PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 84 FILE_RECORDS = 499 DATA_SET_ID = "VL1/VL2-M-LCS-5-ROCKS-V1.0" PRODUCT_ID = "VL2ROCKS.TAB" SPACECRAFT_NAME = "VIKING LANDER 2" INSTRUMENT_NAME = {"CAMERA 1","CAMERA 2"} TARGET_NAME = MARS PRODUCT_CREATION_TIME = 1996-04-01T12:00:00.000Z START_TIME = 1976-07-20T00:00:00.000Z STOP_TIME = 1982-11-05T23:59:59.999Z ^TABLE = "VL2ROCKS.TAB" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = 499 COLUMNS = 11 ROW_BYTES = 84 DESCRIPTION = "This table contains rock population data derived from Viking Lander 2 (VL2) images, maps derived from images, and other data. Each row in the table contains an ID keyed to hand-drawn overlays for the atlas of lander images [LIEBES1982], the XYZ coordinates of the rock in the Local Gravity-Normal (LGN) coordinate frame defined by [LIEBES1982], estimates of the dimensions of the rock and its orientation, a subjective evaluation of its burial state, and miscellaneous notes such as names associated with certain well-known rocks. The data fields are in 11 columns totaling 82 bytes each; each row is terminated with an ASCII carriage-return line-feed pair. These data were compiled by Henry Moore and John Keller [MOORE&KELLER1990] [MOORE&KELLER1991]; minor updates were made to values in the investigators' original file ROCKMOO1.DAT were made and burial status was added where available prior to archiving." OBJECT = COLUMN NAME = "ROCK ID" COLUMN_NUMBER = 1 DATA_TYPE = CHARACTER START_BYTE = 2 BYTES = 4 DESCRIPTION = "The ID number of the rock, assigned during inventory and measurement by investigators Moore and Keller. An ID beginning with the letters OC indicates a possible outcrop. The ID is unique to an overlay used by the investigators, but is not necessarily unique for the landing site; for example, two rocks at VL1 have the ID 'D 1'." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "TYPE" COLUMN_NUMBER = 2 DATA_TYPE = CHARACTER START_BYTE = 9 BYTES = 1 DESCRIPTION = "The type of area within which the rock was situated. Allowed values include: N = The near field - the surface accessible to the lander sampler arm (extending to approximately 3 m in front of the lander). The near field covers 12.75 square meters. F = The far field - the surface beyond the range of the sampler arm but for which rock position and dimensions could be reliably estimated (beyond approximately 3 m but less than 9-15 m in front of the lander). Does not include rocks in drift areas. The far field covers 42.83 square meters. D = Drift areas - surface at 3-15 m from the lander that was covered with significant amounts of drift material and where small rocks were not seen. Drift areas cover 28.09 square meters. X = Excluded from rock population counts (usually by being in a special location, such as under a lander foot pad)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "X POSITION" COLUMN_NUMBER = 3 DATA_TYPE = ASCII_REAL START_BYTE = 12 BYTES = 5 FORMAT = "F5.2" UNIT = METER DESCRIPTION = "The X position of the center of the rock in the LGN frame defined by [LIEBES1982]." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "Y POSITION" COLUMN_NUMBER = 4 DATA_TYPE = ASCII_REAL START_BYTE = 18 BYTES = 5 FORMAT = "F5.2" UNIT = METER DESCRIPTION = "The Y position of the center of the rock in the LGN frame defined by [LIEBES1982]." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "Z POSITION" COLUMN_NUMBER = 5 DATA_TYPE = ASCII_REAL START_BYTE = 24 BYTES = 5 FORMAT = "F5.2" UNIT = METER DESCRIPTION = "The Z position of the center of the rock in the LGN frame defined by [LIEBES1982]." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "LENGTH" COLUMN_NUMBER = 6 DATA_TYPE = ASCII_REAL START_BYTE = 30 BYTES = 5 FORMAT = "F5.2" UNIT = METER DESCRIPTION = "Estimated longest dimension of the rock." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "WIDTH" COLUMN_NUMBER = 7 DATA_TYPE = ASCII_REAL START_BYTE = 36 BYTES = 5 FORMAT = "F5.2" UNIT = METER DESCRIPTION = "Estimated width of the rock, measured approximately orthogonal to the length and in a plane parallel to the local average surface." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "HEIGHT" COLUMN_NUMBER = 8 DATA_TYPE = ASCII_REAL START_BYTE = 42 BYTES = 5 FORMAT = "F5.2" UNIT = METER DESCRIPTION = "The height of the rock above the immediately adjacent regolith, measured approximately orthogonal to the length and width; the vertical exposure of the rock." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ANGLE" COLUMN_NUMBER = 9 DATA_TYPE = ASCII_REAL START_BYTE = 48 BYTES = 5 FORMAT = "F5.0" UNIT = DEGREE DESCRIPTION = "Azimuth of the rock, measured clockwise from the LGN Y-axis to the long axis of the rock. A value 000 or 999 indicates that the azimuth was not determined; a value of 365 indicates that the length and width are equal." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "BURIAL" COLUMN_NUMBER = 10 DATA_TYPE = CHARACTER START_BYTE = 55 BYTES = 1 DESCRIPTION = "Subjective classification of burial state of the rock. Allowed values include: P = Perched (not significantly buried) H = Partially buried B = Buried U = Unknown (not tabulated)" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "NOTES" COLUMN_NUMBER = 11 DATA_TYPE = CHARACTER START_BYTE = 59 BYTES = 23 DESCRIPTION = "Names of rock (if assigned) or other notes. In most cases, the field is held by 23 ASCII blank characters plus enclosing double quotes." END_OBJECT = COLUMN END_OBJECT = TABLE END