urn:nasa:pds:vl_rocks:data_derived:vl2rocks 1.0 1.21.0.0 Product_Observational 2024-04-02 1.0 Initial PDS4 product label 1976-07-20Z 1982-12-31Z Viking Mission urn:nasa:pds:context:investigation:mission.viking data_to_investigation Viking Lander 2 Host urn:nasa:pds:context:instrument_host:spacecraft.vl2 is_instrument_host Camera 1 for VL2 Instrument urn:nasa:pds:context:instrument:cam1.vl2 is_instrument Camera 2 for VL2 Instrument urn:nasa:pds:context:instrument:cam2.vl2 is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars data_to_target vl2rocks.csv 1996-04-01T12:00:00 0 PDS DSV 1 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 [LIEBES, 1982], the XYZ coordinates of the rock in the Local Gravity-Normal (LGN) coordinate frame defined by [LIEBES, 1982], 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. These data were compiled by Henry Moore and John Keller [MOORE and KELLER, 1990; 1991]; 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. 499 Carriage-Return Line-Feed Comma 11 0 rock id 1 ASCII_String 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'. type 2 ASCII_String The type of area where 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). x position 3 ASCII_Real meter The X position of the center of the rock in the LGN frame defined by [Liebes, 1982]. y position 4 ASCII_Real meter The Y position of the center of the rock in the LGN frame defined by [Liebes, 1982]. z position 5 ASCII_Real meter The Z position of the center of the rock in the LGN frame defined by [Liebes, 1982]. length 6 ASCII_Real meter Estimated longest dimension of the rock. width 7 ASCII_Real meter Estimated width of the rock, measured approximately orthogonal to the length and in a plane parallel to the local average surface. height 8 ASCII_Real meter The height of the rock above the immediately adjacent regolith, measured approximately orthogonal to the length and width; the vertical exposure of the rock. angle 9 ASCII_Real degree 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. burial 10 ASCII_String 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) notes 11 ASCII_String Names of rock (if assigned) or other notes. In most cases, the field is held by 23 ASCII blank characters plus enclosing double quotes.