# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20150329.10km.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 2015-03-29 20:56:53,72.1372913995,-161.873195684,0.20,1.00,0.09,0.14,0.23,0.32,0.50 2015-03-29 20:58:29,72.2290144119,-161.859290613,0.15,0.40,0.07,0.10,0.18,0.30,0.35 2015-03-29 21:00:04,72.319494505,-161.847310264,0.14,0.43,0.07,0.10,0.17,0.27,0.36 2015-03-29 21:01:42,72.40998106,-161.834901237,0.15,0.52,0.06,0.09,0.18,0.29,0.43 2015-03-29 21:03:18,72.500343354,-161.822189476,0.13,0.46,0.07,0.09,0.15,0.24,0.37 2015-03-29 21:04:53,72.5901478796,-161.810698756,0.15,0.44,0.07,0.09,0.20,0.32,0.38 2015-03-29 21:06:21,72.67990344,-161.798340068,0.13,0.35,0.07,0.09,0.15,0.22,0.29 2015-03-29 21:07:46,72.769651752,-161.785335434,0.14,0.38,0.08,0.10,0.17,0.25,0.29 2015-03-29 21:09:09,72.859369009,-161.769759482,0.15,0.42,0.09,0.11,0.17,0.30,0.38 2015-03-29 21:10:32,72.949142483,-161.758762136,0.19,0.41,0.10,0.14,0.24,0.32,0.36 2015-03-29 21:11:53,73.038893821,-161.745936842,0.23,1.09,0.10,0.14,0.29,0.42,0.68 2015-03-29 21:13:16,73.128649124,-161.733234599,0.15,0.50,0.08,0.09,0.19,0.28,0.35 2015-03-29 21:14:37,73.218380575,-161.718554012,0.17,0.42,0.08,0.11,0.21,0.29,0.37 2015-03-29 21:15:59,73.308127838,-161.705072039,0.15,0.43,0.08,0.10,0.18,0.28,0.36 2015-03-29 21:17:20,73.397876472,-161.691640624,0.18,0.43,0.07,0.13,0.21,0.29,0.37 2015-03-29 21:18:41,73.487624417,-161.678115424,0.13,0.43,0.08,0.10,0.15,0.23,0.34 2015-03-29 21:20:02,73.577366405,-161.664087423,0.12,0.32,0.08,0.09,0.13,0.19,0.23 2015-03-29 21:21:23,73.667106099,-161.649853833,0.18,0.54,0.08,0.12,0.23,0.35,0.43 2015-03-29 21:22:46,73.75684891,-161.635650688,0.14,0.40,0.07,0.09,0.17,0.27,0.33 2015-03-29 21:24:09,73.846588479,-161.621087182,0.17,0.54,0.09,0.12,0.21,0.29,0.37 2015-03-29 21:25:32,73.936328199,-161.606480911,0.16,0.45,0.07,0.11,0.19,0.26,0.37 2015-03-29 21:26:55,74.026066529,-161.591700615,0.16,0.55,0.07,0.12,0.20,0.28,0.34 2015-03-29 21:28:18,74.115802734,-161.576715553,0.16,0.31,0.10,0.13,0.19,0.24,0.28 2015-03-29 21:29:41,74.205539788,-161.561740101,0.15,0.42,0.09,0.11,0.17,0.25,0.34 2015-03-29 21:31:04,74.295272711,-161.546332573,0.15,0.43,0.07,0.10,0.18,0.29,0.35 2015-03-29 21:32:27,74.385007857,-161.530906834,0.15,0.40,0.08,0.11,0.17,0.24,0.33 2015-03-29 21:33:49,74.474736451,-161.514891897,0.11,0.38,0.07,0.08,0.13,0.18,0.26 2015-03-29 21:35:10,74.564467486,-161.49901323,0.15,0.80,0.07,0.10,0.18,0.27,0.38 2015-03-29 21:36:34,74.654204496,-161.483536173,0.12,0.31,0.08,0.09,0.15,0.19,0.27 2015-03-29 21:37:58,74.74393458,-161.467457307,0.12,0.47,0.06,0.09,0.14,0.20,0.28 2015-03-29 21:39:23,74.8336617743,-161.451119657,0.14,0.45,0.08,0.09,0.17,0.22,0.30 2015-03-29 21:40:47,74.9233871225,-161.434563409,0.15,0.33,0.08,0.12,0.18,0.23,0.28 2015-03-29 21:42:12,75.013114742,-161.417920722,0.14,0.46,0.07,0.09,0.17,0.25,0.36 2015-03-29 21:43:36,75.1028395,-161.400953164,0.14,0.37,0.07,0.10,0.18,0.25,0.30 2015-03-29 21:45:00,75.192564374,-161.383919559,0.16,0.42,0.08,0.10,0.20,0.31,0.35 2015-03-29 21:46:24,75.282287836,-161.36670455,0.13,0.40,0.06,0.08,0.16,0.23,0.30 2015-03-29 21:47:48,75.372007295,-161.349105515,0.14,0.46,0.05,0.08,0.18,0.30,0.36 2015-03-29 21:48:40,75.4287137538,-161.338313102,0.17,0.32,0.06,0.12,0.22,0.29,0.32 2015-03-29 21:53:41,75.715681031,-160.838627615,0.13,0.38,0.06,0.09,0.15,0.22,0.30 2015-03-29 21:55:05,75.79327417,-160.65436344,0.15,0.49,0.07,0.10,0.19,0.29,0.42 2015-03-29 21:56:29,75.870753542,-160.468335581,0.12,0.37,0.07,0.09,0.14,0.22,0.30 2015-03-29 21:57:53,75.948073135,-160.280140726,0.12,0.39,0.07,0.09,0.13,0.23,0.33 2015-03-29 21:59:20,76.026858556,-160.077168827,0.11,0.25,0.08,0.10,0.13,0.17,0.22 2015-03-29 22:00:56,76.095460429,-159.780729634,0.12,0.32,0.08,0.09,0.13,0.18,0.25 2015-03-29 22:02:23,76.160657231,-159.509314087,0.13,0.35,0.06,0.09,0.16,0.22,0.28 2015-03-29 22:03:49,76.224769046,-159.2456406,0.12,0.53,0.07,0.09,0.14,0.20,0.28 2015-03-29 22:05:14,76.288480334,-158.979051046,0.13,0.46,0.07,0.09,0.15,0.22,0.26 2015-03-29 22:06:40,76.351915746,-158.710082562,0.12,0.34,0.08,0.09,0.14,0.21,0.25 2015-03-29 22:08:06,76.414901497,-158.438016386,0.14,0.32,0.07,0.10,0.17,0.24,0.28 2015-03-29 22:09:32,76.477758561,-158.164175549,0.11,0.31,0.06,0.08,0.13,0.22,0.26 2015-03-29 22:10:57,76.540376139,-157.888079366,0.14,0.41,0.08,0.10,0.16,0.24,0.29 2015-03-29 22:12:23,76.602637449,-157.609242102,0.15,0.36,0.08,0.11,0.18,0.25,0.28 2015-03-29 22:13:49,76.6646108184,-157.327942283,0.13,0.34,0.07,0.10,0.15,0.21,0.26 2015-03-29 22:15:14,76.726256127,-157.044011053,0.12,0.30,0.06,0.09,0.15,0.21,0.25 2015-03-29 22:16:39,76.787567292,-156.757418455,0.12,0.33,0.06,0.08,0.14,0.19,0.23 2015-03-29 22:18:04,76.848622396,-156.468466424,0.16,0.47,0.09,0.12,0.19,0.27,0.40 2015-03-29 22:19:29,76.909292397,-156.176634038,0.15,0.41,0.06,0.11,0.18,0.26,0.31 2015-03-29 22:20:54,76.969597765,-155.882004704,0.14,0.64,0.07,0.10,0.16,0.25,0.33 2015-03-29 22:22:18,77.0296622788,-155.58507073,0.13,0.31,0.07,0.09,0.15,0.22,0.25 2015-03-29 22:23:43,77.089352098,-155.285293289,0.12,0.34,0.07,0.09,0.14,0.23,0.29 2015-03-29 22:25:07,77.148726293,-154.982904386,0.13,0.49,0.06,0.09,0.15,0.23,0.36 2015-03-29 22:26:32,77.207733729,-154.677694033,0.14,0.38,0.07,0.10,0.17,0.26,0.34 2015-03-29 22:27:56,77.266372357,-154.369645413,0.13,0.40,0.06,0.09,0.16,0.23,0.29 2015-03-29 22:29:20,77.324658434,-154.058829891,0.13,0.39,0.07,0.10,0.15,0.21,0.30 2015-03-29 22:30:45,77.3825478931,-153.745006668,0.11,0.34,0.05,0.07,0.13,0.19,0.24 2015-03-29 22:32:09,77.440219584,-153.427457151,0.14,0.38,0.07,0.09,0.16,0.24,0.31 2015-03-29 22:33:33,77.497387917,-153.108099356,0.14,0.38,0.06,0.09,0.19,0.26,0.32 2015-03-29 22:34:58,77.55417351,-152.785857772,0.15,0.38,0.06,0.10,0.19,0.25,0.32 2015-03-29 22:36:22,77.610566262,-152.460681711,0.15,0.42,0.09,0.12,0.17,0.24,0.31 2015-03-29 22:37:46,77.66657024,-152.132588532,0.13,0.31,0.08,0.10,0.15,0.22,0.27 2015-03-29 22:39:09,77.7222014676,-151.801645326,0.12,0.45,0.06,0.08,0.15,0.23,0.30 2015-03-29 22:40:33,77.7774231753,-151.467715854,0.15,0.36,0.08,0.11,0.17,0.25,0.31 2015-03-29 22:41:56,77.832274248,-151.130944717,0.16,0.43,0.09,0.12,0.19,0.25,0.33 2015-03-29 22:43:20,77.886653182,-150.790965226,0.15,0.37,0.06,0.10,0.19,0.26,0.31 2015-03-29 22:44:44,77.941016078,-150.445318478,0.14,0.43,0.06,0.10,0.18,0.25,0.33 2015-03-29 22:46:10,77.9965423023,-150.083474086,0.17,0.36,0.09,0.13,0.20,0.28,0.34 2015-03-29 22:47:47,78.0385009847,-149.632979172,0.19,0.53,0.08,0.12,0.24,0.36,0.43 2015-03-29 22:49:13,78.06561341,-149.207416616,0.14,0.54,0.08,0.11,0.17,0.23,0.30 2015-03-29 22:50:37,78.093235529,-148.792571662,0.14,0.37,0.05,0.10,0.16,0.24,0.30 2015-03-29 22:52:01,78.120470736,-148.376264517,0.15,0.53,0.08,0.12,0.17,0.25,0.35 2015-03-29 22:53:25,78.146823472,-147.957547946,0.13,0.35,0.05,0.09,0.16,0.23,0.28 2015-03-29 22:54:48,78.172654437,-147.537664079,0.12,0.32,0.05,0.06,0.15,0.21,0.27 2015-03-29 22:56:11,78.198121474,-147.116915595,0.15,0.67,0.08,0.11,0.19,0.27,0.36 2015-03-29 22:57:34,78.222863362,-146.694255735,0.16,0.47,0.09,0.12,0.19,0.28,0.35 2015-03-29 22:58:58,78.246869717,-146.269714196,0.15,0.52,0.08,0.11,0.17,0.26,0.39 2015-03-29 23:00:22,78.270399133,-145.843685748,0.12,0.42,0.07,0.09,0.13,0.20,0.28 2015-03-29 23:01:46,78.2931575568,-145.415818247,0.14,0.56,0.06,0.10,0.17,0.24,0.32 2015-03-29 23:03:16,78.316938907,-144.953618769,0.18,0.71,0.09,0.13,0.21,0.33,0.45 2015-03-29 23:04:31,78.3364136531,-144.564638172,0.19,0.41,0.09,0.15,0.23,0.30,0.35 2015-03-29 23:09:46,78.176909345,-143.383291485,0.13,0.34,0.07,0.10,0.16,0.23,0.28 2015-03-29 23:11:20,78.094671202,-143.120857839,0.16,0.39,0.08,0.11,0.19,0.27,0.33 2015-03-29 23:12:50,78.015542514,-142.872525599,0.16,0.42,0.07,0.10,0.20,0.28,0.36 2015-03-29 23:14:16,77.939987985,-142.639184985,0.15,0.38,0.08,0.10,0.20,0.28,0.32 2015-03-29 23:15:42,77.864226408,-142.408874951,0.13,0.45,0.08,0.09,0.15,0.22,0.31 2015-03-29 23:17:08,77.788282674,-142.181342648,0.16,0.66,0.07,0.10,0.19,0.28,0.39 2015-03-29 23:18:34,77.712171927,-141.956454245,0.13,0.46,0.06,0.09,0.15,0.22,0.30 2015-03-29 23:20:00,77.6358750608,-141.734336603,0.13,0.40,0.06,0.09,0.16,0.23,0.30 2015-03-29 23:21:27,77.5594082,-141.514847305,0.15,0.44,0.08,0.11,0.19,0.28,0.34 2015-03-29 23:22:54,77.482757115,-141.298056616,0.20,0.55,0.07,0.13,0.26,0.43,0.52 2015-03-29 23:24:21,77.405926858,-141.08392655,0.12,0.32,0.07,0.09,0.14,0.21,0.27 2015-03-29 23:25:48,77.328940079,-140.872267623,0.12,0.31,0.07,0.09,0.15,0.21,0.28 2015-03-29 23:27:15,77.251803981,-140.663005729,0.14,0.31,0.06,0.10,0.17,0.22,0.26 2015-03-29 23:28:42,77.174483138,-140.456396421,0.14,0.48,0.08,0.10,0.17,0.25,0.32 2015-03-29 23:30:09,77.096961354,-140.252186002,0.14,0.44,0.07,0.10,0.17,0.25,0.32 2015-03-29 23:31:41,77.014717231,-140.043297105,0.13,0.41,0.08,0.10,0.15,0.23,0.29 2015-03-29 23:33:22,76.91500492,-139.923479761,0.18,0.52,0.08,0.11,0.22,0.36,0.47 2015-03-29 23:34:49,76.82648571,-139.852378111,0.14,0.45,0.07,0.09,0.17,0.27,0.34 2015-03-29 23:36:15,76.738161441,-139.778332405,0.14,0.45,0.08,0.10,0.18,0.25,0.31 2015-03-29 23:37:42,76.649792365,-139.705689053,0.11,0.37,0.05,0.05,0.16,0.23,0.30 2015-03-29 23:39:08,76.561409941,-139.633646631,0.14,0.46,0.08,0.10,0.16,0.23,0.28 2015-03-29 23:40:38,76.470217122,-139.56000516,0.17,0.42,0.10,0.13,0.20,0.26,0.31 2015-03-29 23:41:38,76.4092302964,-139.51148298,0.22,0.57,0.12,0.17,0.26,0.34,0.45