# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20150324.10km.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 2015-03-24 12:23:23,82.563707297,-58.722292595,0.32,0.80,0.16,0.25,0.38,0.49,0.55 2015-03-24 12:24:48,82.624464715,-58.208795564,0.28,0.66,0.13,0.20,0.34,0.46,0.54 2015-03-24 12:26:13,82.684022106,-57.682806899,0.25,0.65,0.12,0.19,0.30,0.41,0.48 2015-03-24 12:27:37,82.742893578,-57.147825837,0.21,0.54,0.10,0.14,0.26,0.37,0.45 2015-03-24 12:29:01,82.801242819,-56.604961882,0.21,0.45,0.11,0.15,0.27,0.33,0.38 2015-03-24 12:30:25,82.858810725,-56.052449883,0.24,0.48,0.14,0.18,0.29,0.37,0.43 2015-03-24 12:31:49,82.915880945,-55.492189588,0.25,0.85,0.09,0.17,0.31,0.47,0.61 2015-03-24 12:33:13,82.972173967,-54.922286875,0.23,0.58,0.10,0.17,0.28,0.37,0.45 2015-03-24 12:34:38,83.027806329,-54.343529851,0.30,0.71,0.14,0.22,0.37,0.51,0.61 2015-03-24 12:36:03,83.082717256,-53.7555343,0.28,0.83,0.12,0.18,0.34,0.54,0.71 2015-03-24 12:37:27,83.136857393,-53.15800337,0.28,0.78,0.12,0.19,0.34,0.54,0.69 2015-03-24 12:38:53,83.190353323,-52.551748037,0.30,0.83,0.14,0.20,0.34,0.55,0.69 2015-03-24 12:40:19,83.24296232,-51.935282767,0.31,0.92,0.14,0.22,0.38,0.52,0.75 2015-03-24 12:41:44,83.294862347,-51.309725376,0.31,0.86,0.15,0.22,0.39,0.51,0.64 2015-03-24 12:43:09,83.345863071,-50.673953577,0.33,0.73,0.18,0.26,0.39,0.52,0.61 2015-03-24 12:44:34,83.396097735,-50.028828923,0.36,0.88,0.11,0.26,0.46,0.58,0.74 2015-03-24 12:45:59,83.445462908,-49.373787517,0.31,0.77,0.16,0.23,0.37,0.50,0.63 2015-03-24 12:50:24,83.5895311607,-47.2440693703,0.33,0.78,0.17,0.25,0.40,0.53,0.69 2015-03-24 12:56:11,83.77333636,-44.389001455,0.33,1.24,0.08,0.24,0.40,0.60,0.87 2015-03-24 12:57:36,83.815126968,-43.653385986,0.30,0.65,0.15,0.24,0.34,0.47,0.61 2015-03-24 12:59:00,83.85585464,-42.907751505,0.30,0.70,0.07,0.15,0.42,0.53,0.62 2015-03-24 13:00:21,83.8939478061,-42.1836141917,0.40,0.79,0.21,0.31,0.47,0.63,0.74 2015-03-24 13:06:40,84.1566902425,-39.7392391055,0.24,0.68,0.11,0.18,0.28,0.37,0.57 2015-03-24 13:08:00,84.245142476,-39.583994232,0.29,0.80,0.10,0.20,0.37,0.53,0.65 2015-03-24 13:09:20,84.333542191,-39.423428098,0.19,0.50,0.11,0.14,0.22,0.31,0.38 2015-03-24 13:10:39,84.42190631,-39.258357852,0.19,0.47,0.11,0.15,0.23,0.30,0.36 2015-03-24 13:11:59,84.510239081,-39.088893482,0.20,0.54,0.11,0.14,0.25,0.31,0.41 2015-03-24 13:13:18,84.598496771,-38.912402822,0.25,0.54,0.14,0.19,0.30,0.39,0.48 2015-03-24 13:14:37,84.686726207,-38.731303133,0.22,0.57,0.13,0.18,0.25,0.32,0.38 2015-03-24 13:15:56,84.774881492,-38.543200022,0.22,0.64,0.11,0.15,0.28,0.38,0.47 2015-03-24 13:17:15,84.862981049,-38.348817286,0.23,0.60,0.12,0.17,0.28,0.39,0.48 2015-03-24 13:20:33,85.0848761529,-37.832182749,0.23,0.49,0.11,0.17,0.28,0.36,0.44 2015-03-24 13:21:52,85.174468817,-37.605868138,0.19,0.50,0.08,0.14,0.23,0.34,0.42 2015-03-24 13:23:10,85.262253325,-37.377119631,0.16,0.39,0.10,0.13,0.19,0.26,0.31 2015-03-24 13:24:28,85.349961541,-37.139852873,0.22,0.57,0.11,0.17,0.26,0.35,0.44 2015-03-24 13:25:45,85.4376034616,-36.8944265982,0.21,0.48,0.11,0.16,0.24,0.33,0.41 2015-03-24 13:27:16,85.5387911832,-36.5948585517,0.19,0.62,0.10,0.14,0.22,0.33,0.42 2015-03-24 13:28:42,85.6362504284,-36.2997020296,0.20,0.55,0.11,0.15,0.24,0.34,0.40 2015-03-24 13:30:00,85.7236282901,-36.020684705,0.22,0.73,0.11,0.14,0.26,0.40,0.52 2015-03-24 13:31:18,85.810869919,-35.730515376,0.20,0.64,0.11,0.15,0.24,0.30,0.37 2015-03-24 13:32:36,85.898002588,-35.428188436,0.18,0.40,0.11,0.14,0.21,0.28,0.34 2015-03-24 13:33:53,85.985000353,-35.111890359,0.21,0.55,0.13,0.17,0.23,0.30,0.37 2015-03-24 13:35:10,86.071874673,-34.781846226,0.18,0.54,0.11,0.14,0.21,0.30,0.39 2015-03-24 13:36:27,86.1586900471,-34.4368609673,0.18,0.41,0.11,0.14,0.21,0.28,0.33 2015-03-24 13:37:46,86.2470938363,-34.0676066032,0.19,0.52,0.12,0.15,0.22,0.31,0.39 2015-03-24 13:39:03,86.333608367,-33.689554209,0.22,0.53,0.14,0.17,0.26,0.34,0.40 2015-03-24 13:40:21,86.420130267,-33.292035613,0.26,0.66,0.14,0.19,0.33,0.43,0.53 2015-03-24 13:41:38,86.506487505,-32.875042419,0.19,0.41,0.12,0.16,0.23,0.29,0.33 2015-03-24 13:42:55,86.592641558,-32.436583474,0.19,0.45,0.13,0.15,0.21,0.28,0.35 2015-03-24 13:43:56,86.6603610399,-32.0746159792,0.18,0.56,0.12,0.15,0.20,0.27,0.34 2015-03-24 13:50:21,86.641985683,-28.657378557,0.17,0.38,0.09,0.13,0.20,0.26,0.31 2015-03-24 13:51:42,86.5537398,-28.374207186,0.18,0.50,0.12,0.14,0.20,0.31,0.37 2015-03-24 13:53:03,86.465367527,-28.109256326,0.17,0.47,0.11,0.13,0.19,0.28,0.32 2015-03-24 13:54:24,86.37700015,-27.850527125,0.18,0.45,0.11,0.14,0.21,0.28,0.35 2015-03-24 13:55:44,86.288651614,-27.596373903,0.20,0.48,0.13,0.16,0.22,0.36,0.42 2015-03-24 13:57:05,86.200121759,-27.363734946,0.21,0.46,0.12,0.15,0.24,0.35,0.42 2015-03-24 13:58:27,86.111571124,-27.138245862,0.18,0.61,0.11,0.13,0.21,0.32,0.42 2015-03-24 13:59:48,86.022950627,-26.923892615,0.20,0.47,0.13,0.16,0.23,0.30,0.39 2015-03-24 14:01:09,85.934288437,-26.717903847,0.16,0.34,0.10,0.13,0.18,0.25,0.30 2015-03-24 14:02:31,85.845576025,-26.520734919,0.18,0.44,0.12,0.14,0.20,0.26,0.33 2015-03-24 14:04:16,85.7310422263,-26.2815789452,0.17,0.79,0.07,0.10,0.22,0.30,0.36 2015-03-24 14:05:51,85.6273268857,-26.07096293,0.19,0.53,0.11,0.15,0.22,0.30,0.37 2015-03-24 14:07:13,85.538415234,-25.90064431,0.19,0.56,0.10,0.14,0.22,0.31,0.40 2015-03-24 14:08:35,85.449428894,-25.736859906,0.18,0.64,0.11,0.15,0.20,0.27,0.35 2015-03-24 14:09:57,85.360411085,-25.579087112,0.17,0.50,0.11,0.13,0.20,0.27,0.37 2015-03-24 14:11:20,85.271344438,-25.428277546,0.19,0.48,0.10,0.14,0.23,0.31,0.37 2015-03-24 14:12:24,85.2014582021,-25.3132448858,0.21,0.56,0.13,0.16,0.23,0.38,0.49 2015-03-24 14:16:44,85.1065109771,-23.4333902394,0.20,0.45,0.13,0.16,0.22,0.31,0.38 2015-03-24 14:18:02,85.160771183,-22.58942602,0.21,0.62,0.08,0.14,0.25,0.38,0.47 2015-03-24 14:19:19,85.213910436,-21.726104798,0.06,0.12,0.05,0.05,0.06,0.08,0.10 2015-03-24 14:20:36,85.265906845,-20.843335434,0.18,0.55,0.06,0.11,0.25,0.33,0.39 2015-03-24 14:21:53,85.316753641,-19.941172742,0.23,0.55,0.13,0.17,0.28,0.36,0.43 2015-03-24 14:23:10,85.366440946,-19.019669386,0.18,0.38,0.11,0.14,0.21,0.29,0.33 2015-03-24 14:24:31,85.4166903628,-18.0370274409,0.20,0.50,0.11,0.15,0.24,0.33,0.39 2015-03-24 14:26:08,85.4764120497,-16.8151004586,0.18,0.88,0.12,0.14,0.20,0.28,0.38 2015-03-24 14:27:26,85.522036706,-15.826102868,0.17,0.40,0.11,0.13,0.19,0.24,0.31 2015-03-24 14:28:43,85.566207849,-14.819259261,0.17,0.47,0.11,0.14,0.19,0.25,0.35 2015-03-24 14:30:00,85.608949523,-13.792256161,0.23,0.53,0.11,0.16,0.27,0.40,0.47 2015-03-24 14:31:17,85.650249946,-12.745397543,0.19,0.46,0.12,0.15,0.22,0.31,0.39 2015-03-24 14:32:34,85.690153663,-11.679373456,0.19,0.51,0.12,0.15,0.22,0.28,0.35 2015-03-24 14:33:51,85.728503883,-10.593601394,0.17,0.48,0.11,0.13,0.19,0.26,0.36 2015-03-24 14:35:08,85.765220448,-9.488100755,0.17,0.46,0.11,0.14,0.20,0.26,0.33 2015-03-24 14:36:25,85.800454389,-8.364383681,0.17,0.38,0.11,0.14,0.20,0.28,0.34 2015-03-24 14:37:41,85.834017845,-7.221951252,0.19,0.38,0.13,0.16,0.22,0.29,0.33 2015-03-24 14:38:58,85.865881764,-6.061351221,0.23,0.56,0.13,0.17,0.27,0.42,0.48 2015-03-24 14:40:14,85.896035748,-4.883287044,0.17,0.39,0.11,0.13,0.19,0.26,0.34 2015-03-24 14:41:31,85.924429568,-3.688301096,0.16,0.44,0.11,0.12,0.18,0.24,0.31 2015-03-24 14:42:18,85.9413052645,-2.93895466529,0.19,0.38,0.12,0.15,0.23,0.33,0.35 2015-03-24 14:46:47,85.801074148,-1.708087791,0.21,0.66,0.11,0.15,0.25,0.38,0.55 2015-03-24 14:48:11,85.720379359,-2.341199539,0.18,0.42,0.11,0.14,0.21,0.31,0.38 2015-03-24 14:49:38,85.6361816871,-2.97472297422,0.23,0.70,0.13,0.18,0.28,0.38,0.44 2015-03-24 14:51:05,85.5514793981,-3.58406867378,0.18,0.47,0.11,0.14,0.20,0.29,0.38 2015-03-24 14:52:25,85.472433295,-4.129510166,0.15,0.31,0.10,0.12,0.18,0.24,0.27 2015-03-24 14:53:46,85.392989568,-4.656205845,0.16,0.38,0.11,0.13,0.18,0.27,0.35 2015-03-24 14:55:07,85.313167499,-5.164892792,0.17,0.40,0.12,0.14,0.20,0.26,0.31 2015-03-24 14:56:27,85.23302588,-5.657401763,0.19,0.39,0.12,0.15,0.22,0.28,0.34 2015-03-24 14:57:48,85.15250156,-6.132566977,0.19,0.71,0.12,0.14,0.22,0.31,0.49 2015-03-24 14:59:09,85.071676747,-6.592692012,0.19,0.39,0.11,0.15,0.23,0.30,0.35 2015-03-24 15:00:30,84.990537504,-7.037761634,0.16,0.38,0.10,0.13,0.19,0.26,0.32 2015-03-24 15:01:50,84.90910946,-7.468682872,0.21,0.46,0.12,0.16,0.25,0.33,0.41 2015-03-24 15:03:12,84.827413988,-7.886296464,0.19,0.60,0.06,0.15,0.23,0.33,0.41 2015-03-24 15:04:33,84.745451865,-8.290951912,0.19,0.39,0.11,0.15,0.22,0.30,0.36 2015-03-24 15:05:54,84.663238673,-8.683228119,0.18,0.45,0.11,0.15,0.21,0.28,0.36 2015-03-24 15:07:15,84.580770289,-9.063262873,0.17,0.58,0.08,0.13,0.21,0.29,0.37 2015-03-24 15:08:36,84.4980933937,-9.432441287,0.17,0.47,0.08,0.12,0.21,0.30,0.40 2015-03-24 15:09:57,84.4151766816,-9.79020911956,0.16,0.49,0.07,0.13,0.19,0.26,0.32 2015-03-24 15:11:18,84.3321421096,-10.1398070976,0.12,0.46,0.06,0.08,0.15,0.23,0.35 2015-03-24 15:12:38,84.248721177,-10.474785402,0.15,0.37,0.10,0.13,0.17,0.23,0.30 2015-03-24 15:13:59,84.165209959,-10.802733922,0.18,0.46,0.12,0.15,0.20,0.30,0.38 2015-03-24 15:15:20,84.081529014,-11.121812034,0.21,0.40,0.12,0.17,0.25,0.31,0.35 2015-03-24 15:16:42,83.997637131,-11.431156827,0.30,0.59,0.18,0.24,0.35,0.47,0.53 2015-03-24 15:18:03,83.913576048,-11.731977693,0.25,0.51,0.14,0.21,0.29,0.36,0.41 2015-03-24 15:19:24,83.829367713,-12.024988261,0.23,0.53,0.11,0.17,0.29,0.38,0.43 2015-03-24 15:20:44,83.745021276,-12.310561546,0.17,0.55,0.06,0.11,0.21,0.37,0.47 2015-03-24 15:22:05,83.660488366,-12.587632808,0.22,0.54,0.14,0.17,0.25,0.36,0.48 2015-03-24 15:23:25,83.575845673,-12.858339289,0.22,0.49,0.13,0.17,0.25,0.35,0.42 2015-03-24 15:24:46,83.491060854,-13.121928623,0.19,0.55,0.08,0.15,0.23,0.30,0.36 2015-03-24 15:26:06,83.406124353,-13.378284276,0.21,0.54,0.12,0.16,0.24,0.34,0.41 2015-03-24 15:27:26,83.321080009,-13.6286317,0.22,0.53,0.12,0.16,0.28,0.39,0.47 2015-03-24 15:28:46,83.235902323,-13.872438024,0.22,0.58,0.14,0.17,0.25,0.36,0.42 2015-03-24 15:30:06,83.150619752,-14.110530862,0.22,0.60,0.13,0.17,0.25,0.37,0.47 2015-03-24 15:31:26,83.065203821,-14.342308867,0.19,0.47,0.11,0.15,0.23,0.31,0.41 2015-03-24 15:32:47,82.979678775,-14.568533459,0.20,0.41,0.13,0.16,0.24,0.30,0.37 2015-03-24 15:34:07,82.894049353,-14.78935637,0.23,0.50,0.12,0.18,0.27,0.36,0.43 2015-03-24 15:35:29,82.808321493,-15.005035917,0.19,0.56,0.08,0.14,0.23,0.33,0.43 2015-03-24 15:36:50,82.722508272,-15.215983355,0.24,0.74,0.13,0.17,0.29,0.40,0.50 2015-03-24 15:38:11,82.636605873,-15.422182421,0.25,0.66,0.09,0.19,0.31,0.42,0.59 2015-03-24 15:39:31,82.550595787,-15.623226516,0.21,0.77,0.10,0.13,0.25,0.43,0.62 2015-03-24 15:40:52,82.464477704,-15.819193978,0.18,0.78,0.06,0.08,0.25,0.41,0.54 2015-03-24 15:42:12,82.3782847837,-16.0110898016,0.23,0.69,0.07,0.15,0.29,0.43,0.53 2015-03-24 15:43:33,82.291984405,-16.198067957,0.47,1.20,0.21,0.35,0.56,0.84,1.00 2015-03-24 15:44:20,82.2407908548,-16.3075685,0.45,0.78,0.30,0.39,0.52,0.63,0.74