HiCat Data Dictionary

Catalog: HiRISE
The main HiRISE catalog contains all the information used in operating the HiRISE camera after it is attached to the MRO spacecraft. The information is divided into those related to suggesting, planning, commanding, retrieving, processing, validating, and distributing the observations. The tag that follows an observation through all these catalogs (and from Earth to Mars and back) is the unique Observation_ID. This text representation also forms the core of the product names. The HiRISE catalog also contains ancillary information needed in various uplink and downlink activities, such as the people making image suggestions, MRO project uplink files, SPICE and engineering data, and public image releases.
Table:Frost_Statistics
This table stores frost/ice statistics for observations. The information in this table can be used to monitor frost/ice found in observations, or to locate observations that may have frost or ice. The statistics are also used for refining the stretch algorithm in the HiMosMerge pipeline (and probably the color nomap pipelines, eventually).

Field Description Type Null Limits Size Key Default Authority Source
ID This is a unique, numerical ID assigned by the database to each record in this table. INT(10) unsigned auto_increment Not Null Primary Key db server
OBSERVATION_ID The observation id these statistics apply to. VARCHAR(25) Not Null HiMosMerge
FROST_FOUND If set to yes, then the statistics indicate frost is in the image. ENUM("NO","YES") Not Null HiMosMerge
INCIDENCE_ANGLE_USED Incidence angle used in the computation of the photometrically corrected scene brightness. This incidence angle used here may not necessarily be the same as the angle found in the Observation_Geometry. The value will be modified for high latitude observations to compensate for atmospheric haze effects. FLOAT HiMosMerge
REDUCE_FACTOR An integer value that defines the NXN box size of the reduced image used to acquire ratio and brightness statistics. INT(4) unsigned HiMosMerge
BG_PHOTO_CORRECTED BG maximum value that has photometric correction applied FLOAT HiMosMerge
BG_RED_RATIO_THRESHOLD BG/RED ratio threshold value FLOAT HiMosMerge
BG_PHOTO_CORRECTED_THRESHOLD Photometrically-corrected BG threshold value FLOAT HiMosMerge
INCIDENCE_ANGLE_THRESHOLD Incidence angle threshold value for when only the BG/RED ratio value is used in determining if ice/frost is present FLOAT HiMosMerge
BG_RED_RATIO_MASK_MINIMUM Minimum BG/RED ratio value of the brightest BG area of the scene FLOAT HiMosMerge
BG_RED_RATIO_MASK_MAXIMUM Maximum BG/RED ratio value of the brightest BG area of the scene FLOAT HiMosMerge
BG_RED_RATIO_MASK_AVERAGE Average BG/RED ratio value of the brightest BG area of the scene FLOAT HiMosMerge
IR_RED_RATIO_MASK_MINIMUM Minimum IR/RED ratio value of the brightest BG area of the scene FLOAT HiMosMerge
IR_RED_RATIO_MASK_MAXIMUM Maximum IR/RED ratio value of the brightest BG area of the scene FLOAT HiMosMerge
IR_RED_RATIO_MASK_AVERAGE Average IR/RED ratio value of the brightest BG area of the scene FLOAT HiMosMerge
BG_RED_RATIO_MINIMUM Minimum BG/RED ratio value of the entire scene FLOAT HiMosMerge
BG_RED_RATIO_MAXIMUM Maximum BG/RED ratio value of the entire scene FLOAT HiMosMerge
BG_RED_RATIO_AVERAGE Average BG/RED ratio value of the entire scene FLOAT HiMosMerge
IR_RED_RATIO_MINIMUM Minimum IR/RED ratio value of the entire scene FLOAT HiMosMerge
IR_RED_RATIO_MAXIMUM Maximum IR/RED ratio value of the entire scene FLOAT HiMosMerge
IR_RED_RATIO_AVERAGE Average IR/RED ratio value of the entire scene FLOAT HiMosMerge
IR_MINIMUM Minimum IR value of the NxN reduced image FLOAT HiMosMerge
IR_MAXIMUM Maximum IR value of the NxN reduced image FLOAT HiMosMerge
IR_AVERAGE Average IR value of the NxN reduced image FLOAT HiMosMerge
RED_MINIMUM Minimum RED value of the NxN reduced image FLOAT HiMosMerge
RED_MAXIMUM Maximum RED value of the NxN reduced image FLOAT HiMosMerge
RED_AVERAGE Average RED value of the NxN reduced image FLOAT HiMosMerge
BG_MINIMUM Minimum BG value of the NxN reduced image FLOAT HiMosMerge
BG_MAXIMUM Maximum BG value of the NxN reduced image FLOAT HiMosMerge
BG_AVERAGE Average BG value of the NxN reduced image FLOAT HiMosMerge
LAST_UPDATE The last time this record was updated. TIMESTAMP db server

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