# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20150319.10km.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 2015-03-19 13:48:43,83.663655976,-28.977900416,0.40,1.10,0.16,0.28,0.50,0.73,0.85 2015-03-19 13:50:03,83.709999498,-28.278098383,0.33,1.40,0.06,0.16,0.44,0.84,1.04 2015-03-19 13:51:22,83.7547893472,-27.5648144398,0.27,0.60,0.07,0.19,0.34,0.45,0.53 2015-03-19 13:52:42,83.7990308202,-26.8435499748,0.27,0.66,0.07,0.17,0.35,0.46,0.55 2015-03-19 13:54:03,83.8430067667,-26.1033738133,0.10,1.02,0.05,0.06,0.09,0.26,0.42 2015-03-19 13:55:21,83.884385061,-25.36979311,0.19,0.63,0.06,0.10,0.26,0.41,0.50 2015-03-19 13:56:40,83.925501608,-24.617577984,0.17,0.48,0.06,0.11,0.22,0.33,0.43 2015-03-19 13:57:59,83.965484735,-23.854912289,0.23,0.56,0.11,0.16,0.28,0.39,0.44 2015-03-19 13:59:18,84.00443176,-23.082426965,0.23,0.61,0.14,0.18,0.27,0.35,0.42 2015-03-19 14:00:38,84.042372571,-22.300392852,0.21,0.44,0.11,0.17,0.25,0.33,0.39 2015-03-19 14:01:58,84.07911182,-21.508157295,0.21,0.54,0.10,0.15,0.25,0.34,0.39 2015-03-19 14:03:18,84.114738065,-20.706322154,0.18,0.60,0.06,0.08,0.24,0.35,0.42 2015-03-19 14:04:37,84.149180225,-19.894817139,0.20,0.46,0.08,0.14,0.25,0.34,0.41 2015-03-19 14:05:55,84.182387005,-19.073685653,0.23,0.49,0.07,0.14,0.31,0.41,0.46 2015-03-19 14:07:14,84.214644134,-18.244266575,0.15,0.50,0.06,0.08,0.19,0.35,0.42 2015-03-19 14:08:19,84.2402936069,-17.5497589399,0.17,0.31,0.10,0.13,0.20,0.27,0.30 2015-03-19 14:11:28,84.3099325122,-15.4985432448,0.17,0.53,0.05,0.10,0.22,0.34,0.44 2015-03-19 14:12:28,84.330491797,-14.835379966,0.12,0.33,0.05,0.06,0.16,0.25,0.29 2015-03-19 14:13:47,84.356295116,-13.962396141,0.18,0.41,0.09,0.13,0.22,0.30,0.35 2015-03-19 14:15:06,84.38082622,-13.081749266,0.23,0.48,0.13,0.18,0.26,0.34,0.41 2015-03-19 14:16:24,84.403937272,-12.193376612,0.20,0.42,0.12,0.16,0.23,0.29,0.35 2015-03-19 14:17:43,84.425818214,-11.29817409,0.18,0.51,0.08,0.13,0.22,0.31,0.40 2015-03-19 14:19:01,84.44624655,-10.395937571,0.18,0.39,0.12,0.15,0.21,0.29,0.35 2015-03-19 14:20:20,84.465310452,-9.487319282,0.21,0.51,0.13,0.17,0.25,0.32,0.37 2015-03-19 14:21:38,84.483040525,-8.572785861,0.21,0.45,0.13,0.17,0.24,0.31,0.40 2015-03-19 14:22:57,84.499311303,-7.652513394,0.18,0.41,0.10,0.13,0.21,0.27,0.32 2015-03-19 14:24:16,84.514106855,-6.726946603,0.17,0.37,0.09,0.13,0.21,0.27,0.32 2015-03-19 14:25:34,84.527505385,-5.796682834,0.17,0.44,0.09,0.12,0.21,0.29,0.36 2015-03-19 14:26:52,84.539509738,-4.862187686,0.14,0.48,0.08,0.10,0.17,0.28,0.38 2015-03-19 14:28:11,84.550013648,-3.923754177,0.17,0.49,0.09,0.12,0.20,0.32,0.45 2015-03-19 14:29:29,84.55909313,-2.981989553,0.17,0.43,0.09,0.12,0.20,0.31,0.36 2015-03-19 14:30:48,84.566670072,-2.037310704,0.18,0.42,0.09,0.13,0.21,0.28,0.35 2015-03-19 14:32:06,84.572743907,-1.090247099,0.15,0.48,0.09,0.11,0.18,0.26,0.36 2015-03-19 14:33:24,84.577382039,-0.141343262,0.16,0.40,0.09,0.12,0.19,0.27,0.33 2015-03-19 14:34:42,84.580608893,0.808892738,0.15,0.38,0.09,0.11,0.17,0.24,0.32 2015-03-19 14:36:00,84.582297793,1.759995806,0.13,0.35,0.08,0.10,0.16,0.24,0.29 2015-03-19 14:37:19,84.582482547,2.711449029,0.15,0.28,0.09,0.12,0.17,0.23,0.26 2015-03-19 14:38:37,84.581187406,3.662713529,0.14,0.32,0.09,0.11,0.16,0.21,0.25 2015-03-19 14:39:55,84.578505722,4.613303478,0.14,0.38,0.09,0.11,0.16,0.22,0.29 2015-03-19 14:41:13,84.574211138,5.562615113,0.17,0.56,0.11,0.14,0.20,0.25,0.32 2015-03-19 14:42:31,84.568440447,6.510170799,0.15,0.39,0.09,0.11,0.18,0.26,0.31 2015-03-19 14:43:50,84.561271655,7.455530621,0.19,0.49,0.11,0.14,0.23,0.30,0.37 2015-03-19 14:45:08,84.552603312,8.398115886,0.14,0.32,0.09,0.11,0.17,0.22,0.25 2015-03-19 14:46:26,84.542466224,9.337469291,0.18,0.39,0.11,0.14,0.21,0.28,0.32 2015-03-19 14:47:45,84.530855819,10.273076936,0.17,0.38,0.09,0.13,0.20,0.28,0.33 2015-03-19 14:49:03,84.517829797,11.204532142,0.14,0.36,0.09,0.11,0.17,0.22,0.26 2015-03-19 14:50:22,84.503374655,12.131346433,0.17,0.38,0.09,0.12,0.21,0.28,0.33 2015-03-19 14:51:41,84.48750117,13.053076681,0.20,0.55,0.10,0.15,0.24,0.34,0.42 2015-03-19 14:53:00,84.47024707,13.969354978,0.16,0.46,0.10,0.12,0.18,0.26,0.32 2015-03-19 14:54:19,84.451558296,14.880313959,0.16,0.35,0.11,0.13,0.19,0.27,0.31 2015-03-19 14:55:39,84.431024574,15.802945034,0.16,0.59,0.08,0.12,0.20,0.27,0.33 2015-03-19 14:57:00,84.408921896,16.726131147,0.15,0.36,0.09,0.12,0.18,0.25,0.30 2015-03-19 14:58:22,84.385371051,17.641733922,0.16,0.41,0.09,0.11,0.19,0.27,0.34 2015-03-19 14:59:32,84.3619112094,18.4139287645,0.17,0.38,0.11,0.13,0.19,0.26,0.31 2015-03-19 15:01:22,84.278912912,19.3983578503,0.18,0.45,0.10,0.14,0.21,0.31,0.41 2015-03-19 15:02:42,84.209820873,20.029747522,0.15,0.34,0.09,0.11,0.18,0.25,0.30 2015-03-19 15:04:02,84.131058693,20.561256791,0.15,0.34,0.09,0.12,0.17,0.22,0.25 2015-03-19 15:05:17,84.053310316,21.003478982,0.14,0.37,0.09,0.11,0.16,0.24,0.30 2015-03-19 15:06:31,83.975642105,21.436477216,0.12,0.32,0.08,0.10,0.14,0.20,0.27 2015-03-19 15:07:45,83.89772353,21.859866761,0.16,0.37,0.09,0.11,0.20,0.28,0.33 2015-03-19 15:08:59,83.819230094,22.268262198,0.16,0.40,0.09,0.11,0.19,0.28,0.33 2015-03-19 15:10:14,83.740267183,22.663574892,0.14,0.43,0.08,0.10,0.16,0.21,0.28 2015-03-19 15:11:28,83.660269377,23.036146953,0.16,0.33,0.09,0.13,0.19,0.25,0.30 2015-03-19 15:12:42,83.579078834,23.381227514,0.15,0.34,0.08,0.11,0.18,0.24,0.30 2015-03-19 15:13:55,83.494992681,23.658520493,0.17,0.36,0.08,0.12,0.21,0.28,0.31 2015-03-19 15:15:09,83.410095201,23.916115205,0.16,0.43,0.08,0.12,0.19,0.28,0.34 2015-03-19 15:16:23,83.325359289,24.174352373,0.15,0.50,0.09,0.11,0.18,0.26,0.37 2015-03-19 15:17:36,83.240520168,24.42682146,0.16,0.38,0.06,0.12,0.20,0.26,0.31 2015-03-19 15:18:42,83.1647682025,24.6487468828,0.16,0.43,0.07,0.12,0.19,0.26,0.33