urn:nasa:pds:vl_rocks:data_derived:vl2axrat 1.0 1.21.0.0 Product_Observational 2024-04-03 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 vl2axrat.csv 1998-05-12T18:00:00 0 PDS DSV 1 This file contains binned results from calculations based on dimensions of Mars rocks near the Viking Lander 2 site. Estimates of surface area and of three axial ratios were computed from data in file vl2rocks.csv; results were binned according to the average diameter as follows: AREA = L*W*PI/4 binned according to DLW = SQRT(L*W) ARLW = MIN(L,W)/MAX(L,W) binned according to DLW = SQRT(L*W) ARWH = MIN(W,H)/MAX(W,H) binned according to DWH = SQRT(W*H) ARLH = MIN(L,H)/MAX(L,H) binned according to DLH = SQRT(L*H) where ARxy denotes axial ratio of dimensions x and y Dxy denotes average diameter using dimensions x and y L = estimated longest dimension of the rock W = estimated width of the rock (orthogonal to length) H = estimated vertical exposure of the rock and MIN(X,Y) is the smaller of X and Y MAX(X,Y) is the larger of X and Y Bin boundaries were set at 1/128th meter and at powers of SQRT(2) larger (0.008, 0.011, ... , 1.000, 1.414 m). The AREA covered by rocks in each bin was summed; the average and standard deviation of the axial ratios for rocks in each bin were calculated. The results are tabulated according to surface type (drift area, far field, near field, and excluded) and by burial state (perched, partially buried, buried, and unknown). The cumulative results for all bins are included for each surface type and burial state combination. 304 Carriage-Return Line-Feed Comma 16 0 surface_type 1 ASCII_Integer A numerical key denoting the type of surface within which the rock was found. Values include: 1 = Drift materials 2 = Far field (approximately 3-9 m from the spacecraft) 3 = Near field (less than about 3 meters from the spacecraft) 4 = Excluded (not included in the statistical calculations) burial_state 2 ASCII_Integer A numerical key denoting the burial state of the rock. Values include: 1 = Perched (essentially not buried) 2 = Partially buried 3 = Buried 4 = Unknown bin_number 3 ASCII_Integer The bin number, starting with 1 for rocks that could not be assigned to a bin (undefined) and 2 for rocks with the smallest average diameter (less than 0.008 m). Bin number increases monotonically to the largest bin number (18), which corresponds to rocks with average diameter greater than or equal to 1.414 m. Rocks having burial state 'buried' (3) and for which height (H) is one of the dimensions required for calculation are assigned to bin 1 since the results are not considered to be reliable. The field is left blank for summary lines in the table (rocks of all diameters). lower_bin_boundary 4 ASCII_Real meter The lower boundary for the bin. Rocks in this bin must have average diameters greater than or equal to this value. Left blank if bin number 1 (rocks with undefined average diameter) or bin number 2 (rocks with average diameters less than 0.008). upper_bin_boundary 5 ASCII_Real meter The upper boundary for the bin. Rocks in this bin must have average diameters less than this value. Left blank if bin number 1 (rocks with undefined average diameter or bin number 18 (rocks with average diameters greater than or equal to 1.414). surface_area 6 ASCII_Real m^2 The surface area covered by rocks in this bin. n_area 7 ASCII_Integer Number of rocks contributing to the surface area in field 6. arlw_average 8 ASCII_Real The average width-to-length axial ratio for rocks in this bin. arlw_standard_deviation 9 ASCII_Real The standard deviation of the width-to-length axial ratio for rocks in this bin. n_arlw 10 ASCII_Integer The number of rocks contributing to the average axial ratio in field 8. arwh_average 11 ASCII_Real The average width-to-height axial ratio for rocks in this bin. -9.9 arwh_standard_deviation 12 ASCII_Real The standard deviation of the width-to-height axial ratio for rocks in this bin. -9.9 n_arwh 13 ASCII_Integer The number of rocks contributing to the average axial ratio in field 11. arlh_average 14 ASCII_Real The average height-to-length axial ratio for rocks in this bin. -9.9 arlh_standard_deviation 15 ASCII_Real The standard deviation of the height-to-length axial ratio for rocks in this bin. -9.9 n_arlh 16 ASCII_Integer The number of rocks contributing to the average axial ratio in field 14.