# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20180322.10km.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 2018-03-22 13:17:10,82.5004071473,-15.176795612,0.18,0.53,0.09,0.14,0.21,0.28,0.39 2018-03-22 13:18:42,82.6027675163,-14.9488482254,0.24,1.86,0.12,0.17,0.28,0.41,0.50 2018-03-22 13:19:56,82.681479224,-14.769974997,0.30,0.61,0.14,0.23,0.38,0.47,0.52 2018-03-22 13:21:31,82.779394827,-14.5431930394,0.15,0.59,0.05,0.07,0.22,0.35,0.44 2018-03-22 13:22:43,82.854650488,-14.3637027248,0.22,0.72,0.09,0.17,0.27,0.35,0.47 2018-03-22 13:24:05,82.9397497698,-14.1559981459,0.19,0.44,0.10,0.14,0.23,0.30,0.34 2018-03-22 13:24:49,82.9847588295,-14.0486289767,0.18,0.33,0.12,0.15,0.20,0.29,0.32 2018-03-22 13:27:20,83.1417389738,-13.641829934,0.15,0.27,0.10,0.12,0.18,0.23,0.26 2018-03-22 13:28:14,83.197220316,-13.495720047,0.17,0.39,0.10,0.14,0.20,0.25,0.29 2018-03-22 13:29:37,83.2828282106,-13.2651376952,0.17,0.36,0.10,0.13,0.20,0.25,0.29 2018-03-22 13:31:00,83.368332265,-13.028153959,0.17,0.33,0.10,0.14,0.20,0.25,0.29 2018-03-22 13:32:24,83.4537546882,-12.7858623217,0.14,0.30,0.08,0.11,0.17,0.22,0.26 2018-03-22 13:33:49,83.5408120452,-12.5309893087,0.14,0.30,0.09,0.11,0.16,0.22,0.25 2018-03-22 13:35:07,83.6202211345,-12.2931053175,0.16,0.88,0.09,0.13,0.19,0.27,0.33 2018-03-22 13:37:07,83.7425435017,-11.9157632428,0.11,0.29,0.04,0.05,0.16,0.22,0.25 2018-03-22 13:38:00,83.796290575,-11.743274061,0.14,0.32,0.04,0.10,0.18,0.24,0.26 2018-03-22 13:39:23,83.881116869,-11.467590927,0.16,0.39,0.07,0.11,0.19,0.27,0.34 2018-03-22 13:40:47,83.965753146,-11.182776896,0.15,0.37,0.09,0.12,0.18,0.24,0.29 2018-03-22 13:42:11,84.0502784,-10.890712349,0.13,0.36,0.05,0.10,0.15,0.23,0.32 2018-03-22 13:43:35,84.134589084,-10.589808419,0.16,0.37,0.08,0.13,0.18,0.24,0.30 2018-03-22 13:44:58,84.21882124,-10.281569631,0.13,0.33,0.07,0.09,0.15,0.23,0.27 2018-03-22 13:46:22,84.302877843,-9.964780439,0.12,0.31,0.08,0.09,0.14,0.21,0.26 2018-03-22 13:47:45,84.386716719,-9.637458567,0.11,0.26,0.08,0.09,0.12,0.16,0.20 2018-03-22 13:49:09,84.470403819,-9.301247562,0.15,0.35,0.09,0.12,0.17,0.23,0.29 2018-03-22 13:50:33,84.553870669,-8.953913628,0.14,0.43,0.05,0.10,0.18,0.25,0.30 2018-03-22 13:51:57,84.637119409,-8.596481846,0.17,0.39,0.09,0.13,0.20,0.29,0.36 2018-03-22 13:53:20,84.720192202,-8.228624425,0.17,0.46,0.10,0.12,0.20,0.28,0.36 2018-03-22 13:54:44,84.803042801,-7.849151283,0.16,0.37,0.08,0.11,0.20,0.29,0.33 2018-03-22 13:56:08,84.885744887,-7.458098147,0.14,0.39,0.07,0.10,0.17,0.23,0.29 2018-03-22 13:57:31,84.968097676,-7.052299996,0.14,0.32,0.08,0.11,0.16,0.21,0.26 2018-03-22 13:58:54,85.050231549,-6.635573145,0.13,0.39,0.08,0.10,0.16,0.21,0.27 2018-03-22 14:00:19,85.133476181,-6.195188651,0.11,0.39,0.07,0.09,0.13,0.19,0.28 2018-03-22 14:02:04,85.234800924,-5.64086121,0.17,0.48,0.09,0.12,0.20,0.28,0.37 2018-03-22 14:03:29,85.316000196,-5.175162846,0.17,0.44,0.08,0.13,0.20,0.29,0.34 2018-03-22 14:04:34,85.3772345597,-4.81406517025,0.18,0.37,0.08,0.13,0.22,0.32,0.35 2018-03-22 14:10:03,85.437172492,-6.473687209,0.14,0.45,0.08,0.11,0.16,0.23,0.30 2018-03-22 14:11:20,85.372453187,-7.244406685,0.17,0.52,0.09,0.13,0.21,0.31,0.41 2018-03-22 14:12:39,85.31546386,-8.100429496,0.15,0.39,0.08,0.11,0.18,0.26,0.33 2018-03-22 14:13:59,85.259266005,-8.954095711,0.16,0.49,0.09,0.12,0.18,0.26,0.31 2018-03-22 14:15:18,85.204271686,-9.806088491,0.15,0.35,0.09,0.11,0.18,0.25,0.30 2018-03-22 14:16:36,85.148272529,-10.640579163,0.14,0.32,0.09,0.11,0.17,0.23,0.28 2018-03-22 14:17:54,85.091107143,-11.455408823,0.17,0.49,0.08,0.12,0.21,0.32,0.41 2018-03-22 14:19:13,85.033025399,-12.25152753,0.15,0.50,0.09,0.12,0.18,0.24,0.30 2018-03-22 14:20:31,84.974057612,-13.029643524,0.14,0.42,0.04,0.08,0.19,0.30,0.35 2018-03-22 14:21:49,84.914195251,-13.789735265,0.17,0.61,0.08,0.13,0.21,0.28,0.35 2018-03-22 14:23:08,84.853363318,-14.531063329,0.15,0.29,0.08,0.12,0.18,0.23,0.25 2018-03-22 14:24:28,84.791750432,-15.25553754,0.11,0.31,0.04,0.06,0.15,0.20,0.27 2018-03-22 14:25:48,84.729385992,-15.963547121,0.08,0.31,0.04,0.05,0.09,0.17,0.21 2018-03-22 14:27:09,84.6660951048,-16.6538585188,0.13,0.37,0.05,0.10,0.17,0.22,0.29 2018-03-22 14:28:29,84.602217877,-17.32881859,0.16,0.32,0.09,0.13,0.19,0.23,0.27 2018-03-22 14:29:50,84.537527908,-17.987460799,0.14,0.35,0.07,0.10,0.16,0.23,0.29 2018-03-22 14:31:11,84.472122025,-18.630660021,0.15,0.49,0.05,0.11,0.18,0.29,0.37 2018-03-22 14:32:31,84.406069162,-19.258949723,0.14,0.37,0.07,0.10,0.17,0.22,0.29 2018-03-22 14:33:52,84.339354189,-19.872399498,0.13,0.31,0.08,0.11,0.16,0.20,0.27 2018-03-22 14:35:13,84.272023343,-20.471787874,0.13,0.36,0.06,0.10,0.16,0.24,0.30 2018-03-22 14:36:34,84.204077944,-21.057096564,0.17,0.54,0.10,0.13,0.20,0.27,0.36 2018-03-22 14:37:55,84.135548504,-21.628934739,0.16,0.49,0.05,0.06,0.24,0.35,0.44 2018-03-22 14:39:15,84.066446584,-22.187444605,0.18,0.47,0.06,0.08,0.27,0.35,0.40 2018-03-22 14:40:35,83.996808778,-22.733213721,0.14,0.42,0.06,0.10,0.16,0.27,0.34 2018-03-22 14:41:56,83.926633915,-23.266377798,0.12,0.30,0.06,0.09,0.14,0.19,0.25 2018-03-22 14:43:16,83.855944709,-23.787304914,0.08,0.20,0.05,0.06,0.10,0.14,0.17 2018-03-22 14:44:38,83.784770709,-24.296460056,0.09,0.46,0.04,0.05,0.12,0.21,0.30 2018-03-22 14:46:01,83.713109711,-24.793947999,0.08,0.30,0.04,0.06,0.10,0.16,0.20 2018-03-22 14:47:04,83.6575620738,-25.1702028303,0.11,0.41,0.04,0.05,0.14,0.26,0.32 2018-03-22 14:53:14,83.844287384,-26.489487438,0.31,0.81,0.07,0.20,0.41,0.51,0.60 2018-03-22 14:54:33,83.933943393,-26.448718541,0.20,0.68,0.05,0.09,0.30,0.50,0.58 2018-03-22 14:55:53,84.023593772,-26.394516805,0.07,0.23,0.04,0.05,0.08,0.13,0.18 2018-03-22 14:57:13,84.113225496,-26.337871249,0.08,0.21,0.05,0.06,0.09,0.12,0.15 2018-03-22 14:58:35,84.202858485,-26.279796574,0.17,0.54,0.05,0.08,0.25,0.39,0.47 2018-03-22 14:59:57,84.292484943,-26.219419753,0.23,0.46,0.10,0.17,0.29,0.37,0.44 2018-03-22 15:01:19,84.382106861,-26.157296362,0.17,0.51,0.08,0.13,0.21,0.29,0.34 2018-03-22 15:02:40,84.471722967,-26.093276594,0.15,0.35,0.07,0.11,0.20,0.27,0.32 2018-03-22 15:04:02,84.561331602,-26.02709545,0.18,0.68,0.09,0.12,0.21,0.33,0.41 2018-03-22 15:05:24,84.650933604,-25.958767394,0.17,0.48,0.08,0.12,0.21,0.31,0.37 2018-03-22 15:06:46,84.740526269,-25.888099794,0.17,0.47,0.09,0.12,0.21,0.30,0.36 2018-03-22 15:08:08,84.830111224,-25.815157632,0.17,0.44,0.08,0.12,0.22,0.29,0.36 2018-03-22 15:09:30,84.919685688,-25.739560258,0.13,0.43,0.05,0.07,0.18,0.26,0.31 2018-03-22 15:10:52,85.009254921,-25.661293074,0.18,0.61,0.10,0.13,0.22,0.35,0.47 2018-03-22 15:12:15,85.098811327,-25.579986847,0.20,0.45,0.09,0.14,0.25,0.32,0.37 2018-03-22 15:13:37,85.188359064,-25.495925491,0.19,0.49,0.09,0.13,0.23,0.30,0.38 2018-03-22 15:14:59,85.277896718,-25.40819992,0.17,0.41,0.08,0.12,0.20,0.28,0.32 2018-03-22 15:16:21,85.367425748,-25.317589625,0.15,0.38,0.08,0.11,0.18,0.24,0.28 2018-03-22 15:17:43,85.456938072,-25.222881503,0.14,0.50,0.08,0.10,0.16,0.22,0.30 2018-03-22 15:19:05,85.546446117,-25.124733361,0.15,0.41,0.09,0.11,0.16,0.24,0.33 2018-03-22 15:20:27,85.635936899,-25.022796804,0.12,0.52,0.06,0.09,0.14,0.20,0.38 2018-03-22 15:21:50,85.725408968,-24.916693802,0.17,0.47,0.10,0.13,0.20,0.29,0.37 2018-03-22 15:23:13,85.81486499,-24.805697306,0.15,0.38,0.08,0.11,0.17,0.25,0.33 2018-03-22 15:24:35,85.90430886,-24.690058312,0.13,0.31,0.06,0.09,0.16,0.22,0.27 2018-03-22 15:25:58,85.993735036,-24.569356749,0.16,0.53,0.08,0.12,0.18,0.27,0.40 2018-03-22 15:27:20,86.0831392802,-24.4426415164,0.16,0.44,0.09,0.11,0.19,0.28,0.35 2018-03-22 15:28:42,86.172527215,-24.310939468,0.16,0.50,0.08,0.11,0.19,0.31,0.42 2018-03-22 15:30:05,86.261891421,-24.17251278,0.15,0.42,0.08,0.10,0.19,0.27,0.33 2018-03-22 15:31:27,86.351232725,-24.026972104,0.15,0.54,0.08,0.10,0.18,0.26,0.34 2018-03-22 15:32:50,86.440546047,-23.874515089,0.13,0.41,0.06,0.09,0.17,0.24,0.31 2018-03-22 15:34:13,86.529836298,-23.714679037,0.16,0.51,0.09,0.12,0.19,0.29,0.39 2018-03-22 15:35:36,86.619098002,-23.544608537,0.13,0.34,0.07,0.10,0.16,0.22,0.28 2018-03-22 15:37:00,86.70834593,-23.367554232,0.15,0.50,0.09,0.11,0.16,0.28,0.38 2018-03-22 15:38:22,86.7941523864,-23.1861225974,0.14,0.38,0.08,0.10,0.16,0.23,0.29 2018-03-22 15:44:03,86.764092327,-26.535910476,0.14,0.33,0.08,0.10,0.17,0.23,0.28 2018-03-22 15:45:21,86.692989497,-27.498102189,0.16,0.32,0.09,0.12,0.19,0.24,0.26 2018-03-22 15:46:39,86.621009596,-28.41998581,0.14,0.35,0.09,0.11,0.17,0.23,0.30 2018-03-22 15:47:56,86.548198712,-29.30291837,0.15,0.43,0.07,0.11,0.17,0.23,0.28 2018-03-22 15:49:15,86.4745935626,-30.1489967806,0.15,0.44,0.08,0.11,0.18,0.28,0.37 2018-03-22 15:50:33,86.400285876,-30.961307973,0.15,0.40,0.08,0.11,0.17,0.24,0.32 2018-03-22 15:51:51,86.325280443,-31.740570701,0.15,0.39,0.08,0.11,0.19,0.26,0.32 2018-03-22 15:53:10,86.249648036,-32.489157427,0.17,0.53,0.10,0.12,0.20,0.32,0.46 2018-03-22 15:54:29,86.173397054,-33.207833224,0.16,0.40,0.09,0.12,0.20,0.27,0.33 2018-03-22 15:55:49,86.09651794,-33.897143851,0.16,0.39,0.10,0.13,0.19,0.25,0.31 2018-03-22 15:57:10,86.019180589,-34.562009923,0.17,0.39,0.09,0.13,0.21,0.27,0.32 2018-03-22 15:58:29,85.941316902,-35.201217194,0.16,0.43,0.09,0.11,0.19,0.26,0.32 2018-03-22 15:59:49,85.862988067,-35.816374871,0.17,0.42,0.10,0.13,0.20,0.29,0.36 2018-03-22 16:01:08,85.784223456,-36.409509259,0.15,0.36,0.10,0.12,0.17,0.24,0.32 2018-03-22 16:02:28,85.705058582,-36.981789511,0.17,0.45,0.09,0.12,0.20,0.28,0.34 2018-03-22 16:03:50,85.625415231,-37.53136884,0.17,0.46,0.08,0.12,0.21,0.30,0.37 2018-03-22 16:05:11,85.545440263,-38.063071657,0.15,0.44,0.08,0.11,0.18,0.25,0.29 2018-03-22 16:06:31,85.465093562,-38.575862574,0.17,0.40,0.08,0.12,0.21,0.29,0.35 2018-03-22 16:07:50,85.384401464,-39.070832366,0.21,0.46,0.11,0.16,0.26,0.35,0.39 2018-03-22 16:09:11,85.303395187,-39.549159775,0.21,0.41,0.12,0.15,0.25,0.33,0.37 2018-03-22 16:10:17,85.2374967781,-39.9258450675,0.17,0.49,0.05,0.10,0.23,0.31,0.36 2018-03-22 16:16:31,84.8571753714,-41.8942767048,0.16,0.27,0.04,0.10,0.21,0.24,0.26 2018-03-22 16:17:16,84.811427391,-42.107730429,0.23,0.57,0.09,0.15,0.29,0.38,0.45 2018-03-22 16:18:38,84.728554535,-42.488160507,0.20,0.53,0.09,0.15,0.25,0.34,0.41 2018-03-22 16:19:59,84.645465764,-42.856892853,0.22,0.53,0.12,0.16,0.27,0.35,0.43 2018-03-22 16:21:20,84.562160608,-43.214188818,0.17,0.38,0.07,0.12,0.22,0.29,0.34 2018-03-22 16:22:42,84.478677674,-43.561517274,0.19,0.50,0.08,0.13,0.23,0.32,0.39 2018-03-22 16:24:03,84.395018533,-43.899105996,0.20,0.53,0.09,0.14,0.24,0.34,0.46 2018-03-22 16:25:25,84.311174044,-44.226849393,0.25,0.75,0.12,0.17,0.29,0.43,0.59 2018-03-22 16:26:46,84.227151255,-44.545119323,0.17,0.64,0.04,0.08,0.23,0.35,0.49 2018-03-22 16:28:07,84.142958605,-44.854228637,0.18,0.48,0.03,0.10,0.25,0.33,0.40 2018-03-22 16:29:28,84.058600593,-45.15468377,0.21,0.48,0.10,0.16,0.25,0.33,0.37 2018-03-22 16:30:48,83.974094418,-45.447014379,0.19,0.49,0.06,0.13,0.23,0.32,0.39 2018-03-22 16:32:08,83.889453434,-45.731700559,0.18,0.49,0.08,0.12,0.24,0.33,0.40 2018-03-22 16:33:28,83.804668496,-46.00868047,0.23,0.89,0.08,0.14,0.30,0.48,0.61 2018-03-22 16:34:48,83.719752706,-46.278459212,0.22,0.58,0.11,0.16,0.27,0.39,0.46 2018-03-22 16:36:07,83.6352403009,-46.5389258085,0.23,0.69,0.13,0.18,0.28,0.38,0.49 2018-03-22 16:39:33,83.4701187521,-47.8074473205,0.28,0.70,0.11,0.21,0.34,0.48,0.57 2018-03-22 16:41:08,83.4181075557,-48.6182242833,0.24,0.53,0.05,0.17,0.31,0.41,0.46 2018-03-22 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