# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20180414.10km.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 2018-04-14 19:17:41,69.6613540012,-139.284814428,0.26,0.61,0.09,0.16,0.34,0.45,0.54 2018-04-14 19:19:04,69.7456523449,-139.214363084,0.23,0.47,0.12,0.18,0.28,0.36,0.42 2018-04-14 19:20:27,69.8317523722,-139.142068235,0.17,0.59,0.05,0.10,0.22,0.36,0.42 2018-04-14 19:21:49,69.9184448054,-139.068512376,0.07,0.29,0.03,0.05,0.09,0.15,0.21 2018-04-14 19:23:11,70.005074081,-138.9942987,0.12,0.41,0.05,0.08,0.15,0.21,0.35 2018-04-14 19:24:33,70.0912715589,-138.919866953,0.09,0.40,0.04,0.05,0.12,0.21,0.28 2018-04-14 19:25:54,70.1774244099,-138.844802682,0.11,0.59,0.03,0.05,0.14,0.23,0.32 2018-04-14 19:27:15,70.263541919,-138.76926958,0.15,0.63,0.07,0.10,0.17,0.30,0.39 2018-04-14 19:28:37,70.349624237,-138.693055736,0.10,0.38,0.04,0.06,0.12,0.18,0.23 2018-04-14 19:29:58,70.435672106,-138.616152951,0.10,0.26,0.06,0.07,0.11,0.16,0.20 2018-04-14 19:31:20,70.5216761,-138.538548402,0.13,0.31,0.06,0.09,0.16,0.21,0.25 2018-04-14 19:32:41,70.607654726,-138.460288517,0.10,0.45,0.04,0.05,0.12,0.23,0.31 2018-04-14 19:34:02,70.6935903031,-138.381429532,0.20,0.62,0.04,0.13,0.27,0.38,0.49 2018-04-14 19:35:24,70.7794983181,-138.30182694,0.21,0.77,0.04,0.14,0.28,0.37,0.46 2018-04-14 19:36:46,70.865365226,-138.221461565,0.18,0.51,0.04,0.09,0.25,0.35,0.42 2018-04-14 19:38:08,70.951212256,-138.140554705,0.22,0.53,0.04,0.16,0.27,0.37,0.43 2018-04-14 19:39:30,71.03700791,-138.058797154,0.18,0.42,0.06,0.12,0.22,0.30,0.37 2018-04-14 19:40:52,71.122776413,-137.976403367,0.09,0.38,0.04,0.05,0.12,0.22,0.29 2018-04-14 19:42:14,71.208506458,-137.893289962,0.13,0.58,0.05,0.07,0.15,0.29,0.49 2018-04-14 19:43:36,71.29419983,-137.809445568,0.08,0.23,0.04,0.06,0.09,0.15,0.20 2018-04-14 19:44:57,71.379856975,-137.724866763,0.05,0.12,0.03,0.04,0.05,0.08,0.10 2018-04-14 19:46:19,71.465483903,-137.639606375,0.04,0.08,0.03,0.04,0.05,0.06,0.07 2018-04-14 19:47:41,71.551062875,-137.553522217,0.05,0.10,0.04,0.04,0.05,0.06,0.08 2018-04-14 19:49:03,71.636596823,-137.46658329,0.04,0.09,0.03,0.04,0.05,0.06,0.08 2018-04-14 19:50:25,71.722104979,-137.378916901,0.04,0.12,0.03,0.04,0.05,0.06,0.09 2018-04-14 19:51:48,71.807558366,-137.290489784,0.04,0.09,0.04,0.04,0.04,0.05,0.06 2018-04-14 19:53:10,71.892959641,-137.201087556,0.04,0.05,0.04,0.04,0.04,0.04,0.05 2018-04-14 19:54:33,71.978352157,-137.111165754,0.04,0.05,0.03,0.04,0.04,0.04,0.05 2018-04-14 19:55:56,72.0636674118,-137.020075535,0.04,0.09,0.03,0.03,0.04,0.05,0.06 2018-04-14 19:57:18,72.148979248,-136.928450329,0.09,0.26,0.03,0.06,0.12,0.17,0.24 2018-04-14 19:58:41,72.234209485,-136.835685923,0.03,0.09,0.03,0.03,0.04,0.04,0.06 2018-04-14 20:00:04,72.319435734,-136.742374793,0.06,0.35,0.03,0.03,0.08,0.14,0.23 2018-04-14 20:01:27,72.404603244,-136.647983205,0.09,0.37,0.03,0.03,0.13,0.20,0.27 2018-04-14 20:02:50,72.489720979,-136.552682044,0.11,0.33,0.06,0.08,0.13,0.18,0.22 2018-04-14 20:04:13,72.574801648,-136.456616492,0.15,0.64,0.04,0.06,0.21,0.37,0.53 2018-04-14 20:05:36,72.65982717,-136.359414493,0.17,0.35,0.07,0.13,0.20,0.26,0.30 2018-04-14 20:06:58,72.744830804,-136.261497576,0.13,0.30,0.04,0.08,0.17,0.24,0.27 2018-04-14 20:08:30,72.8389381138,-136.151619972,0.11,0.29,0.03,0.05,0.16,0.21,0.24 2018-04-14 20:09:43,72.914547477,-136.062211689,0.12,0.31,0.06,0.09,0.15,0.21,0.25 2018-04-14 20:11:05,72.999348365,-135.961081265,0.05,0.28,0.03,0.03,0.04,0.15,0.20 2018-04-14 20:12:27,73.084210317,-135.86001758,0.03,0.08,0.03,0.03,0.04,0.05,0.07 2018-04-14 20:13:49,73.168957046,-135.75729401,0.09,0.30,0.03,0.05,0.12,0.15,0.18 2018-04-14 20:15:11,73.2536292373,-135.65344019,0.05,0.25,0.03,0.03,0.06,0.09,0.15 2018-04-14 20:16:33,73.338256135,-135.548622604,0.10,0.39,0.03,0.04,0.14,0.23,0.29 2018-04-14 20:17:55,73.422828164,-135.442724503,0.10,0.35,0.03,0.07,0.13,0.18,0.23 2018-04-14 20:19:17,73.507343689,-135.335754582,0.15,0.36,0.07,0.11,0.18,0.24,0.29 2018-04-14 20:20:38,73.591804423,-135.227719008,0.09,0.46,0.03,0.03,0.14,0.25,0.36 2018-04-14 20:22:00,73.676214406,-135.118634929,0.08,0.32,0.03,0.03,0.13,0.19,0.27 2018-04-14 20:23:21,73.760539849,-135.008480693,0.05,0.26,0.03,0.03,0.05,0.11,0.17 2018-04-14 20:24:42,73.844858948,-134.897118202,0.11,0.24,0.03,0.08,0.14,0.18,0.21 2018-04-14 20:26:03,73.929093443,-134.784649307,0.11,0.31,0.05,0.06,0.14,0.19,0.25 2018-04-14 20:27:24,74.013268801,-134.67105343,0.14,0.35,0.07,0.11,0.17,0.22,0.28 2018-04-14 20:28:45,74.097375411,-134.556222516,0.11,0.30,0.03,0.09,0.14,0.17,0.23 2018-04-14 20:30:06,74.181433287,-134.440350004,0.13,0.51,0.06,0.08,0.16,0.22,0.31 2018-04-14 20:31:26,74.265571068,-134.324722912,0.09,0.33,0.03,0.04,0.12,0.18,0.23 2018-04-14 20:32:46,74.349846899,-134.2097315,0.11,0.33,0.06,0.07,0.14,0.21,0.27 2018-04-14 20:34:06,74.433088714,-134.084171266,0.14,0.34,0.08,0.10,0.16,0.23,0.31 2018-04-14 20:35:26,74.516969911,-133.964039251,0.13,0.34,0.07,0.10,0.15,0.22,0.27 2018-04-14 20:36:46,74.600708652,-133.84188744,0.11,0.27,0.05,0.07,0.15,0.20,0.24 2018-04-14 20:38:06,74.684366063,-133.718328789,0.12,0.31,0.04,0.08,0.16,0.23,0.27 2018-04-14 20:39:25,74.767969503,-133.593554522,0.11,0.25,0.05,0.08,0.13,0.18,0.22 2018-04-14 20:40:44,74.851493834,-133.467358365,0.13,0.41,0.03,0.07,0.18,0.26,0.33 2018-04-14 20:42:03,74.934949912,-133.339817423,0.14,0.42,0.03,0.09,0.19,0.25,0.34 2018-04-14 20:43:22,75.018332546,-133.210875978,0.12,0.34,0.03,0.07,0.16,0.22,0.29 2018-04-14 20:44:41,75.101650659,-133.080636468,0.13,0.38,0.04,0.09,0.17,0.22,0.30 2018-04-14 20:46:00,75.184888011,-132.948877377,0.12,0.40,0.05,0.08,0.14,0.22,0.29 2018-04-14 20:47:20,75.268045361,-132.815620329,0.12,0.35,0.03,0.07,0.15,0.21,0.31 2018-04-14 20:48:39,75.351127333,-132.680902217,0.15,0.34,0.08,0.12,0.18,0.24,0.30 2018-04-14 20:49:58,75.434131069,-132.544704242,0.12,0.37,0.03,0.06,0.16,0.22,0.27 2018-04-14 20:51:17,75.517058298,-132.406971893,0.16,0.34,0.08,0.12,0.19,0.25,0.30 2018-04-14 20:52:37,75.599906441,-132.267691978,0.14,0.43,0.03,0.10,0.17,0.24,0.30 2018-04-14 20:53:56,75.68266226,-132.126768265,0.15,0.35,0.08,0.12,0.18,0.22,0.26 2018-04-14 20:55:15,75.765349988,-131.984396688,0.08,0.27,0.03,0.04,0.13,0.19,0.24 2018-04-14 20:56:34,75.847943966,-131.840333122,0.11,0.47,0.03,0.03,0.17,0.25,0.34 2018-04-14 20:57:53,75.930453875,-131.694628487,0.18,0.40,0.04,0.13,0.23,0.30,0.34 2018-04-14 20:59:12,76.012878722,-131.547275029,0.15,0.58,0.06,0.11,0.19,0.26,0.36 2018-04-14 21:00:31,76.095207413,-131.398139386,0.15,0.37,0.08,0.12,0.19,0.25,0.32 2018-04-14 21:01:50,76.17744834,-131.247289147,0.15,0.49,0.04,0.11,0.18,0.24,0.31 2018-04-14 21:03:08,76.25959601,-131.094662853,0.14,0.42,0.04,0.10,0.19,0.26,0.32 2018-04-14 21:04:27,76.341647502,-130.940262152,0.14,0.35,0.05,0.11,0.18,0.24,0.29 2018-04-14 21:05:47,76.423585456,-130.783905394,0.14,0.36,0.07,0.10,0.18,0.23,0.27 2018-04-14 21:07:06,76.505337153,-130.624738062,0.15,0.42,0.06,0.10,0.19,0.25,0.33 2018-04-14 21:08:25,76.587104542,-130.464902448,0.15,0.54,0.03,0.09,0.20,0.28,0.34 2018-04-14 21:09:44,76.668971036,-130.305110053,0.16,0.56,0.04,0.10,0.20,0.39,0.48 2018-04-14 21:11:03,76.750361522,-130.139755764,0.18,0.50,0.04,0.12,0.23,0.34,0.43 2018-04-14 21:12:21,76.831804886,-129.973838354,0.20,0.57,0.08,0.14,0.25,0.33,0.44 2018-04-14 21:13:39,76.913118468,-129.805755081,0.20,0.53,0.09,0.15,0.24,0.38,0.46 2018-04-14 21:14:58,76.994336181,-129.635667943,0.18,0.44,0.08,0.14,0.22,0.28,0.33 2018-04-14 21:16:16,77.075456428,-129.463682974,0.16,0.49,0.05,0.11,0.19,0.28,0.38 2018-04-14 21:17:35,77.156463463,-129.28952191,0.21,0.51,0.09,0.15,0.26,0.38,0.46 2018-04-14 21:18:53,77.237340394,-129.113059637,0.13,0.29,0.06,0.10,0.16,0.21,0.24 2018-04-14 21:20:12,77.318099971,-128.934400802,0.15,0.63,0.07,0.11,0.18,0.25,0.35 2018-04-14 21:21:31,77.398729365,-128.753580871,0.16,0.39,0.08,0.12,0.20,0.27,0.32 2018-04-14 21:22:50,77.479244174,-128.570426974,0.16,0.40,0.08,0.11,0.20,0.29,0.37 2018-04-14 21:24:09,77.559645343,-128.385020299,0.16,0.41,0.08,0.11,0.19,0.29,0.35 2018-04-14 21:25:27,77.639908093,-128.197148125,0.11,0.46,0.03,0.04,0.16,0.28,0.38 2018-04-14 21:26:46,77.720045432,-128.006916128,0.17,0.47,0.05,0.12,0.21,0.29,0.42 2018-04-14 21:28:04,77.800049879,-127.814211427,0.16,0.56,0.07,0.11,0.20,0.31,0.42 2018-04-14 21:29:23,77.879916925,-127.618989284,0.15,0.51,0.04,0.07,0.20,0.37,0.45 2018-04-14 21:30:42,77.959648151,-127.421235976,0.10,0.42,0.03,0.04,0.16,0.25,0.33 2018-04-14 21:32:00,78.03924572,-127.220983561,0.13,0.55,0.06,0.08,0.16,0.25,0.35 2018-04-14 21:33:19,78.1186486393,-127.017735707,0.09,0.43,0.03,0.04,0.13,0.24,0.35 2018-04-14 21:34:38,78.197951411,-126.812470775,0.18,0.56,0.07,0.12,0.23,0.31,0.40 2018-04-14 21:35:56,78.277099648,-126.603881357,0.23,0.81,0.10,0.15,0.28,0.44,0.68 2018-04-14 21:36:45,78.3266921142,-126.472117374,0.31,0.53,0.16,0.22,0.38,0.48,0.52 2018-04-14 21:50:23,78.136510304,-122.76480798,0.18,0.68,0.07,0.11,0.23,0.35,0.46 2018-04-14 21:51:34,78.04817483,-122.843696291,0.17,0.49,0.04,0.12,0.22,0.27,0.38 2018-04-14 21:52:46,77.959824802,-122.921666883,0.19,0.61,0.08,0.14,0.23,0.31,0.45 2018-04-14 21:53:59,77.871440822,-122.998416381,0.18,0.62,0.09,0.13,0.22,0.33,0.49 2018-04-14 21:55:14,77.783046047,-123.074311549,0.16,0.57,0.06,0.09,0.20,0.32,0.45 2018-04-14 21:56:28,77.694643384,-123.149395985,0.25,0.72,0.11,0.17,0.31,0.46,0.55 2018-04-14 21:57:43,77.606217935,-123.223437235,0.24,0.85,0.09,0.16,0.30,0.42,0.57 2018-04-14 21:58:59,77.517779149,-123.296564731,0.17,0.59,0.07,0.12,0.20,0.29,0.38 2018-04-14 22:00:14,77.429316378,-123.36852787,0.18,0.43,0.07,0.12,0.23,0.32,0.37 2018-04-14 22:01:29,77.34082596,-123.439412699,0.22,1.39,0.08,0.15,0.25,0.37,0.63 2018-04-14 22:02:44,77.252330515,-123.509729849,0.26,1.00,0.10,0.17,0.31,0.52,0.80 2018-04-14 22:04:00,77.163828618,-123.579285126,0.21,0.75,0.10,0.16,0.26,0.35,0.52 2018-04-14 22:05:15,77.075306476,-123.64790311,0.22,0.67,0.10,0.15,0.28,0.39,0.48 2018-04-14 22:06:30,76.986790915,-123.715722754,0.23,0.70,0.09,0.16,0.29,0.39,0.47 2018-04-14 22:07:46,76.898205515,-123.781646156,0.18,0.55,0.06,0.13,0.22,0.30,0.36 2018-04-14 22:09:01,76.809662968,-123.848231383,0.20,0.80,0.03,0.13,0.27,0.38,0.47 2018-04-14 22:10:17,76.721095689,-123.913632085,0.19,0.73,0.03,0.10,0.26,0.40,0.51 2018-04-14 22:11:32,76.6325154987,-123.978326329,0.14,0.55,0.03,0.04,0.22,0.33,0.43 2018-04-14 22:12:47,76.5439213049,-124.042287228,0.15,0.55,0.03,0.06,0.24,0.34,0.43 2018-04-14 22:14:02,76.4552877571,-124.104333856,0.20,0.53,0.07,0.14,0.25,0.34,0.43 2018-04-14 22:15:18,76.3666780537,-124.166765523,0.18,0.55,0.06,0.13,0.23,0.30,0.38 2018-04-14 22:16:33,76.2780528321,-124.228848244,0.20,0.55,0.09,0.14,0.24,0.35,0.44 2018-04-14 22:17:48,76.18940095,-124.289809151,0.20,0.65,0.04,0.10,0.27,0.49,0.58 2018-04-14 22:19:04,76.100736359,-124.35008622,0.08,0.42,0.03,0.03,0.10,0.22,0.31 2018-04-14 22:20:13,76.0193938474,-124.404578773,0.06,0.30,0.03,0.03,0.08,0.13,0.21 2018-04-14 22:21:34,75.923360747,-124.468307784,0.10,0.30,0.03,0.05,0.13,0.20,0.24 2018-04-14 22:22:49,75.834653611,-124.526382109,0.06,0.34,0.03,0.04,0.07,0.13,0.18 2018-04-14 22:24:05,75.745944085,-124.584023507,0.05,0.15,0.03,0.04,0.05,0.09,0.13 2018-04-14 22:25:20,75.6572200928,-124.641032189,0.06,0.19,0.03,0.04,0.06,0.11,0.14 2018-04-14 22:26:36,75.568473866,-124.697316564,0.12,0.41,0.05,0.06,0.16,0.25,0.30 2018-04-14 22:27:52,75.479725055,-124.753015983,0.13,0.51,0.05,0.07,0.16,0.29,0.39 2018-04-14 22:29:08,75.390964516,-124.808065607,0.12,0.36,0.04,0.07,0.16,0.23,0.27 2018-04-14 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23:15:51,72.1060584678,-126.508891889,0.07,0.17,0.04,0.05,0.08,0.10,0.12 2018-04-14 23:20:08,71.9475522112,-127.165904784,0.10,0.28,0.04,0.05,0.14,0.21,0.25 2018-04-14 23:21:29,71.9303109915,-127.450254742,0.10,0.33,0.04,0.05,0.13,0.21,0.27 2018-04-14 23:22:48,71.912575077,-127.734025476,0.12,0.48,0.02,0.03,0.20,0.29,0.35 2018-04-14 23:24:06,71.894454731,-128.017283625,0.14,0.55,0.03,0.09,0.18,0.28,0.37 2018-04-14 23:25:27,71.875898478,-128.299972771,0.13,0.46,0.03,0.09,0.17,0.25,0.33 2018-04-14 23:26:50,71.8569711647,-128.58211793,0.13,0.47,0.03,0.06,0.17,0.27,0.36 2018-04-14 23:28:13,71.8376275486,-128.863691862,0.15,0.72,0.03,0.06,0.21,0.35,0.53 2018-04-14 23:29:36,71.817847973,-129.144660171,0.14,0.57,0.03,0.07,0.20,0.33,0.43 2018-04-14 23:31:01,71.797634345,-129.425008552,0.08,0.23,0.03,0.04,0.11,0.16,0.19 2018-04-14 23:32:27,71.7770754659,-129.7048012,0.16,0.64,0.04,0.08,0.22,0.36,0.48 2018-04-14 23:33:50,71.756081663,-129.98394864,0.15,0.66,0.03,0.08,0.20,0.31,0.40 2018-04-14 23:35:13,71.734741815,-130.262518359,0.19,0.54,0.07,0.13,0.24,0.34,0.41 2018-04-14 23:36:36,71.712973011,-130.540439499,0.23,0.72,0.06,0.15,0.29,0.43,0.58 2018-04-14 23:37:59,71.69078588,-130.817698475,0.15,0.41,0.03,0.06,0.21,0.30,0.34 2018-04-14 23:39:22,71.668213272,-131.094313688,0.10,0.40,0.03,0.04,0.16,0.29,0.34 2018-04-14 23:40:46,71.645228946,-131.370253996,0.29,0.83,0.10,0.22,0.35,0.50,0.59 2018-04-14 23:42:09,71.621863015,-131.64554348,0.14,0.53,0.03,0.07,0.21,0.31,0.41 2018-04-14 23:43:32,71.598099002,-131.920147401,0.17,0.56,0.03,0.08,0.22,0.32,0.39 2018-04-14 23:44:54,71.573919691,-132.194035791,0.13,0.40,0.03,0.04,0.20,0.27,0.34 2018-04-14 23:46:17,71.549391633,-132.467264492,0.11,0.47,0.03,0.04,0.16,0.29,0.37 2018-04-14 23:47:24,71.5290401453,-132.689807231,0.14,0.69,0.05,0.07,0.18,0.34,0.55 2018-04-14 23:56:06,71.1656645117,-134.080796494,0.09,0.50,0.04,0.05,0.11,0.22,0.34