# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20110318.10km.txt # # Users are free to use the information hosted on this site in their research, provided credit is given to the NOAA National Environmental # Satellite, Data, and Information Service (NESDIS) Center for Satellite Applications and Research (STAR) Laboratory for Satellite Altimetry (LSA). # # Data and images displayed on NOAA/NESDIS/STAR sites are provided for experimental use only and are not official operational NOAA products. More # information is available at: http://www.star.nesdis.noaa.gov/star/productdisclaimer.php # # Data Description: # This data file contains the NOAA / NESDIS / STAR / LSA Polar Ocean Data System (PODS) Arctic Surface Roughness Product. The Arctic Surface Roughness # Product is derived from Airborne Topographic Mapper (ATM) lidar elevation data acquired during annual, low-altitude NASA Operation IceBridge # airborne surveys over Arctic sea ice. IceBridge ATM data were acquired between March and May, 2009 - 2019. # # Due to the conical scanning geometry of the ATM lidar, across-track sampling is non-uniform, with sampling density greatest at the swath edges. To # account for the variation in sample density, ATM elevation data are gridded (See Figure 1 on Data Product Webpage). Each grid cell has an along-track # dimension of 30 m and an across-track dimension that is inversely proportional to the across-track sampling density. The grid configuration optimizes # ATM sample density providing high-resolution measurements of sea ice surface roughness while still containing enough point measurements for robust # statistical calculations. Statistics are computed on the distribution of sea ice surface roughness for 10 km along-track segments, for each aircraft # flight line. # # Citation: # Users are asked to cite the following publication whenever these data are used: # Connor, L., S. Farrell and D. McAdoo (2017), A decadal study of interannual variability in Arctic sea ice freeboard using airborne laser altimetry # (2006-2016), presented at the 2017 IGS International Symposium on Polar Ice, Polar Climate, and Polar Change, Boulder, Colorado, 14-19 Aug. 2017. # # Point of Contact: Laurence.Connor@noaa.gov # # Data Product Webpage: https://www.star.nesdis.noaa.gov/sod/lsa/SeaIce/SeaIceSurfaceRoughness.php # # File format is comma separated ascii text, and columns are as follows: # 1. UTC Time (YYYY-MM-DD HH:MM:SS), associated with average data acquisition time within 10km segment # 2. Latitude (degrees), average of measurements within 10km segment # 3. Longitude (degrees), average of measurements within 10km segment # 4. Mean surface roughness (m), arithmetic mean of all surface roughness measurements in 10km segment # 5. Maximum surface roughness (m), maximum value of surface roughness in 10km segment # 6. Surface roughness 5th percentile (m), 5th percentile height of all surface roughness measurements in 10km segment # 7. Surface roughness 25th percentile (m), 25th percentile height of all surface roughness measurements in 10km segment # 8. Surface roughness 75th percentile (m), 75th percentile height of all surface roughness measurements in 10km segment # 9. Surface roughness 95th percentile (m), 95th percentile height of all surface roughness measurements in 10km segment # 10. Surface roughness 99th percentile (m), 99th percentile height of all surface roughness measurements in 10km segment # # # # # # -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Time, Latitude, Longitude, Mean surface roughness, Maximum surface roughness, Surface roughness 5th percentile, Surface roughness 25th percentile, Surface roughness 75th percentile, Surface roughness 95th percentile, Surface roughness 99th percentile 2011-03-18 13:30:17,85.118077763,-86.765275473,0.19,0.67,0.11,0.14,0.22,0.36,0.48 2011-03-18 13:31:42,85.16929465,-87.637062226,0.20,0.62,0.10,0.14,0.25,0.35,0.43 2011-03-18 13:33:08,85.219377146,-88.527246795,0.20,0.53,0.11,0.14,0.24,0.35,0.42 2011-03-18 13:34:33,85.268381555,-89.435284501,0.24,0.86,0.10,0.17,0.30,0.44,0.54 2011-03-18 13:35:59,85.315962214,-90.363658419,0.18,0.57,0.10,0.13,0.21,0.31,0.46 2011-03-18 13:37:25,85.362275086,-91.310930997,0.16,0.50,0.09,0.12,0.19,0.28,0.38 2011-03-18 13:38:51,85.4076403709,-92.2745986051,0.19,0.47,0.10,0.13,0.23,0.31,0.42 2011-03-18 13:40:18,85.451669126,-93.257281842,0.17,0.45,0.10,0.13,0.20,0.28,0.35 2011-03-18 13:41:44,85.494106129,-94.260398092,0.22,0.59,0.11,0.15,0.26,0.40,0.49 2011-03-18 13:43:11,85.535373147,-95.280785035,0.19,0.45,0.10,0.14,0.22,0.31,0.40 2011-03-18 13:44:38,85.575132988,-96.320240275,0.16,0.51,0.08,0.10,0.20,0.30,0.38 2011-03-18 13:46:05,85.613495684,-97.377665013,0.20,0.68,0.11,0.15,0.23,0.32,0.48 2011-03-18 13:47:32,85.650369435,-98.453195285,0.21,0.94,0.11,0.14,0.25,0.36,0.53 2011-03-18 13:48:59,85.6856386458,-99.5470330187,0.18,0.71,0.08,0.11,0.23,0.37,0.52 2011-03-18 13:50:27,85.719498049,-100.660234672,0.19,0.54,0.10,0.14,0.23,0.31,0.40 2011-03-18 13:51:55,85.751653901,-101.791828908,0.18,0.52,0.10,0.13,0.20,0.30,0.39 2011-03-18 13:53:14,85.7794148144,-102.82860085,0.17,0.40,0.09,0.13,0.20,0.30,0.35 2011-03-18 14:02:01,85.737229355,-103.501473144,0.20,0.48,0.10,0.15,0.24,0.34,0.42 2011-03-18 14:03:27,85.652084739,-103.049878364,0.20,0.70,0.10,0.14,0.24,0.36,0.51 2011-03-18 14:04:49,85.568476147,-102.620608414,0.20,0.64,0.06,0.15,0.25,0.37,0.47 2011-03-18 14:06:10,85.4845548364,-102.209734138,0.21,0.49,0.09,0.16,0.25,0.34,0.40 2011-03-18 14:07:31,85.400416687,-101.813641014,0.17,0.39,0.09,0.13,0.20,0.27,0.34 2011-03-18 14:08:52,85.316048668,-101.432407786,0.16,0.49,0.09,0.12,0.20,0.27,0.33 2011-03-18 14:10:13,85.23150983,-101.063667863,0.16,0.45,0.08,0.11,0.19,0.27,0.34 2011-03-18 14:11:34,85.14676557,-100.708304723,0.16,0.51,0.08,0.11,0.18,0.27,0.37 2011-03-18 14:12:54,85.061838756,-100.365241397,0.16,0.61,0.09,0.12,0.19,0.27,0.36 2011-03-18 14:14:15,84.976731343,-100.034131585,0.19,0.64,0.08,0.12,0.25,0.35,0.52 2011-03-18 14:15:35,84.891441959,-99.714723065,0.22,1.07,0.10,0.16,0.25,0.41,0.58 2011-03-18 14:16:56,84.806063869,-99.403585801,0.22,0.80,0.09,0.15,0.27,0.39,0.50 2011-03-18 14:18:16,84.720513854,-99.103342854,0.19,0.56,0.09,0.13,0.24,0.37,0.45 2011-03-18 14:19:37,84.634857557,-98.811521639,0.20,0.54,0.10,0.15,0.24,0.34,0.44 2011-03-18 14:20:57,84.549009392,-98.530861469,0.24,0.92,0.12,0.18,0.28,0.38,0.56 2011-03-18 14:22:17,84.463034112,-98.258912334,0.20,0.54,0.08,0.16,0.24,0.33,0.39 2011-03-18 14:23:38,84.376953755,-97.994720102,0.20,0.66,0.11,0.14,0.24,0.36,0.46 2011-03-18 14:24:58,84.290761889,-97.738346803,0.25,0.63,0.12,0.18,0.31,0.42,0.54 2011-03-18 14:26:19,84.204504251,-97.488054695,0.26,0.73,0.11,0.18,0.32,0.43,0.62 2011-03-18 14:27:39,84.118039509,-97.248598863,0.18,0.46,0.10,0.13,0.22,0.31,0.39 2011-03-18 14:28:59,84.031469887,-97.016243201,0.16,0.45,0.04,0.12,0.20,0.30,0.38 2011-03-18 14:30:19,83.944903883,-96.787063685,0.20,0.70,0.09,0.13,0.23,0.37,0.47 2011-03-18 14:31:40,83.858210177,-96.565525167,0.19,0.55,0.08,0.12,0.23,0.35,0.44 2011-03-18 14:33:00,83.771281441,-96.355258346,0.21,0.50,0.12,0.15,0.24,0.35,0.42 2011-03-18 14:34:20,83.684470753,-96.143830689,0.19,0.61,0.10,0.13,0.23,0.35,0.48 2011-03-18 14:35:41,83.597600742,-95.937244872,0.19,0.47,0.10,0.14,0.23,0.34,0.41 2011-03-18 14:37:01,83.5105685903,-95.7390360507,0.19,0.48,0.09,0.13,0.23,0.35,0.41 2011-03-18 14:38:21,83.423483421,-95.545292368,0.20,0.58,0.08,0.14,0.25,0.36,0.46 2011-03-18 14:39:41,83.336279949,-95.358211944,0.23,0.57,0.12,0.17,0.27,0.38,0.45 2011-03-18 14:41:02,83.249070527,-95.173792465,0.19,0.46,0.10,0.13,0.23,0.32,0.39 2011-03-18 14:42:23,83.161742945,-94.995761587,0.21,0.50,0.12,0.17,0.25,0.32,0.38 2011-03-18 14:43:44,83.07435688,-94.821999151,0.22,0.61,0.12,0.17,0.26,0.37,0.48 2011-03-18 14:45:05,82.98692064,-94.652172176,0.21,0.53,0.11,0.16,0.24,0.32,0.39 2011-03-18 14:46:27,82.899410846,-94.486999412,0.24,0.82,0.12,0.17,0.29,0.43,0.56 2011-03-18 14:47:48,82.811888583,-94.324364578,0.25,0.91,0.10,0.18,0.30,0.48,0.73 2011-03-18 14:49:09,82.7242384,-94.168060192,0.22,0.55,0.11,0.17,0.25,0.35,0.41 2011-03-18 14:50:28,82.63661574,-94.012643252,0.18,0.56,0.09,0.12,0.21,0.32,0.44 2011-03-18 14:51:48,82.548867978,-93.86344943,0.26,0.83,0.10,0.19,0.33,0.46,0.59 2011-03-18 14:53:11,82.460928114,-93.716193005,0.23,0.64,0.10,0.17,0.27,0.38,0.46 2011-03-18 14:54:45,82.36469987,-93.558429597,0.30,1.07,0.14,0.21,0.35,0.53,0.74 2011-03-18 14:56:07,82.2792782153,-93.4231731705,0.26,0.68,0.12,0.19,0.31,0.45,0.56 2011-03-18 15:03:28,82.461544061,-93.122715559,0.28,0.70,0.10,0.19,0.36,0.48,0.60 2011-03-18 15:04:39,82.552829853,-93.15106604,0.22,0.73,0.08,0.15,0.28,0.40,0.49 2011-03-18 15:05:50,82.644197807,-93.177254182,0.23,0.90,0.09,0.15,0.29,0.42,0.55 2011-03-18 15:07:01,82.735141295,-93.205246987,0.24,0.68,0.12,0.18,0.28,0.37,0.45 2011-03-18 15:08:11,82.824949973,-93.232492814,0.27,0.86,0.12,0.19,0.34,0.49,0.61 2011-03-18 15:09:21,82.91471297,-93.260734241,0.25,0.77,0.10,0.17,0.30,0.44,0.58 2011-03-18 15:10:32,83.004475741,-93.289347673,0.21,0.55,0.11,0.16,0.26,0.34,0.42 2011-03-18 15:11:42,83.094236939,-93.318569525,0.22,0.60,0.11,0.17,0.27,0.35,0.45 2011-03-18 15:12:53,83.1839894839,-93.3499773282,0.22,0.65,0.11,0.16,0.26,0.40,0.47 2011-03-18 15:14:03,83.273748956,-93.38082959,0.23,0.54,0.13,0.17,0.27,0.36,0.43 2011-03-18 15:15:14,83.36350183,-93.413108986,0.19,0.60,0.09,0.13,0.23,0.37,0.50 2011-03-18 15:16:25,83.453255897,-93.445574018,0.18,0.63,0.10,0.13,0.21,0.33,0.44 2011-03-18 15:17:36,83.543004523,-93.479506378,0.19,0.52,0.08,0.13,0.24,0.34,0.43 2011-03-18 15:18:47,83.632752219,-93.514024174,0.17,0.57,0.09,0.12,0.21,0.31,0.44 2011-03-18 15:19:58,83.722497843,-93.549082243,0.17,0.52,0.09,0.12,0.21,0.30,0.40 2011-03-18 15:21:09,83.812227815,-93.588444197,0.19,0.49,0.10,0.14,0.22,0.31,0.36 2011-03-18 15:22:20,83.901967699,-93.626332602,0.24,0.84,0.11,0.15,0.28,0.46,0.73 2011-03-18 15:23:31,83.991704439,-93.665366654,0.22,0.57,0.09,0.15,0.28,0.41,0.50 2011-03-18 15:24:43,84.081432024,-93.706799544,0.19,0.79,0.09,0.13,0.23,0.33,0.56 2011-03-18 15:25:54,84.171174474,-93.745670424,0.19,0.47,0.10,0.15,0.22,0.29,0.33 2011-03-18 15:27:05,84.260894489,-93.789999646,0.19,0.49,0.08,0.13,0.24,0.33,0.39 2011-03-18 15:28:16,84.350660922,-93.825438909,0.20,0.47,0.11,0.15,0.24,0.33,0.41 2011-03-18 15:29:27,84.440560498,-93.833517255,0.22,0.64,0.11,0.15,0.28,0.41,0.54 2011-03-18 15:30:39,84.530271698,-93.881617912,0.21,0.65,0.10,0.15,0.25,0.39,0.55 2011-03-18 15:31:51,84.61977808,-93.973623255,0.22,0.73,0.08,0.15,0.26,0.41,0.51 2011-03-18 15:33:03,84.709477258,-94.02576772,0.19,0.84,0.09,0.12,0.24,0.36,0.52 2011-03-18 15:34:14,84.799169938,-94.08042621,0.24,0.70,0.11,0.18,0.29,0.42,0.51 2011-03-18 15:35:26,84.88882312,-94.144007618,0.24,0.62,0.14,0.18,0.28,0.38,0.44 2011-03-18 15:36:38,84.97858331,-94.186648813,0.25,0.61,0.12,0.18,0.30,0.42,0.50 2011-03-18 15:37:50,85.068260625,-94.247180025,0.17,0.46,0.08,0.12,0.21,0.32,0.41 2011-03-18 15:39:01,85.15795044,-94.30628422,0.19,0.44,0.12,0.15,0.23,0.31,0.36 2011-03-18 15:40:13,85.247627356,-94.369388336,0.20,0.46,0.10,0.15,0.24,0.32,0.41 2011-03-18 15:41:24,85.337304169,-94.433562781,0.19,0.50,0.10,0.15,0.22,0.31,0.42 2011-03-18 15:42:36,85.426970358,-94.501161516,0.18,0.44,0.11,0.14,0.21,0.29,0.37 2011-03-18 15:43:48,85.516611055,-94.575279235,0.29,0.93,0.17,0.23,0.34,0.49,0.71 2011-03-18 15:45:00,85.606474095,-94.642264075,0.19,0.56,0.09,0.14,0.24,0.31,0.36 2011-03-18 15:46:17,85.7020859357,-94.7262180538,0.22,0.82,0.11,0.16,0.28,0.34,0.41 2011-03-18 15:47:21,85.7826516289,-94.7958336863,0.19,0.66,0.11,0.15,0.23,0.32,0.44 2011-03-18 15:54:59,85.711072384,-93.3877082295,0.21,0.52,0.11,0.15,0.25,0.35,0.43 2011-03-18 15:56:19,85.626044018,-92.955055156,0.17,0.44,0.10,0.13,0.20,0.29,0.37 2011-03-18 15:57:39,85.540703616,-92.543820992,0.19,0.58,0.10,0.14,0.22,0.33,0.45 2011-03-18 15:58:58,85.455489547,-92.148419287,0.19,0.67,0.12,0.15,0.23,0.31,0.45 2011-03-18 16:00:16,85.37098378,-91.7671042115,0.17,0.57,0.06,0.12,0.21,0.33,0.41 2011-03-18 16:01:35,85.286327707,-91.398069807,0.16,0.41,0.09,0.12,0.18,0.26,0.34 2011-03-18 16:02:53,85.201234203,-91.050803445,0.17,0.42,0.09,0.14,0.21,0.27,0.33 2011-03-18 16:04:12,85.116166003,-90.708814026,0.19,0.50,0.10,0.13,0.22,0.34,0.44 2011-03-18 16:05:30,85.030886763,-90.380148111,0.22,0.72,0.08,0.15,0.28,0.39,0.54 2011-03-18 16:06:49,84.945419419,-90.063522553,0.18,0.61,0.11,0.14,0.22,0.29,0.35 2011-03-18 16:08:07,84.859841974,-89.756055247,0.22,0.50,0.12,0.16,0.26,0.37,0.44 2011-03-18 16:09:26,84.774107617,-89.459164,0.25,0.74,0.09,0.15,0.34,0.45,0.56 2011-03-18 16:10:46,84.688239412,-89.17181314,0.20,0.61,0.10,0.13,0.26,0.37,0.45 2011-03-18 16:12:05,84.60223092,-88.893971476,0.22,0.71,0.12,0.16,0.26,0.35,0.43 2011-03-18 16:13:24,84.516111857,-88.62440749,0.20,0.61,0.11,0.15,0.24,0.34,0.42 2011-03-18 16:14:43,84.42987878,-88.363064444,0.18,0.40,0.09,0.13,0.22,0.28,0.33 2011-03-18 16:16:02,84.343521163,-88.110138424,0.20,0.44,0.09,0.15,0.25,0.33,0.39 2011-03-18 16:17:21,84.257072391,-87.864277345,0.22,0.62,0.12,0.16,0.25,0.38,0.49 2011-03-18 16:18:40,84.17050462,-87.626254018,0.19,0.48,0.11,0.14,0.21,0.32,0.39 2011-03-18 16:19:59,84.083841332,-87.395135788,0.23,0.56,0.12,0.17,0.27,0.38,0.48 2011-03-18 16:21:18,83.997090219,-87.170499599,0.19,0.48,0.10,0.14,0.23,0.33,0.41 2011-03-18 16:22:37,83.910250792,-86.952234302,0.21,0.57,0.12,0.16,0.24,0.36,0.46 2011-03-18 16:23:56,83.823431307,-86.736327235,0.22,0.74,0.12,0.17,0.27,0.36,0.47 2011-03-18 16:25:15,83.736345577,-86.53288318,0.20,0.47,0.11,0.14,0.25,0.33,0.43 2011-03-18 16:26:34,83.649229783,-86.333334005,0.23,1.00,0.11,0.15,0.26,0.48,0.62 2011-03-18 16:27:53,83.562079031,-86.1377584128,0.24,0.59,0.13,0.17,0.30,0.44,0.55 2011-03-18 16:29:12,83.474844341,-85.947812261,0.23,0.74,0.12,0.16,0.27,0.42,0.62 2011-03-18 16:30:31,83.387555577,-85.762353267,0.25,0.72,0.10,0.16,0.30,0.55,0.66 2011-03-18 16:31:49,83.300207172,-85.581442103,0.19,0.51,0.11,0.14,0.23,0.31,0.41 2011-03-18 16:33:08,83.212763084,-85.40622839,0.21,0.60,0.10,0.14,0.27,0.38,0.47 2011-03-18 16:34:26,83.124756197,-85.2348703232,0.26,0.62,0.11,0.19,0.33,0.42,0.51 2011-03-18 16:35:16,83.0695925313,-85.1283427578,0.26,0.55,0.15,0.21,0.30,0.40,0.44