# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20100420.10km.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 2010-04-20 14:45:06,86.563585813,93.368125009,0.17,0.45,0.11,0.14,0.19,0.24,0.31 2010-04-20 14:46:16,86.635780687,94.269496788,0.17,0.37,0.11,0.14,0.20,0.26,0.32 2010-04-20 14:47:25,86.707151321,95.210265227,0.17,0.39,0.10,0.14,0.20,0.25,0.32 2010-04-20 14:48:52,86.7958566497,96.4570316544,0.15,0.52,0.05,0.10,0.18,0.27,0.44 2010-04-20 14:51:04,86.926729868,98.469550627,0.21,0.54,0.13,0.16,0.24,0.31,0.40 2010-04-20 14:52:14,86.993869391,99.595153307,0.23,0.47,0.13,0.17,0.28,0.36,0.41 2010-04-20 14:53:24,87.059791964,100.771814469,0.21,0.43,0.12,0.17,0.25,0.31,0.38 2010-04-20 14:54:35,87.1244292299,102.001666453,0.23,0.51,0.13,0.18,0.26,0.33,0.43 2010-04-20 14:55:46,87.187662508,103.287834182,0.19,0.57,0.12,0.14,0.21,0.34,0.44 2010-04-20 14:56:56,87.249462827,104.631519072,0.20,0.40,0.12,0.16,0.23,0.30,0.36 2010-04-20 14:58:07,87.309650006,106.036735001,0.19,0.45,0.10,0.14,0.23,0.31,0.36 2010-04-20 14:59:17,87.3682805025,107.502876157,0.17,0.37,0.08,0.11,0.21,0.29,0.35 2010-04-20 15:00:27,87.425073711,109.035440649,0.20,0.42,0.11,0.15,0.25,0.33,0.39 2010-04-20 15:01:36,87.479954552,110.635679046,0.20,0.41,0.11,0.15,0.23,0.33,0.38 2010-04-20 15:02:45,87.532815783,112.305338643,0.20,0.48,0.12,0.15,0.23,0.32,0.40 2010-04-20 15:03:55,87.583513406,114.048580251,0.19,0.45,0.12,0.16,0.22,0.28,0.31 2010-04-20 15:05:04,87.631818762,115.863202538,0.20,0.42,0.12,0.17,0.23,0.29,0.34 2010-04-20 15:06:13,87.6777011443,117.750692463,0.21,0.51,0.12,0.16,0.25,0.34,0.41 2010-04-20 15:07:22,87.721092612,119.710287158,0.17,0.83,0.11,0.13,0.19,0.26,0.34 2010-04-20 15:08:32,87.7616277244,121.744565474,0.20,0.39,0.11,0.15,0.24,0.31,0.35 2010-04-20 15:09:41,87.799303698,123.850367418,0.22,0.53,0.12,0.18,0.25,0.32,0.39 2010-04-20 15:10:51,87.833890161,126.026613175,0.17,0.34,0.10,0.12,0.21,0.26,0.31 2010-04-20 15:12:00,87.865278187,128.269881144,0.16,0.40,0.09,0.11,0.19,0.24,0.28 2010-04-20 15:13:10,87.893312485,130.576296094,0.18,0.42,0.12,0.15,0.22,0.28,0.33 2010-04-20 15:14:19,87.917902791,132.940544153,0.20,0.46,0.11,0.15,0.24,0.35,0.39 2010-04-20 15:15:28,87.938918441,135.35672835,0.18,0.46,0.10,0.14,0.21,0.26,0.31 2010-04-20 15:16:37,87.956184012,137.818281163,0.19,0.45,0.13,0.15,0.22,0.28,0.38 2010-04-20 15:17:46,87.96968859,140.316769344,0.19,0.44,0.10,0.14,0.22,0.29,0.36 2010-04-20 15:18:55,87.9792019362,142.84401716,0.24,0.44,0.13,0.19,0.29,0.36,0.39 2010-04-20 15:20:04,87.984807126,145.390107622,0.20,0.51,0.06,0.15,0.26,0.33,0.43 2010-04-20 15:21:12,87.986454115,147.945339675,0.17,0.38,0.11,0.14,0.19,0.25,0.31 2010-04-20 15:22:21,87.984116875,150.499676799,0.18,0.46,0.11,0.15,0.21,0.26,0.32 2010-04-20 15:23:30,87.977846408,153.043217331,0.18,0.40,0.10,0.14,0.21,0.27,0.35 2010-04-20 15:24:40,87.967635229,155.566181514,0.22,0.50,0.14,0.18,0.25,0.32,0.36 2010-04-20 15:25:49,87.95347298,158.058879702,0.18,0.47,0.11,0.14,0.21,0.28,0.35 2010-04-20 15:26:57,87.935529678,160.515460586,0.19,0.40,0.12,0.15,0.22,0.29,0.37 2010-04-20 15:28:06,87.913878157,162.925679033,0.19,0.49,0.10,0.14,0.22,0.30,0.37 2010-04-20 15:29:15,87.888631954,165.279855724,0.22,0.45,0.12,0.16,0.26,0.35,0.39 2010-04-20 15:30:25,87.8600211,167.575897556,0.24,0.54,0.12,0.18,0.29,0.39,0.44 2010-04-20 15:31:35,87.828019137,169.809586467,0.19,0.38,0.11,0.16,0.22,0.27,0.33 2010-04-20 15:32:46,87.792888911,171.973747024,0.21,0.43,0.13,0.16,0.24,0.31,0.36 2010-04-20 15:33:56,87.754720098,174.067348069,0.18,0.33,0.11,0.15,0.21,0.26,0.30 2010-04-20 15:35:07,87.71361132,176.087721551,0.17,0.43,0.10,0.13,0.20,0.27,0.34 2010-04-20 15:36:17,87.66981644,178.035245648,0.23,0.60,0.15,0.18,0.26,0.34,0.40 2010-04-20 15:37:27,87.623466445,16.829419259,0.19,0.37,0.10,0.15,0.23,0.29,0.33 2010-04-20 15:38:38,87.5747321373,-178.289020147,0.17,0.43,0.11,0.14,0.20,0.27,0.31 2010-04-20 15:39:48,87.523700496,-176.559978389,0.18,0.56,0.12,0.15,0.21,0.27,0.33 2010-04-20 15:40:58,87.470518613,-174.901957602,0.22,0.44,0.12,0.16,0.26,0.33,0.38 2010-04-20 15:42:08,87.415313851,-173.31335551,0.21,0.64,0.12,0.16,0.24,0.33,0.43 2010-04-20 15:43:19,87.3581830443,-171.792717168,0.21,0.49,0.13,0.16,0.25,0.36,0.42 2010-04-20 15:44:29,87.299265776,-170.337522779,0.19,0.37,0.10,0.15,0.22,0.28,0.31 2010-04-20 15:45:39,87.238795689,-168.943101439,0.18,0.34,0.10,0.15,0.22,0.27,0.31 2010-04-20 15:46:49,87.176742978,-167.609544194,0.24,0.59,0.14,0.19,0.29,0.38,0.46 2010-04-20 15:47:58,87.113271235,-166.333093208,0.19,0.41,0.12,0.15,0.23,0.29,0.36 2010-04-20 15:49:08,87.048378827,-165.113201587,0.20,0.47,0.12,0.16,0.23,0.32,0.39 2010-04-20 15:50:19,86.9822077068,-163.946280663,0.18,0.38,0.11,0.14,0.21,0.30,0.36 2010-04-20 15:51:29,86.914904603,-162.828435796,0.18,0.52,0.10,0.14,0.20,0.29,0.38 2010-04-20 15:52:40,86.846456525,-161.759186416,0.17,0.50,0.11,0.13,0.19,0.26,0.33 2010-04-20 15:53:51,86.777020955,-160.734292877,0.19,0.38,0.11,0.15,0.21,0.27,0.34 2010-04-20 15:55:01,86.706619936,-159.752453986,0.20,0.47,0.13,0.16,0.23,0.33,0.40 2010-04-20 15:56:12,86.635320504,-158.811311371,0.18,0.48,0.10,0.13,0.22,0.32,0.37 2010-04-20 15:57:14,86.5718986948,-158.018191535,0.17,0.39,0.11,0.14,0.20,0.27,0.32 2010-04-20 16:03:54,86.548777322,-151.030698608,0.20,0.42,0.12,0.15,0.23,0.31,0.37 2010-04-20 16:05:00,86.5872228,-149.674445337,0.23,0.52,0.13,0.17,0.26,0.37,0.45 2010-04-20 16:06:05,86.6237910965,-148.288082837,0.21,0.42,0.13,0.17,0.25,0.31,0.35 2010-04-20 16:07:11,86.658305774,-146.869795169,0.17,0.44,0.09,0.13,0.21,0.28,0.35 2010-04-20 16:08:16,86.690653069,-145.425061984,0.16,0.40,0.08,0.11,0.20,0.29,0.35 2010-04-20 16:09:22,86.72099765,-143.95361985,0.18,0.46,0.11,0.14,0.21,0.29,0.36 2010-04-20 16:10:28,86.74909398,-142.454508479,0.17,0.37,0.10,0.13,0.20,0.27,0.32 2010-04-20 16:11:34,86.774912332,-140.930469766,0.21,0.48,0.11,0.16,0.25,0.34,0.42 2010-04-20 16:12:41,86.798438668,-139.383793305,0.19,0.39,0.10,0.15,0.23,0.28,0.32 2010-04-20 16:13:48,86.819571396,-137.815272244,0.21,0.45,0.12,0.16,0.25,0.31,0.38 2010-04-20 16:14:56,86.83829277,-136.226983681,0.19,0.47,0.11,0.14,0.22,0.30,0.38 2010-04-20 16:16:05,86.854553902,-134.621021683,0.24,0.51,0.11,0.19,0.28,0.36,0.42 2010-04-20 16:17:13,86.868392747,-132.999846876,0.14,0.37,0.07,0.11,0.17,0.22,0.27 2010-04-20 16:18:22,86.879642983,-131.365520462,0.17,0.45,0.10,0.13,0.21,0.29,0.36 2010-04-20 16:19:31,86.888288276,-129.720617531,0.18,0.40,0.09,0.13,0.21,0.31,0.37 2010-04-20 16:20:41,86.894444628,-128.068011013,0.20,0.42,0.12,0.16,0.24,0.32,0.38 2010-04-20 16:21:54,86.8981014615,-126.308442527,0.21,0.48,0.11,0.17,0.24,0.32,0.37 2010-04-20 16:23:08,86.898936627,-124.45776255,0.19,0.40,0.12,0.15,0.23,0.30,0.36 2010-04-20 16:24:15,86.896856741,-122.798183716,0.18,0.54,0.10,0.13,0.21,0.28,0.34 2010-04-20 16:25:23,86.892132768,-121.142318405,0.20,0.49,0.11,0.15,0.23,0.32,0.38 2010-04-20 16:26:31,86.8847476755,-119.484990725,0.21,0.48,0.10,0.17,0.25,0.33,0.38 2010-04-20 16:27:39,86.874932526,-117.842474659,0.18,0.45,0.09,0.13,0.23,0.30,0.40 2010-04-20 16:28:47,86.862567814,-116.213551531,0.17,0.46,0.09,0.14,0.20,0.27,0.34 2010-04-20 16:29:54,86.847535146,-114.594296267,0.18,0.82,0.08,0.12,0.21,0.31,0.48 2010-04-20 16:31:02,86.830097628,-112.984611915,0.21,0.48,0.11,0.16,0.25,0.31,0.41 2010-04-20 16:32:09,86.810205167,-111.405348746,0.21,0.69,0.13,0.16,0.24,0.33,0.43 2010-04-20 16:33:17,86.788000874,-109.846441735,0.19,0.46,0.10,0.14,0.24,0.32,0.38 2010-04-20 16:34:27,86.76292709,-108.279817375,0.20,0.57,0.12,0.15,0.24,0.32,0.47 2010-04-20 16:35:36,86.735899758,-106.76210496,0.19,0.52,0.10,0.13,0.22,0.31,0.39 2010-04-20 16:36:44,86.706765771,-105.276285104,0.21,0.84,0.11,0.16,0.24,0.35,0.50 2010-04-20 16:37:53,86.675330668,-103.812487531,0.22,0.49,0.12,0.18,0.26,0.33,0.42 2010-04-20 16:39:02,86.64175905,-102.37380393,0.15,0.45,0.05,0.07,0.20,0.26,0.32 2010-04-20 16:40:10,86.606267135,-100.972411233,0.20,0.39,0.10,0.14,0.24,0.31,0.34 2010-04-20 16:41:19,86.56881211,-99.600635399,0.17,0.40,0.09,0.12,0.20,0.28,0.36 2010-04-20 16:42:27,86.529080591,-98.2497865577,0.17,0.37,0.09,0.12,0.21,0.28,0.32 2010-04-20 16:43:35,86.487860895,-96.938252703,0.17,0.46,0.10,0.13,0.20,0.27,0.32 2010-04-20 16:44:43,86.44482989,-95.658828944,0.17,0.51,0.08,0.11,0.21,0.31,0.38 2010-04-20 16:45:52,86.399876938,-94.406317098,0.18,0.57,0.10,0.13,0.21,0.30,0.38 2010-04-20 16:47:01,86.353274435,-93.183870049,0.18,0.42,0.09,0.13,0.23,0.30,0.34 2010-04-20 16:48:11,86.305237518,-91.998163548,0.19,0.49,0.10,0.14,0.23,0.29,0.35 2010-04-20 16:49:20,86.255623261,-90.8430611313,0.21,0.42,0.11,0.16,0.26,0.34,0.38 2010-04-20 16:50:31,86.204177143,-89.710472679,0.19,0.47,0.09,0.14,0.25,0.33,0.40 2010-04-20 16:51:42,86.151744026,-88.616150989,0.20,0.48,0.12,0.16,0.24,0.30,0.37 2010-04-20 16:52:54,86.097925319,-87.551852289,0.23,0.60,0.14,0.18,0.27,0.38,0.45 2010-04-20 16:54:04,86.042760913,-86.517259168,0.24,0.45,0.15,0.20,0.27,0.35,0.39 2010-04-20 16:55:14,85.986364719,-85.511163339,0.25,0.63,0.12,0.17,0.32,0.46,0.54 2010-04-20 16:56:24,85.928746286,-84.533481517,0.29,0.51,0.18,0.24,0.34,0.44,0.47 2010-04-20 16:57:33,85.869813884,-83.581471479,0.22,0.47,0.13,0.17,0.25,0.34,0.40 2010-04-20 16:58:41,85.809663136,-82.653925183,0.21,0.52,0.11,0.15,0.24,0.34,0.40 2010-04-20 16:59:49,85.748817727,-81.755949107,0.17,0.41,0.07,0.12,0.21,0.29,0.36 2010-04-20 17:01:00,85.686911472,-80.884115196,0.17,0.49,0.06,0.10,0.22,0.30,0.42 2010-04-20 17:02:11,85.623979983,-80.0379171442,0.21,0.45,0.11,0.16,0.26,0.33,0.37 2010-04-20 17:03:21,85.560175738,-79.21510775,0.18,0.55,0.10,0.14,0.21,0.29,0.39 2010-04-20 17:04:30,85.495480931,-78.415784505,0.23,0.51,0.12,0.17,0.28,0.39,0.45 2010-04-20 17:05:40,85.429918203,-77.638597012,0.25,0.55,0.12,0.19,0.30,0.41,0.49 2010-04-20 17:06:49,85.363530262,-76.88369149,0.20,0.48,0.10,0.14,0.23,0.33,0.39 2010-04-20 17:07:59,85.296383421,-76.15071592,0.19,0.44,0.11,0.14,0.23,0.34,0.40 2010-04-20 17:09:08,85.228501973,-75.438121408,0.19,0.53,0.10,0.14,0.22,0.32,0.41 2010-04-20 17:10:18,85.159849849,-74.745091391,0.19,0.45,0.08,0.14,0.25,0.32,0.38 2010-04-20 17:11:28,85.09058054,-74.071986464,0.20,0.48,0.10,0.14,0.24,0.33,0.38 2010-04-20 17:12:38,85.020657187,-73.417634737,0.19,0.45,0.09,0.14,0.22,0.34,0.40 2010-04-20 17:13:47,84.950086736,-72.781717966,0.19,0.55,0.10,0.14,0.22,0.31,0.41 2010-04-20 17:14:57,84.878926539,-72.16317206,0.22,0.47,0.12,0.17,0.27,0.35,0.42 2010-04-20 17:16:07,84.807202069,-71.561414334,0.22,0.56,0.11,0.16,0.26,0.34,0.40 2010-04-20 17:17:16,84.734862707,-70.9769838958,0.28,0.54,0.13,0.20,0.35,0.43,0.48 2010-04-20 17:18:26,84.662088481,-70.406964968,0.24,1.28,0.12,0.16,0.29,0.44,0.67 2010-04-20 17:19:35,84.588768352,-69.852823045,0.25,0.55,0.13,0.19,0.29,0.40,0.46 2010-04-20 17:20:45,84.514907407,-69.314282247,0.22,0.49,0.12,0.16,0.26,0.35,0.43 2010-04-20 17:21:54,84.4406358648,-68.7891813137,0.24,0.62,0.10,0.16,0.31,0.44,0.53 2010-04-20 17:23:04,84.365914906,-68.277863255,0.20,0.57,0.05,0.06,0.28,0.42,0.49 2010-04-20 17:24:13,84.290758041,-67.779955845,0.23,0.88,0.07,0.15,0.28,0.42,0.62 2010-04-20 17:25:22,84.215141148,-67.295649507,0.22,0.59,0.12,0.16,0.26,0.36,0.48 2010-04-20 17:26:31,84.139166068,-66.823164815,0.28,0.64,0.13,0.21,0.34,0.48,0.56 2010-04-20 17:27:40,84.06278116,-66.36315205,0.26,0.69,0.12,0.18,0.33,0.44,0.50 2010-04-20 17:28:48,83.98600198,-65.915129133,0.22,0.64,0.06,0.15,0.28,0.39,0.55 2010-04-20 17:29:57,83.908798759,-65.477932622,0.20,0.52,0.07,0.14,0.26,0.35,0.44 2010-04-20 17:31:05,83.831353124,-65.051652858,0.26,0.73,0.14,0.20,0.30,0.39,0.47 2010-04-20 17:32:14,83.753582247,-64.635848071,0.19,0.58,0.09,0.13,0.22,0.37,0.49 2010-04-20 17:33:23,83.6754833447,-64.2303999952,0.16,0.52,0.06,0.10,0.21,0.32,0.45 2010-04-20 17:34:32,83.597070956,-63.834926398,0.24,0.66,0.10,0.15,0.29,0.48,0.58 2010-04-20 17:35:42,83.5183270866,-63.4496009501,0.29,0.73,0.15,0.23,0.35,0.43,0.55 2010-04-20 17:36:51,83.439322788,-63.073136004,0.25,0.60,0.12,0.18,0.29,0.42,0.49 2010-04-20 17:38:02,83.360098617,-62.704724654,0.27,0.68,0.13,0.18,0.34,0.49,0.65 2010-04-20 17:39:13,83.280588226,-62.345295531,0.31,0.83,0.09,0.22,0.39,0.54,0.65 2010-04-20 17:40:26,83.200791632,-61.994750188,0.25,0.57,0.15,0.20,0.30,0.42,0.49 2010-04-20 17:41:39,83.120792539,-61.651593104,0.23,0.53,0.07,0.14,0.31,0.42,0.47 2010-04-20 17:42:53,83.040522447,-61.316823334,0.25,0.55,0.12,0.18,0.30,0.42,0.50 2010-04-20 17:44:06,82.960016175,-60.989770549,0.30,0.68,0.12,0.21,0.37,0.50,0.62 2010-04-20 17:45:20,82.8793055242,-60.669804298,0.23,0.70,0.06,0.15,0.30,0.44,0.52 2010-04-20 17:46:33,82.798384016,-60.356903833,0.30,0.81,0.07,0.21,0.39,0.53,0.66 2010-04-20 17:47:46,82.717227925,-60.051378605,0.33,0.76,0.05,0.25,0.42,0.55,0.69 2010-04-20 17:48:26,82.6729471333,-59.8870914889,0.06,0.09,0.04,0.05,0.07,0.09,0.09