# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20120327.10km.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 2012-03-27 12:26:41,83.767255261,-59.424495956,0.25,0.86,0.13,0.19,0.30,0.41,0.48 2012-03-27 12:27:57,83.835812594,-58.886862431,0.24,0.74,0.11,0.15,0.31,0.45,0.54 2012-03-27 12:29:14,83.90382804,-58.337325972,0.21,0.62,0.11,0.15,0.26,0.37,0.46 2012-03-27 12:30:32,83.97124397,-57.775168737,0.22,0.46,0.13,0.17,0.28,0.36,0.41 2012-03-27 12:31:51,84.038076455,-57.20046234,0.24,0.81,0.13,0.18,0.28,0.37,0.52 2012-03-27 12:33:09,84.104373798,-56.613592019,0.19,0.42,0.12,0.15,0.22,0.32,0.38 2012-03-27 12:34:27,84.170050877,-56.013571927,0.20,0.84,0.08,0.15,0.24,0.33,0.42 2012-03-27 12:35:43,84.235068457,-55.399893561,0.23,0.61,0.07,0.17,0.29,0.40,0.47 2012-03-27 12:36:59,84.299422031,-54.772419044,0.22,0.77,0.10,0.15,0.28,0.41,0.61 2012-03-27 12:38:15,84.363063432,-54.130569422,0.20,0.53,0.10,0.14,0.24,0.33,0.41 2012-03-27 12:39:30,84.426037073,-53.474664233,0.22,0.55,0.12,0.17,0.26,0.38,0.47 2012-03-27 12:40:45,84.488325788,-52.804497509,0.19,0.60,0.09,0.13,0.22,0.32,0.43 2012-03-27 12:42:01,84.549822391,-52.118908512,0.25,0.71,0.11,0.16,0.32,0.49,0.59 2012-03-27 12:43:18,84.6105412708,-51.4179752485,0.19,0.43,0.09,0.14,0.23,0.31,0.37 2012-03-27 12:44:36,84.670411563,-50.700957902,0.17,0.45,0.08,0.12,0.20,0.32,0.37 2012-03-27 12:45:54,84.729446906,-49.967980466,0.18,0.60,0.04,0.12,0.23,0.36,0.51 2012-03-27 12:47:12,84.787669453,-49.219112801,0.22,0.56,0.10,0.15,0.29,0.38,0.46 2012-03-27 12:48:29,84.845003997,-48.453665098,0.17,0.69,0.09,0.12,0.21,0.31,0.37 2012-03-27 12:49:47,84.901421753,-47.671360842,0.18,0.58,0.09,0.13,0.21,0.32,0.41 2012-03-27 12:51:04,84.956845727,-46.871512213,0.18,0.61,0.05,0.13,0.21,0.34,0.52 2012-03-27 12:52:21,85.01129132,-46.054275253,0.23,0.50,0.11,0.16,0.28,0.38,0.46 2012-03-27 12:53:37,85.064706572,-45.219222376,0.20,0.58,0.11,0.16,0.24,0.35,0.44 2012-03-27 12:54:54,85.117151075,-44.366923259,0.21,0.62,0.10,0.16,0.25,0.35,0.48 2012-03-27 12:56:12,85.168457021,-43.496035677,0.24,0.61,0.14,0.19,0.29,0.37,0.42 2012-03-27 12:57:29,85.218644642,-42.606843381,0.24,0.90,0.08,0.13,0.33,0.47,0.63 2012-03-27 12:58:47,85.26763304,-41.698817616,0.25,0.90,0.10,0.18,0.31,0.43,0.65 2012-03-27 13:00:04,85.315464253,-40.77245608,0.20,0.43,0.10,0.15,0.25,0.33,0.37 2012-03-27 13:01:21,85.362118281,-39.827773447,0.20,0.58,0.09,0.15,0.25,0.33,0.46 2012-03-27 13:02:37,85.4074721194,-38.8640658362,0.21,0.80,0.08,0.15,0.25,0.34,0.48 2012-03-27 13:03:54,85.451565022,-37.881868159,0.25,0.78,0.15,0.19,0.29,0.39,0.55 2012-03-27 13:05:11,85.494240434,-36.88037302,0.20,0.49,0.10,0.15,0.24,0.34,0.39 2012-03-27 13:06:27,85.535559387,-35.860331238,0.29,0.65,0.13,0.19,0.37,0.52,0.60 2012-03-27 13:07:44,85.575421635,-34.82147852,0.22,0.66,0.11,0.15,0.27,0.39,0.50 2012-03-27 13:09:01,85.613915228,-33.764775508,0.25,0.54,0.10,0.18,0.31,0.42,0.46 2012-03-27 13:10:17,85.650906579,-32.689831341,0.23,0.56,0.08,0.17,0.30,0.40,0.45 2012-03-27 13:11:34,85.686314388,-31.596683132,0.25,0.48,0.12,0.19,0.32,0.39,0.44 2012-03-27 13:12:51,85.7201224,-30.485823191,0.25,0.61,0.09,0.18,0.32,0.45,0.50 2012-03-27 13:14:07,85.752358212,-29.35802666,0.24,0.57,0.13,0.18,0.29,0.39,0.46 2012-03-27 13:15:23,85.782987158,-28.213738877,0.23,0.57,0.12,0.17,0.28,0.37,0.48 2012-03-27 13:16:39,85.811911721,-27.053191529,0.19,0.49,0.08,0.12,0.25,0.33,0.40 2012-03-27 13:17:55,85.839107674,-25.877056995,0.18,0.67,0.09,0.12,0.21,0.31,0.43 2012-03-27 13:19:12,85.864566612,-24.686097576,0.24,0.59,0.08,0.18,0.30,0.39,0.49 2012-03-27 13:20:29,85.888206164,-23.480873467,0.22,0.73,0.12,0.16,0.27,0.38,0.49 2012-03-27 13:21:46,85.910013274,-22.262283542,0.15,0.46,0.08,0.11,0.17,0.27,0.35 2012-03-27 13:23:03,85.930050771,-21.031509726,0.20,0.55,0.13,0.16,0.22,0.31,0.42 2012-03-27 13:24:21,85.948210933,-19.789203489,0.18,0.60,0.11,0.12,0.21,0.32,0.42 2012-03-27 13:25:38,85.964469328,-18.536338608,0.17,0.37,0.10,0.12,0.20,0.26,0.30 2012-03-27 13:26:56,85.978753614,-17.27387689,0.18,0.38,0.10,0.13,0.21,0.28,0.32 2012-03-27 13:28:15,85.991091509,-16.003080057,0.18,0.50,0.10,0.13,0.21,0.29,0.35 2012-03-27 13:29:33,86.001507249,-14.725161044,0.19,0.38,0.10,0.15,0.23,0.29,0.34 2012-03-27 13:30:51,86.009979054,-13.441286572,0.20,0.47,0.11,0.15,0.25,0.32,0.38 2012-03-27 13:32:10,86.016439102,-12.152584857,0.22,0.58,0.11,0.16,0.27,0.36,0.46 2012-03-27 13:33:28,86.0208868497,-10.8599483796,0.21,0.44,0.10,0.15,0.26,0.34,0.41 2012-03-27 13:36:08,86.0235190952,-8.19010805126,0.22,0.62,0.09,0.14,0.28,0.37,0.47 2012-03-27 13:40:03,86.0125555614,-4.47750781316,0.16,0.70,0.08,0.11,0.18,0.35,0.44 2012-03-27 13:41:50,86.002877044,-2.730887353,0.19,0.54,0.10,0.14,0.23,0.35,0.45 2012-03-27 13:43:06,85.9928073867,-1.46536664547,0.17,0.48,0.09,0.12,0.19,0.32,0.41 2012-03-27 13:54:57,85.7799431901,-5.64178470222,0.15,0.43,0.09,0.11,0.18,0.27,0.34 2012-03-27 13:57:53,85.6599933215,-7.70067037278,0.17,0.67,0.08,0.12,0.20,0.32,0.46 2012-03-27 14:03:17,85.4322788879,-11.2858888606,0.17,0.69,0.09,0.12,0.18,0.32,0.52 2012-03-27 14:04:51,85.3605774524,-12.2769320467,0.22,0.60,0.11,0.16,0.27,0.39,0.49 2012-03-27 14:06:15,85.296977603,-13.109952556,0.20,0.48,0.11,0.15,0.25,0.33,0.40 2012-03-27 14:07:34,85.234742837,-13.894892633,0.18,0.53,0.10,0.12,0.21,0.29,0.35 2012-03-27 14:08:52,85.171615041,-14.659191369,0.19,0.45,0.11,0.14,0.22,0.32,0.38 2012-03-27 14:10:08,85.107721337,-15.404484665,0.23,0.54,0.14,0.18,0.28,0.36,0.41 2012-03-27 14:11:24,85.0429957,-16.130146286,0.24,0.71,0.13,0.18,0.28,0.40,0.57 2012-03-27 14:12:41,84.977476328,-16.83675364,0.18,0.52,0.09,0.13,0.23,0.31,0.37 2012-03-27 14:13:59,84.911218219,-17.525124532,0.20,0.59,0.09,0.15,0.24,0.33,0.43 2012-03-27 14:15:16,84.844265684,-18.195966366,0.23,0.64,0.10,0.16,0.27,0.41,0.54 2012-03-27 14:16:34,84.776647617,-18.849809054,0.20,0.52,0.10,0.14,0.26,0.35,0.41 2012-03-27 14:17:52,84.708353211,-19.486702801,0.23,0.52,0.10,0.16,0.29,0.39,0.44 2012-03-27 14:19:11,84.639405159,-20.107074517,0.27,0.62,0.12,0.20,0.32,0.45,0.53 2012-03-27 14:20:30,84.569879824,-20.712077962,0.29,0.58,0.16,0.22,0.35,0.45,0.51 2012-03-27 14:21:48,84.499760882,-21.30166961,0.28,0.67,0.13,0.21,0.35,0.47,0.57 2012-03-27 14:23:07,84.429067677,-21.876258492,0.23,0.71,0.11,0.17,0.29,0.43,0.50 2012-03-27 14:24:26,84.357822276,-22.436333147,0.24,0.71,0.13,0.18,0.29,0.41,0.55 2012-03-27 14:25:46,84.286068765,-22.982626367,0.23,0.49,0.13,0.18,0.28,0.37,0.44 2012-03-27 14:27:06,84.213783551,-23.514975946,0.23,0.67,0.12,0.18,0.28,0.37,0.48 2012-03-27 14:28:08,84.1585548269,-23.9113862827,0.27,0.61,0.11,0.19,0.33,0.48,0.56 2012-03-27 14:33:58,84.2593593278,-25.2249125363,0.16,0.51,0.06,0.12,0.21,0.29,0.40 2012-03-27 14:35:23,84.3511319859,-25.3116482899,0.16,0.47,0.05,0.10,0.21,0.31,0.40 2012-03-27 14:36:47,84.441567141,-25.398239702,0.19,0.53,0.11,0.14,0.23,0.32,0.39 2012-03-27 14:38:09,84.530997984,-25.486436078,0.22,0.67,0.10,0.16,0.27,0.41,0.54 2012-03-27 14:39:32,84.62041665,-25.577414127,0.24,0.75,0.12,0.17,0.30,0.41,0.49 2012-03-27 14:40:54,84.709821612,-25.671407616,0.20,0.56,0.04,0.14,0.27,0.35,0.46 2012-03-27 14:42:15,84.799214011,-25.76835021,0.22,0.67,0.12,0.17,0.27,0.34,0.41 2012-03-27 14:43:36,84.888588544,-25.869054219,0.21,0.67,0.11,0.15,0.25,0.36,0.48 2012-03-27 14:44:58,84.977947547,-25.973245113,0.24,0.69,0.12,0.18,0.29,0.41,0.50 2012-03-27 14:46:20,85.067286364,-26.081509866,0.23,0.58,0.06,0.18,0.29,0.38,0.49 2012-03-27 14:47:44,85.156609912,-26.193395304,0.23,0.73,0.11,0.16,0.28,0.42,0.52 2012-03-27 14:49:07,85.245914455,-26.309454077,0.20,0.58,0.05,0.13,0.26,0.37,0.48 2012-03-27 14:50:30,85.335202141,-26.429689562,0.24,0.70,0.11,0.16,0.29,0.40,0.49 2012-03-27 14:51:51,85.424466214,-26.554838771,0.23,0.67,0.10,0.15,0.29,0.45,0.55 2012-03-27 14:53:13,85.513706531,-26.685060245,0.20,0.54,0.09,0.13,0.26,0.37,0.42 2012-03-27 14:54:35,85.602921971,-26.820570095,0.25,0.74,0.11,0.18,0.31,0.42,0.48 2012-03-27 14:55:57,85.692112405,-26.961666072,0.19,0.65,0.09,0.12,0.23,0.34,0.49 2012-03-27 14:57:20,85.781278336,-27.108502474,0.20,0.52,0.10,0.15,0.24,0.33,0.39 2012-03-27 14:58:42,85.870409646,-27.26228465,0.19,0.49,0.07,0.13,0.23,0.34,0.44 2012-03-27 15:00:04,85.959515581,-27.422204441,0.23,0.63,0.12,0.17,0.28,0.38,0.49 2012-03-27 15:01:26,86.048583578,-27.589807691,0.20,0.57,0.10,0.15,0.24,0.32,0.49 2012-03-27 15:02:48,86.137619753,-27.764821268,0.19,0.51,0.09,0.14,0.23,0.33,0.45 2012-03-27 15:04:10,86.226619224,-27.948046545,0.16,0.48,0.07,0.10,0.20,0.29,0.35 2012-03-27 15:05:32,86.315577512,-28.14016048,0.22,0.52,0.10,0.16,0.26,0.36,0.43 2012-03-27 15:06:53,86.404490722,-28.341924853,0.23,0.58,0.12,0.18,0.27,0.34,0.45 2012-03-27 15:08:15,86.493356027,-28.553886925,0.17,0.43,0.10,0.12,0.21,0.29,0.35 2012-03-27 15:09:36,86.582174734,-28.776592773,0.17,0.47,0.08,0.11,0.21,0.31,0.40 2012-03-27 15:10:57,86.670938145,-29.011381149,0.23,0.71,0.13,0.17,0.26,0.41,0.53 2012-03-27 15:12:19,86.759645274,-29.258717099,0.23,0.58,0.10,0.15,0.29,0.38,0.48 2012-03-27 15:13:26,86.8332309439,-29.4735138939,0.17,0.56,0.09,0.12,0.20,0.31,0.41 2012-03-27 15:18:23,86.885973167,-33.569390647,0.18,0.63,0.10,0.13,0.21,0.31,0.42 2012-03-27 15:19:47,86.835421933,-34.97558755,0.22,0.51,0.12,0.15,0.27,0.35,0.41 2012-03-27 15:21:11,86.783215389,-36.329986382,0.19,0.47,0.10,0.13,0.23,0.33,0.41 2012-03-27 15:22:35,86.73011668,-37.614319317,0.17,0.58,0.09,0.12,0.21,0.27,0.35 2012-03-27 15:23:59,86.675698513,-38.857104108,0.16,0.65,0.08,0.11,0.19,0.29,0.36 2012-03-27 15:25:22,86.61995629,-40.061937152,0.18,0.48,0.09,0.12,0.21,0.32,0.39 2012-03-27 15:26:46,86.562599563,-41.224776233,0.18,0.53,0.09,0.13,0.21,0.30,0.39 2012-03-27 15:28:09,86.503882595,-42.349122908,0.15,0.47,0.08,0.10,0.18,0.25,0.32 2012-03-27 15:29:32,86.44387377,-43.436095537,0.18,0.69,0.08,0.13,0.21,0.33,0.44 2012-03-27 15:30:55,86.382598704,-44.486191719,0.20,0.53,0.10,0.13,0.25,0.38,0.46 2012-03-27 15:32:17,86.320082537,-45.499947245,0.17,0.52,0.09,0.12,0.20,0.31,0.38 2012-03-27 15:33:40,86.256683731,-46.4828737,0.20,0.53,0.09,0.14,0.24,0.37,0.43 2012-03-27 15:35:03,86.191930838,-47.432160448,0.20,0.50,0.11,0.15,0.24,0.35,0.44 2012-03-27 15:36:25,86.126062242,-48.35180525,0.21,0.51,0.11,0.16,0.26,0.35,0.41 2012-03-27 15:37:30,86.0738930977,-49.0488557282,0.22,0.42,0.13,0.18,0.27,0.33,0.37 2012-03-27 15:40:43,85.892376245,-50.529330491,0.23,0.64,0.10,0.17,0.28,0.40,0.49 2012-03-27 15:42:04,85.806882141,-50.928417148,0.26,0.62,0.15,0.20,0.31,0.43,0.48 2012-03-27 15:43:24,85.721599323,-51.310572517,0.20,0.43,0.11,0.14,0.24,0.31,0.36 2012-03-27 15:44:45,85.636194472,-51.680243596,0.23,0.55,0.13,0.18,0.26,0.37,0.46 2012-03-27 15:46:06,85.550614196,-52.035660029,0.24,0.58,0.15,0.19,0.28,0.41,0.48 2012-03-27 15:47:27,85.46484019,-52.376413875,0.22,0.65,0.12,0.16,0.25,0.36,0.50 2012-03-27 15:48:49,85.378900131,-52.70410074,0.21,0.45,0.12,0.17,0.26,0.34,0.40 2012-03-27 15:50:10,85.292863069,-53.021810222,0.21,0.50,0.12,0.16,0.24,0.34,0.43 2012-03-27 15:51:31,85.206651068,-53.326633469,0.23,0.56,0.12,0.17,0.26,0.41,0.53 2012-03-27 15:52:52,85.120319431,-53.621114718,0.18,0.61,0.05,0.10,0.23,0.35,0.47 2012-03-27 15:54:13,85.033823748,-53.903721267,0.24,0.54,0.14,0.18,0.28,0.38,0.44 2012-03-27 15:55:34,84.947258409,-54.178621637,0.25,0.55,0.12,0.18,0.31,0.40,0.48 2012-03-27 15:56:56,84.860578579,-54.444165033,0.20,0.63,0.09,0.16,0.24,0.35,0.43 2012-03-27 15:58:19,84.773776745,-54.700246365,0.25,0.57,0.13,0.18,0.30,0.42,0.50 2012-03-27 15:59:42,84.686900679,-54.949031081,0.21,0.68,0.11,0.16,0.24,0.36,0.44 2012-03-27 16:01:06,84.599900626,-55.188713477,0.26,1.03,0.14,0.19,0.30,0.45,0.82 2012-03-27 16:02:31,84.512817154,-55.421144509,0.22,0.66,0.10,0.15,0.27,0.39,0.46 2012-03-27 16:03:57,84.425649071,-55.646429531,0.19,0.51,0.10,0.13,0.23,0.32,0.41 2012-03-27 16:05:22,84.338400302,-55.864873999,0.21,0.77,0.07,0.15,0.27,0.36,0.43 2012-03-27 16:06:47,84.251051701,-56.075822934,0.21,0.56,0.10,0.14,0.26,0.38,0.48 2012-03-27 16:08:11,84.163654338,-56.281632611,0.22,0.57,0.10,0.15,0.28,0.40,0.46 2012-03-27 16:09:36,84.076174446,-56.48095599,0.21,0.70,0.12,0.16,0.25,0.35,0.53 2012-03-27 16:11:00,83.988611607,-56.673907794,0.20,0.57,0.09,0.14,0.25,0.35,0.45 2012-03-27 16:12:24,83.901019807,-56.862863625,0.19,0.54,0.08,0.14,0.23,0.33,0.43 2012-03-27 16:13:48,83.813339439,-57.0455039408,0.25,0.80,0.13,0.19,0.28,0.44,0.57 2012-03-27 16:15:11,83.725596994,-57.222980878,0.25,0.83,0.11,0.19,0.28,0.41,0.58 2012-03-27 16:16:33,83.637800143,-57.395722716,0.31,0.85,0.12,0.19,0.37,0.64,0.80 2012-03-27 16:17:56,83.549951284,-57.563926026,0.25,0.73,0.10,0.17,0.32,0.45,0.57 2012-03-27 16:19:18,83.462046386,-57.727505698,0.31,0.77,0.13,0.21,0.39,0.58,0.69 2012-03-27 16:20:40,83.374087819,-57.886705124,0.24,0.56,0.11,0.16,0.29,0.42,0.52 2012-03-27 16:22:03,83.28608307,-58.041884698,0.18,0.80,0.09,0.13,0.22,0.34,0.50 2012-03-27 16:23:25,83.198024312,-58.192786504,0.21,0.55,0.09,0.14,0.25,0.40,0.48 2012-03-27 16:24:48,83.109925962,-58.340085425,0.29,0.75,0.14,0.20,0.35,0.48,0.58 2012-03-27 16:26:12,83.021783025,-58.483636502,0.26,0.69,0.12,0.17,0.32,0.48,0.60 2012-03-27 16:27:35,82.933596032,-58.623599617,0.20,0.58,0.07,0.10,0.28,0.48,0.54 2012-03-27 16:29:00,82.845364586,-58.75995861,0.22,0.53,0.09,0.15,0.27,0.38,0.48 2012-03-27 16:30:25,82.757100194,-58.893261847,0.19,0.64,0.08,0.10,0.25,0.39,0.51 2012-03-27 16:31:51,82.668801303,-59.023384964,0.16,0.43,0.06,0.10,0.21,0.30,0.37 2012-03-27 16:33:06,82.5922489932,-59.1334522927,0.19,0.58,0.07,0.12,0.23,0.35,0.51