_RADIANCE_MAX element gives the maximum recorded value of radiance for channel 9 in a DLRE RDR data product.

attribute definition: ring_radial_mode_phase
The ring radial mode frequency element defines the rate at which a radial mode propagates around a ring. Negative values refer to modes that propagate in a retrograde direction. See also RING_RADIAL_MODE.

attribute definition: order_date
The order_date element provides the date when upon which an order was placed for a data set.

attribute definition: pixel_geometry_correction_flag
The PIXEL_GEOMETRY_CORRECTION_FLAG element defines a flag used to indicate whether a correction has already been applied to the present data to account for the fact that the imaging pixels were not square. This flag is 'Y' if this correction has been applied, 'N' if it has not.

attribute definition: msl:error_model_name
The MSL:ERROR_MODEL_NAME element specifies the method or algorithm used to create the error estimate. For MSL, the error estimation algorithm (XYZ and Range) are new, and will be continuously modified well past landing. Implemented algorithm names and descriptions are in the file pointed to by ^ERROR_DESC. The initial value is MIPL_CONST_DISPARITY_PROJECTED_V1, which means an arbitrary constant disparity error is assumed (in ERROR_MODEL_PARMS), which is projected through the camera models to approximate an error ellipse, which is then projected to the XYZ or range/crossrange axes depending on the file type.

attribute definition: system_bulletin_type
The system_bulletin_type element is a keyword that describes the type of bulletin displayed.

attribute definition: model_name
The MODEL_NAME element provides an identifier for the type or kind of model. The value should be one of a well defined set, providing an application program with sufficient information to know how to handle the rest of the parameters within the model. (CAHVORE-3 is the only one that uses model component vectors 1-8.)

attribute definition: role_desc
The role_desc element describes the role of an individual during his or her association with a particular institution. Note: The term 'role' is a more specific characterization of the individual's activities than is 'specialty' (see the specialty_name element).

attribute definition: time_from_closest_approach
The time_from_closest_approach element provides the time with respect to periapsis or closest approach.

attribute definition: msl:auto_focus_zstack_flag
The MSL:AUTO_FOCUS_ZSTACK_FLAG indicates whether or not Zstack image products were created during the auto focus imaging step. TRUE if Zstack is enabled.

attribute definition: earth_base_institution_name
The earth_base_institution_name element identifies a university, research center, NASA center or other institution associated with a laboratory or observatory.

attribute definition: spacecraft_clock_start_count
The spacecraft_clock_start_count element provides the value of the spacecraft clock at the beginning of a time period of interest. Note: In the PDS, sclk_start_counts have been represented in the following ways: Voyager - Flight Data Subsystem (FDS) clock count (floating point 7.2) Mariner 9 - Data Automation Subsystem, Mariner 10 - FDS - spacecraft_clock Mars Pathfinder - spacecraft clock

attribute definition: mro:measurement_atm_composition
The MRO:MEASUREMENT_ATM_COMPOSITION element identifies the atmospheric gases present in the environment during a laboratory spectral measurement.

attribute definition: bl_sql_format
This is the format required to generate CREATE statements in IDM SQL.

attribute definition: table_storage_type
The table_storage_type element indicates the order of storage for entries in a table. For enhanced portability and ease of display, the default and recommended storage type for tables is row major.

attribute definition: bl_name
The bl_name element is a unique 12-character name for elements used in any PDS data base table. These are only elements used in the data base.

attribute definition: quaternion_measurement_method
The QUATERNION_MEASUREMENT_METHOD element specifies the quality of the rover orientation If UNKNOWN the attitude should simply not be trusted. This is the grade given on Landing, for example. TILT_ONLY ishe attitude estimate is only good for tilt determination (2-axis knowledge). Activities which require azimuth knowledge should be careful. COURSE specifies the attitude estimate 'complete' (it has all three axes) but is crude. This can occur because sungaze has not yet been performed or because some event (such as traverses or IDD activity) have reduced the quality of the estimate (a.k.a. ThreeAxisCoarse FINE indicates that the Sungaze completed successfully, and the attitude estimate is sufficient for pointing HGA (a.k.a. ThreeAxisFine).

attribute definition: dawn:frame_parameter_unit
This keyword defines the units of FRAME_PARAMETER that define the individual frame parameters of an instrument that transfers single frames to the mass memory of the spacecraft or the instrument. The FRAME_PARAMETER element is also accompanied by the element FRAME_PARAMETER_DESC, e.g. FRAME_PARAMETER_DESC = ('EXPOSURE_DURATION', 'FRAME_SUMMING', 'EXTERNAL_REPETITION_TIME', 'EXTERNAL DARK_ACQUISITION_RATE')

attribute definition: articulation_dev_position_name
The ARTICULATION_DEV_POSITION_NAME element is an array of values that provides the formal names for each entry in ARTICULATION_DEV_POSITION. This element names the actual device doing the moving, (e.g., a filter wheel), not the name of a position (e.g., the filter itself).

attribute definition: software_icon_file_spec
The software_icon_file_spec element supplies the name of an image file in GIF format that contains the icon that represents a particular tool.

attribute definition: md5_checksum
The MD5 algorithm takes as input a file (message) of arbitrary length and produces as output a 128-bit 'fingerprint' or 'message digest' of the input. It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given prespecified target message digest. The MD5 algorithm is intended for digital signature applications. The MD5 algorithm is designed to be quite fast on 32-bit machines. In addition, the MD5 algorithm does not require any large substitution tables; the algorithm can be coded quite compactly. Most standard MD5 checksum calculators return a 32 character hexadecimal value containing lower case letters. In order to accomodate this existing standard, the PDS requires that the value assigned to the MD5_CHECKSUM keyword be a value composed of lowercase letters (a-f) and numbers (0-9). In order to comply with other standards relating to the use of lowercase letters in strings, the value must be quoted using double quotes. Example: MD5_CHECKSUM = '0ff0a5dd0f3ea4e104b0eae98c87f36c' The MD5 algorithm is an extension of the MD4 message-digest algorithm 1,2]. MD5 is slightly slower than MD4, but is more 'conservative' in design. MD5 was designed because it was felt that MD4 was perhaps being adopted for use more quickly than justified by the existing critical review; because MD4 was designed to be exceptionally fast, it is 'at the edge' in terms of risking successful cryptanalytic attack. MD5 backs off a bit, giving up a little in speed for a much greater likelihood of ultimate security. It incorporates some suggestions made by various reviewers, and contains additional optimizations. The MD5 algorithm has been placed in the public domain for review and possible adoption as a standard. For OSI-based applications, MD5's object identifier is md5 OBJECT IDENTIFIER ::= iso(1) member-body(2) US(840) rsadsi(113549) digestAlgorithm(2) 5} In the X.509 type AlgorithmIdentifier [3], the parameters for MD5 should have type NULL. The MD5 algorithm was described by its inventor, Ron Rivest of RSA Data Security, Inc., in an Internet Request For Comments document, RFC1321 (document available from the PDS). References ========== [1] Rivest, R., The MD4 Message Digest Algorithm, RFC 1320, MIT and RSA Data Security, Inc., April 1992. [2] Rivest, R., The MD4 message digest algorithm, in A.J. Menezes and S.A. Vanstone, editors, Advances in Cryptology - CRYPTO '90 Proceedings, pages 303-311, Springer-Verlag, 1991. [3] CCITT Recommendation X.509 (1988), The Directory - Authentication Framework.

attribute definition: lro:partial_lines
The LRO:PARTIAL_LINES element gives the number of lines of data in a data product that contain partial but incomplete data.

attribute definition: inst_cmprs_ratio
The inst_cmprs_ratio element provides the ratio of the size, in bytes, of the original uncompressed data file to its compressed form.

attribute definition: suffix_unit
The xxx_suffix_unit element of a 1-3 dimensional qube object (where xxx is an axis_name of the qube) provides the sequence of scientific units of the suffix items along the xxx axis. The length of the sequence is specified by the axes element, and its order must correspond to the order of names in the xxx_suffix_names element. In a Standard ISIS Qube, the axis names are restricted to SAMPLE, LINE and BAND. For the BAND axis, for example, the element will be named BAND_SUFFIX_UNIT.

attribute definition: second_standard_parallel
Please refer to the definition for first_standard_parallel element to see how second_standard_parallel is defined.

attribute definition: saturated_pixel_count
The saturated_pixel_count element provides a count of the number of pixels in the array that are at or exceed the maximum DN value.

attribute definition: maximum_sampling_parameter
The maximum_sampling_parameter element identifies the maximum value at which a given data item was sampled. For example, a spectrum that was measured in the 0.4 to 3.5 micrometer spectral region would have a maximum_sampling_parameter value of 3.5. The sampling parameter constrained by this value is identified by the sampling_parameter_name element. Note: The unit of measure for the sampling parameter is provided by the unit element.

attribute definition: z_axis_velocity_name
The Z_AXIS_VELOCITY_NAME element provides the formal name of the values within the Z_AXIS_VELOCITY element array.

attribute definition: north_azimuth_clock_angle
The north_azimuth_clock_angle element specifies the direction of the northward pointing azimuth on the surface of the target body as it appears at the center of an image. It is measured from the 'upward' direction, clockwise to the northward azimuth as projected into the image plane, assuming the image is displayed as defined by the SAMPLE_DISPLAY_DIRECTION and LINE_DISPLAY_DIRECTION elements. This keyword is intended to be a replacement for the NORTH_AZIMUTH keyword which has not been used in a consistent way in the past. Note: In some cases, knowledge of the inertial orientation of the ratational axis improves with time. This keyword necessarily reflects the state of knowledge of the rotational axis at the time of preparing the data product as given by the POLE_DECLINATION and POLE_RIGHT_ASCENSION elements. Note also that this quantity can vary significantly within a single image, particularly when a large fraction of the body is included in the image, so it is sensitive to the accuracy of an image's pointing information. This keyword is undefined if the central pixel of an image does not intersect the target body.

attribute definition: mro:specimen_max_particle_size
The MRO:SPECIMEN_MAX_PARTICLE_SIZE element gives the maximum particle size of a CRISM Spectral Library sample.

attribute definition: general_classification_type
The general_classification_type data element serves to allow data systems to group data objects or elements according to common characteristics. Its purpose is akin to subject access in library systems, because it allows the user to find a data element according to its membership in a larger category. In this document the general_classification_type is an indexing mechanism for data element names, to allow them to be published in a classified list entitled 'DATA ELEMENT CLASSIFIED LISTINGS'. See also: system_classification_id.

attribute definition: command_desc
The command_desc element provides a textual description associated with a COMMAND_NAME.

attribute definition: msl:local_mean_solar_stop_time
The MSL:LOCAL_MEAN_SOLAR_STOP_TIME element specifies the local mean solar [TBS].

attribute definition: dawn:operator
Used during ground tests to indicate the responsible operator of the test. Typically N/A for flight images.

attribute definition: best_non_range_sharp_model_tpt
The best_non_range_sharp_model_tpt provides the value of the theoretical echo profile, at half-baud (0.21 microsecond) intervals, that best approximates the peak of the non_range_sharp_echo_prof array. The optimal fit is made by matching best_non_range_sharp_model_tpt[i] with non_range_sharp_echo_prof[i+non_range_prof_corrs_index], where i is a value from 0 to 49.

attribute definition: volume_sets
The volume_sets element provides the number of volume sets in a volume series. For example, there are currently six (6) volume sets associated with the volume series MISSION TO VENUS.

attribute definition: sub_light_source_latitude
The sub_light_source_latitude element provides the latitude of the sub-light-source point. The sub-light-source point is the point on a body that lies under the light source.

attribute definition: mess:subf_dx3
The number of columns in the THIRD rectangular subframe within an MDIS image to be retained after image compression by the MESSENGER spacecraft main processor (MP). There may be up to five subframes per image as defined by MESS:SUBFRAME. Subframes are defined in the original 1024x1024 pixel MDIS coordinate system before pixel binning as described by MESS:FPU_BIN and MESS:PIXELBIN.

attribute definition: mro:azimuth_spacing_type
The AZIMUTH_SPACING_TYPE element specifies the type of azimuth (i.e. along-track) spacing of SHARAD radar footprints after ground processing. UNIFORM means that azimuth lines are evenly spaced. NOT UNIFORM means that azimuth lines are not evenly spaced.

attribute definition: maximum_radial_sampling_interv
The maximum_radial_sampling_interval element indicates the maximum radial spacing between consecutive points in a ring profile. In practice, this may be somewhat smaller than the maximum_radres element because the profile may be over-sampled.

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