# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20180403.10km.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 2018-04-03 13:02:00,83.9348776763,-24.4388061565,0.16,0.71,0.04,0.07,0.22,0.41,0.47 2018-04-03 13:06:21,84.0624698177,-21.8737202854,0.16,0.46,0.08,0.11,0.20,0.28,0.40 2018-04-03 13:07:17,84.08815205,-21.309385257,0.19,0.53,0.08,0.13,0.23,0.34,0.44 2018-04-03 13:08:35,84.123503231,-20.505191125,0.16,0.40,0.08,0.12,0.19,0.25,0.32 2018-04-03 13:09:15,84.1410885882,-20.0927774706,0.14,0.21,0.07,0.10,0.19,0.20,0.21 2018-04-03 13:14:03,84.2599955322,-17.0017288969,0.15,0.29,0.08,0.12,0.19,0.24,0.27 2018-04-03 13:15:03,84.2823821334,-16.3484207031,0.14,0.34,0.07,0.10,0.17,0.24,0.29 2018-04-03 13:16:23,84.3113157119,-15.4635113449,0.14,0.58,0.09,0.11,0.17,0.22,0.25 2018-04-03 13:17:39,84.337388141,-14.619439561,0.14,0.39,0.09,0.11,0.17,0.23,0.28 2018-04-03 13:18:58,84.362880183,-13.744499142,0.14,0.40,0.10,0.12,0.17,0.22,0.25 2018-04-03 13:20:16,84.3870462865,-12.8618503804,0.13,0.37,0.04,0.09,0.16,0.22,0.28 2018-04-03 13:21:35,84.409854353,-11.97168176,0.13,0.27,0.08,0.10,0.15,0.20,0.25 2018-04-03 13:22:54,84.43143283,-11.074573844,0.14,0.30,0.07,0.11,0.16,0.22,0.26 2018-04-03 13:24:22,84.4536850518,-10.0695034735,0.13,0.67,0.05,0.10,0.16,0.23,0.29 2018-04-03 13:25:33,84.467704445,-9.257151783,0.16,0.41,0.09,0.12,0.20,0.29,0.36 2018-04-03 13:26:53,84.486750786,-8.345771133,0.15,0.48,0.09,0.11,0.18,0.26,0.34 2018-04-03 13:28:14,84.503049239,-7.424826945,0.18,0.59,0.06,0.11,0.24,0.34,0.45 2018-04-03 13:29:34,84.517510708,-6.498061651,0.15,0.34,0.09,0.12,0.18,0.24,0.30 2018-04-03 13:30:55,84.530571806,-5.56676248,0.14,0.34,0.08,0.11,0.17,0.23,0.27 2018-04-03 13:32:16,84.542219862,-4.63128628,0.15,0.35,0.08,0.11,0.18,0.24,0.28 2018-04-03 13:33:38,84.5524251,-3.692053719,0.18,0.46,0.10,0.13,0.21,0.30,0.37 2018-04-03 13:35:01,84.56116096,-2.749537818,0.16,0.47,0.06,0.11,0.20,0.27,0.34 2018-04-03 13:36:24,84.568423733,-1.804247117,0.20,0.50,0.09,0.12,0.26,0.40,0.46 2018-04-03 13:37:47,84.574210142,-0.856686121,0.16,0.45,0.08,0.11,0.19,0.25,0.29 2018-04-03 13:39:09,84.57853079,0.092626869,0.16,0.37,0.06,0.12,0.21,0.28,0.32 2018-04-03 13:40:32,84.581356179,1.043188714,0.17,0.39,0.08,0.12,0.21,0.28,0.33 2018-04-03 13:41:55,84.58270203,1.99448493,0.10,0.24,0.04,0.08,0.12,0.17,0.22 2018-04-03 13:43:18,84.582568548,2.945979914,0.11,0.31,0.04,0.08,0.13,0.17,0.20 2018-04-03 13:44:41,84.5809801024,3.89717892407,0.13,0.48,0.04,0.08,0.16,0.26,0.38 2018-04-03 13:46:05,84.57789888,4.847560355,0.13,0.38,0.07,0.09,0.15,0.22,0.30 2018-04-03 13:47:28,84.573317727,5.796598246,0.13,0.41,0.07,0.09,0.16,0.21,0.26 2018-04-03 13:48:52,84.567272048,6.743792175,0.14,0.32,0.05,0.10,0.17,0.23,0.30 2018-04-03 13:50:15,84.559749144,7.688617754,0.12,0.32,0.07,0.09,0.14,0.19,0.23 2018-04-03 13:51:38,84.550752017,8.630575146,0.13,0.33,0.07,0.09,0.16,0.24,0.28 2018-04-03 13:53:02,84.540297453,9.569214036,0.12,0.38,0.06,0.08,0.14,0.22,0.28 2018-04-03 13:54:25,84.528382729,10.504002645,0.13,0.31,0.07,0.10,0.15,0.21,0.25 2018-04-03 13:55:47,84.515016723,11.434483811,0.12,0.28,0.07,0.09,0.14,0.20,0.23 2018-04-03 13:57:10,84.500241729,12.360255876,0.13,0.28,0.07,0.10,0.15,0.19,0.24 2018-04-03 13:58:34,84.484029385,13.280811625,0.12,0.30,0.07,0.09,0.14,0.20,0.26 2018-04-03 13:59:57,84.46647192,14.195893799,0.15,0.32,0.09,0.12,0.17,0.22,0.25 2018-04-03 14:01:20,84.448058409,15.106254045,0.13,0.44,0.07,0.09,0.15,0.21,0.28 2018-04-03 14:02:43,84.429829679,16.014124629,0.13,0.46,0.06,0.10,0.15,0.23,0.31 2018-04-03 14:04:07,84.406718134,16.905766729,0.11,0.43,0.06,0.08,0.12,0.18,0.26 2018-04-03 14:05:31,84.381842987,17.789587219,0.11,0.35,0.07,0.09,0.13,0.19,0.26 2018-04-03 14:06:54,84.357211959,18.669991392,0.10,0.30,0.07,0.08,0.12,0.17,0.23 2018-04-03 14:08:17,84.331433968,19.54301813,0.11,0.26,0.07,0.08,0.14,0.18,0.22 2018-04-03 14:09:41,84.304404056,20.408291452,0.11,0.29,0.04,0.07,0.14,0.21,0.25 2018-04-03 14:11:05,84.276083989,21.265177594,0.11,0.28,0.06,0.08,0.13,0.18,0.22 2018-04-03 14:12:29,84.246513553,22.11350564,0.10,0.33,0.06,0.07,0.13,0.18,0.21 2018-04-03 14:13:53,84.215710189,22.953026648,0.09,0.22,0.06,0.07,0.10,0.15,0.18 2018-04-03 14:15:17,84.183716396,23.783623877,0.11,0.30,0.04,0.08,0.13,0.17,0.23 2018-04-03 14:16:41,84.1506075677,24.6020322706,0.12,0.31,0.06,0.09,0.15,0.20,0.24 2018-04-03 14:18:05,84.116075845,25.416669499,0.13,0.28,0.07,0.09,0.16,0.21,0.24 2018-04-03 14:19:30,84.080499965,26.218901942,0.11,0.34,0.05,0.07,0.14,0.20,0.27 2018-04-03 14:20:54,84.043788231,27.011441938,0.11,0.27,0.06,0.07,0.13,0.20,0.23 2018-04-03 14:22:18,84.005971053,27.794232324,0.10,0.30,0.03,0.07,0.14,0.20,0.24 2018-04-03 14:23:28,83.9740649907,28.4308588884,0.09,0.26,0.05,0.07,0.10,0.15,0.18 2018-04-03 14:33:59,83.739673862,25.529058024,0.11,0.25,0.06,0.08,0.13,0.18,0.21 2018-04-03 14:35:21,83.700376981,24.790520505,0.09,0.33,0.03,0.04,0.12,0.19,0.28 2018-04-03 14:36:44,83.660076947,24.061178854,0.09,0.25,0.04,0.06,0.11,0.16,0.20 2018-04-03 14:38:06,83.618753826,23.341200389,0.08,0.20,0.03,0.04,0.10,0.14,0.18 2018-04-03 14:39:28,83.576469602,22.630430479,0.09,0.33,0.04,0.06,0.10,0.16,0.22 2018-04-03 14:40:50,83.533191214,21.929179488,0.10,0.41,0.04,0.07,0.11,0.16,0.22 2018-04-03 14:42:11,83.488986274,21.237170047,0.08,0.22,0.03,0.04,0.11,0.15,0.18 2018-04-03 14:43:33,83.443831246,20.554675916,0.10,0.22,0.04,0.08,0.12,0.16,0.18 2018-04-03 14:44:54,83.397774484,19.881515939,0.11,0.23,0.06,0.08,0.13,0.18,0.21 2018-04-03 14:46:15,83.350826796,19.217740297,0.10,0.24,0.06,0.07,0.12,0.17,0.20 2018-04-03 14:47:37,83.303004666,18.563328103,0.13,0.28,0.07,0.10,0.16,0.20,0.24 2018-04-03 14:48:57,83.254333832,17.91821573,0.09,0.31,0.04,0.06,0.11,0.16,0.23 2018-04-03 14:50:20,83.2038334073,17.2699408077,0.09,0.38,0.04,0.04,0.12,0.17,0.26 2018-04-03 14:51:42,83.152766717,16.634723557,0.08,0.19,0.04,0.05,0.10,0.14,0.16 2018-04-03 14:53:03,83.101602951,16.017640326,0.11,0.61,0.04,0.08,0.13,0.17,0.25 2018-04-03 14:54:23,83.049675766,15.409605007,0.09,0.17,0.05,0.07,0.11,0.14,0.16 2018-04-03 14:55:44,82.996967303,14.810717127,0.12,0.35,0.07,0.09,0.15,0.21,0.26 2018-04-03 14:57:05,82.9435292687,14.2206922656,0.09,0.21,0.05,0.07,0.12,0.16,0.18 2018-04-03 14:58:25,82.8893479602,13.6396319681,0.10,0.38,0.05,0.07,0.12,0.18,0.23 2018-04-03 14:59:46,82.834458053,13.067343471,0.10,0.36,0.04,0.07,0.13,0.17,0.24 2018-04-03 15:01:06,82.778874822,12.503771186,0.13,0.39,0.04,0.09,0.16,0.21,0.26 2018-04-03 15:02:26,82.72260302,11.948888465,0.13,0.30,0.07,0.10,0.15,0.20,0.28 2018-04-03 15:03:47,82.6656757256,11.4024688516,0.12,0.40,0.04,0.09,0.14,0.20,0.23 2018-04-03 15:05:07,82.608075983,10.864581906,0.11,0.37,0.05,0.09,0.13,0.19,0.23 2018-04-03 15:06:27,82.54986621,10.334850798,0.15,0.39,0.08,0.11,0.19,0.29,0.34 2018-04-03 15:07:48,82.491034439,9.813348554,0.13,0.26,0.06,0.10,0.16,0.20,0.22 2018-04-03 15:09:09,82.4318043831,9.30180296685,0.11,0.26,0.04,0.09,0.14,0.18,0.21 2018-04-03 15:10:29,82.3715552557,8.79450556228,0.08,0.26,0.04,0.04,0.11,0.17,0.23 2018-04-03 15:11:50,82.31082093,8.298087513,0.13,0.28,0.07,0.10,0.15,0.20,0.23 2018-04-03 15:13:11,82.2494589287,7.80964715455,0.13,0.37,0.08,0.11,0.16,0.20,0.23 2018-04-03 15:14:32,82.187792067,7.327176794,0.15,0.28,0.04,0.13,0.17,0.22,0.26 2018-04-03 15:15:53,82.125532197,6.8527534,0.13,0.27,0.04,0.10,0.16,0.20,0.24 2018-04-03 15:17:14,82.0627626395,6.3855207531,0.08,0.27,0.03,0.04,0.13,0.18,0.21 2018-04-03 15:18:35,81.9994456316,5.92582748855,0.11,0.25,0.04,0.05,0.16,0.20,0.23 2018-04-03 15:19:56,81.935578791,5.473707783,0.18,0.35,0.12,0.15,0.20,0.25,0.30 2018-04-03 15:21:18,81.871266161,5.028407593,0.15,0.33,0.09,0.13,0.17,0.21,0.25 2018-04-03 15:22:39,81.8065209323,4.58973965073,0.10,0.34,0.04,0.04,0.16,0.22,0.29 2018-04-03 15:24:01,81.7412440453,4.15840789278,0.13,0.36,0.05,0.11,0.15,0.19,0.22 2018-04-03 15:25:23,81.675537852,3.733639837,0.09,0.24,0.04,0.04,0.12,0.15,0.19 2018-04-03 15:26:45,81.609411632,3.315343326,0.13,0.28,0.08,0.11,0.15,0.19,0.23 2018-04-03 15:28:06,81.542839094,2.90363196,0.08,0.25,0.04,0.04,0.11,0.19,0.22 2018-04-03 15:29:27,81.475847189,2.498278275,0.13,0.34,0.05,0.10,0.16,0.23,0.28 2018-04-03 15:30:48,81.4084471,2.099193654,0.12,0.25,0.04,0.09,0.14,0.18,0.21 2018-04-03 15:32:08,81.340607701,1.706565057,0.11,0.27,0.07,0.09,0.12,0.16,0.21 2018-04-03 15:33:28,81.272401976,1.319805472,0.11,0.26,0.04,0.07,0.13,0.20,0.23 2018-04-03 15:34:49,81.203828127,0.938866606,0.12,0.35,0.07,0.10,0.14,0.19,0.24 2018-04-03 15:36:06,81.1385352563,0.584161972193,0.07,0.24,0.04,0.04,0.10,0.16,0.21 2018-04-03 15:37:31,81.0654882377,0.19503460856,0.08,0.26,0.03,0.04,0.11,0.17,0.22 2018-04-03 15:38:53,80.9952774224,-0.166289780212,0.09,0.21,0.04,0.05,0.12,0.16,0.18 2018-04-03 15:39:34,80.9592891579,-0.344649368421,0.04,0.05,0.04,0.04,0.04,0.05,0.05 2018-04-03 15:45:15,80.9705654953,-2.4319694866,0.06,0.31,0.03,0.04,0.05,0.14,0.22 2018-04-03 15:46:40,80.997791539,-2.978247053,0.11,0.29,0.04,0.06,0.14,0.19,0.22 2018-04-03 15:48:04,81.024067497,-3.528061106,0.15,0.42,0.08,0.11,0.18,0.24,0.33 2018-04-03 15:49:28,81.049594438,-4.080808551,0.14,0.29,0.06,0.11,0.17,0.21,0.25 2018-04-03 15:50:52,81.074318353,-4.636631952,0.11,0.30,0.05,0.07,0.13,0.20,0.24 2018-04-03 15:52:16,81.0981397514,-5.19558547665,0.09,0.39,0.04,0.04,0.14,0.26,0.34 2018-04-03 15:53:39,81.1211881015,-5.75703648916,0.04,0.10,0.04,0.04,0.05,0.06,0.07 2018-04-03 15:55:02,81.143352928,-6.321933867,0.15,0.40,0.06,0.10,0.18,0.26,0.33 2018-04-03 15:56:26,81.164793629,-6.889178884,0.17,0.41,0.08,0.12,0.21,0.30,0.36 2018-04-03 15:57:48,81.1854918321,-7.45894965294,0.16,0.47,0.04,0.09,0.21,0.29,0.35 2018-04-03 15:59:11,81.2053293493,-8.03134885611,0.18,0.59,0.04,0.14,0.22,0.31,0.41 2018-04-03 16:00:32,81.2243045662,-8.60624786355,0.26,0.75,0.08,0.18,0.34,0.45,0.51 2018-04-03 16:01:54,81.2423791252,-9.1836023045,0.19,0.60,0.04,0.12,0.24,0.37,0.46 2018-04-03 16:03:15,81.25961145,-9.763218638,0.20,0.59,0.05,0.14,0.24,0.39,0.52 2018-04-03 16:04:37,81.2759496783,-10.3452412721,0.24,0.61,0.04,0.14,0.34,0.47,0.55 2018-04-03 16:05:59,81.291393631,-10.929022581,0.26,0.60,0.05,0.21,0.34,0.44,0.51 2018-04-03 16:07:05,81.3030911107,-11.3991345669,0.07,0.88,0.05,0.05,0.06,0.07,0.49