# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20140318.10km.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 2014-03-18 18:20:35,70.1046298971,-139.234555082,0.14,0.51,0.06,0.09,0.18,0.26,0.35 2014-03-18 18:21:49,70.19370784,-139.199706589,0.18,0.46,0.06,0.11,0.24,0.31,0.37 2014-03-18 18:23:04,70.28274906,-139.164546338,0.13,0.44,0.05,0.09,0.17,0.24,0.29 2014-03-18 18:24:21,70.371780478,-139.129021185,0.14,0.77,0.04,0.07,0.19,0.28,0.41 2014-03-18 18:25:38,70.460806657,-139.09324164,0.12,0.38,0.06,0.09,0.15,0.20,0.25 2014-03-18 18:26:55,70.549827237,-139.057159999,0.12,0.41,0.06,0.09,0.14,0.20,0.27 2014-03-18 18:28:12,70.638840856,-139.020759143,0.10,0.57,0.05,0.07,0.13,0.18,0.37 2014-03-18 18:29:28,70.727841671,-138.983920262,0.11,0.36,0.05,0.07,0.13,0.22,0.27 2014-03-18 18:30:44,70.816833926,-138.946732601,0.14,0.37,0.06,0.10,0.17,0.25,0.33 2014-03-18 18:32:00,70.905822439,-138.909309281,0.11,0.30,0.05,0.08,0.14,0.19,0.23 2014-03-18 18:33:17,70.994776146,-138.870914941,0.11,0.30,0.06,0.07,0.14,0.20,0.24 2014-03-18 18:34:34,71.083775173,-138.833359959,0.11,0.30,0.06,0.07,0.14,0.19,0.23 2014-03-18 18:35:51,71.172741063,-138.794903831,0.11,0.40,0.06,0.08,0.13,0.21,0.32 2014-03-18 18:37:08,71.261701333,-138.756153443,0.11,0.44,0.05,0.07,0.13,0.22,0.33 2014-03-18 18:38:26,71.350644112,-138.716845472,0.12,0.42,0.06,0.08,0.15,0.22,0.30 2014-03-18 18:39:43,71.43959392,-138.677483826,0.10,0.29,0.06,0.07,0.12,0.18,0.23 2014-03-18 18:41:01,71.528525051,-138.637536745,0.12,0.31,0.06,0.08,0.15,0.23,0.27 2014-03-18 18:42:19,71.617447735,-138.597219164,0.07,0.26,0.05,0.05,0.08,0.14,0.18 2014-03-18 18:44:05,71.7383520892,-138.541644129,0.08,0.27,0.04,0.05,0.10,0.14,0.17 2014-03-18 18:45:42,71.847453675,-138.491252517,0.09,0.27,0.05,0.07,0.11,0.17,0.21 2014-03-18 18:47:01,71.936350613,-138.449671982,0.11,0.31,0.05,0.06,0.13,0.20,0.24 2014-03-18 18:48:19,72.025231838,-138.407545005,0.09,0.28,0.05,0.06,0.11,0.17,0.21 2014-03-18 18:49:38,72.114114283,-138.365250942,0.12,0.29,0.06,0.08,0.16,0.21,0.27 2014-03-18 18:50:56,72.202979568,-138.322378998,0.17,0.52,0.06,0.11,0.21,0.28,0.35 2014-03-18 18:52:15,72.291828891,-138.278960631,0.11,0.25,0.05,0.07,0.13,0.18,0.21 2014-03-18 18:53:33,72.380676311,-138.235260163,0.17,0.43,0.08,0.12,0.20,0.31,0.36 2014-03-18 18:54:52,72.469514553,-138.191144828,0.14,0.40,0.06,0.11,0.17,0.24,0.31 2014-03-18 18:56:11,72.558337309,-138.146475833,0.15,0.36,0.06,0.10,0.18,0.25,0.33 2014-03-18 18:57:30,72.647155843,-138.101499285,0.16,0.54,0.07,0.10,0.20,0.28,0.39 2014-03-18 18:58:50,72.735965741,-138.056104439,0.14,0.40,0.06,0.08,0.19,0.27,0.34 2014-03-18 19:00:09,72.824740996,-138.009700404,0.11,0.29,0.04,0.07,0.15,0.21,0.26 2014-03-18 19:01:27,72.913522273,-137.963204708,0.15,0.37,0.05,0.09,0.20,0.28,0.33 2014-03-18 19:02:45,73.002302708,-137.916461296,0.14,0.38,0.06,0.10,0.17,0.25,0.30 2014-03-18 19:04:03,73.091016774,-137.868027069,0.13,0.45,0.06,0.09,0.16,0.23,0.31 2014-03-18 19:05:21,73.18066324,-137.820883435,0.11,0.44,0.05,0.07,0.15,0.21,0.30 2014-03-18 19:06:40,73.27247367,-137.771110301,0.11,0.32,0.05,0.07,0.13,0.22,0.27 2014-03-18 19:08:01,73.364341848,-137.720558071,0.12,0.33,0.06,0.08,0.15,0.21,0.27 2014-03-18 19:08:46,73.4161934264,-137.691790953,0.07,0.13,0.05,0.05,0.07,0.11,0.12 2014-03-18 20:40:41,73.667994572,-135.946844115,0.15,0.38,0.08,0.11,0.18,0.28,0.34 2014-03-18 20:42:05,73.742540995,-135.76455184,0.11,0.39,0.04,0.06,0.14,0.26,0.32 2014-03-18 20:43:29,73.816930945,-135.580689709,0.14,0.47,0.05,0.09,0.19,0.26,0.31 2014-03-18 20:44:53,73.8908091,-135.395964278,0.12,0.32,0.05,0.08,0.15,0.21,0.26 2014-03-18 20:46:17,73.96439129,-135.209834907,0.13,0.36,0.07,0.09,0.16,0.22,0.28 2014-03-18 20:47:40,74.03781765,-135.022069085,0.13,0.42,0.06,0.10,0.16,0.22,0.31 2014-03-18 20:49:04,74.111086798,-134.832653151,0.14,0.36,0.08,0.11,0.17,0.24,0.29 2014-03-18 20:50:28,74.184189102,-134.641532456,0.11,0.37,0.04,0.08,0.14,0.23,0.29 2014-03-18 20:51:53,74.257115218,-134.448637049,0.15,0.45,0.07,0.10,0.18,0.25,0.33 2014-03-18 20:53:17,74.329867604,-134.253981326,0.15,0.39,0.07,0.11,0.18,0.24,0.32 2014-03-18 20:54:42,74.402450717,-134.057580301,0.13,0.31,0.04,0.09,0.17,0.23,0.27 2014-03-18 20:56:07,74.474862644,-133.859417888,0.13,0.39,0.06,0.08,0.16,0.25,0.33 2014-03-18 20:57:33,74.547083635,-133.659371522,0.10,0.29,0.04,0.06,0.12,0.17,0.23 2014-03-18 20:58:58,74.619140376,-133.45758615,0.14,0.43,0.07,0.10,0.17,0.26,0.32 2014-03-18 21:00:23,74.691004495,-133.253903771,0.13,0.34,0.07,0.09,0.16,0.20,0.27 2014-03-18 21:01:47,74.762683872,-133.048357324,0.14,0.48,0.05,0.09,0.17,0.29,0.41 2014-03-18 21:03:11,74.834165289,-132.8408756,0.15,0.41,0.07,0.10,0.20,0.27,0.32 2014-03-18 21:04:35,74.905472661,-132.631559066,0.14,0.37,0.06,0.10,0.18,0.24,0.29 2014-03-18 21:06:00,74.976574784,-132.420247337,0.15,0.36,0.07,0.11,0.19,0.25,0.29 2014-03-18 21:07:25,75.047484293,-132.206996792,0.15,0.45,0.08,0.11,0.18,0.26,0.33 2014-03-18 21:08:49,75.118193251,-131.991761304,0.16,0.35,0.08,0.12,0.20,0.25,0.28 2014-03-18 21:10:14,75.188686979,-131.774452108,0.14,0.51,0.08,0.10,0.16,0.22,0.32 2014-03-18 21:11:39,75.258971662,-131.5550959,0.15,0.35,0.08,0.11,0.18,0.25,0.31 2014-03-18 21:13:04,75.329084491,-131.333872866,0.13,0.38,0.08,0.10,0.15,0.21,0.29 2014-03-18 21:14:28,75.39895776,-131.110437218,0.10,0.29,0.04,0.06,0.12,0.17,0.24 2014-03-18 21:15:53,75.468626705,-130.884956811,0.12,0.66,0.04,0.07,0.16,0.26,0.37 2014-03-18 21:17:17,75.538074303,-130.657331903,0.15,0.34,0.08,0.11,0.17,0.23,0.30 2014-03-18 21:18:42,75.607300144,-130.427553995,0.10,0.38,0.04,0.04,0.15,0.25,0.32 2014-03-18 21:20:06,75.676302464,-130.195608413,0.14,0.51,0.06,0.09,0.18,0.30,0.39 2014-03-18 21:21:31,75.74508464,-129.961504777,0.19,0.43,0.09,0.14,0.24,0.32,0.37 2014-03-18 21:22:57,75.814069847,-129.723598463,0.15,0.36,0.08,0.11,0.18,0.25,0.29 2014-03-18 21:24:28,75.886355602,-129.471008233,0.19,0.42,0.10,0.14,0.23,0.29,0.35 2014-03-18 21:25:33,75.9372312035,-129.291135239,0.12,0.36,0.04,0.04,0.19,0.26,0.32 2014-03-18 21:39:38,75.758630638,-126.199183878,0.19,0.48,0.09,0.15,0.23,0.29,0.32 2014-03-18 21:40:55,75.668903624,-126.14161712,0.22,0.58,0.09,0.14,0.28,0.39,0.47 2014-03-18 21:42:12,75.579176002,-126.084926343,0.23,0.72,0.04,0.14,0.31,0.43,0.55 2014-03-18 21:43:28,75.490123301,-126.029407509,0.05,0.14,0.04,0.04,0.04,0.08,0.12 2014-03-18 21:44:45,75.401348842,-125.974729599,0.15,0.56,0.04,0.05,0.22,0.33,0.46 2014-03-18 21:46:01,75.312563727,-125.920657189,0.21,0.68,0.08,0.12,0.28,0.44,0.53 2014-03-18 21:47:17,75.2237656,-125.867242709,0.29,0.74,0.16,0.22,0.35,0.47,0.61 2014-03-18 21:48:33,75.134952382,-125.814541683,0.25,0.67,0.13,0.19,0.30,0.40,0.55 2014-03-18 21:49:50,75.046131102,-125.762308421,0.20,0.78,0.10,0.15,0.23,0.37,0.53 2014-03-18 21:51:07,74.95729788,-125.710704207,0.21,0.58,0.10,0.15,0.25,0.33,0.42 2014-03-18 21:52:23,74.868454422,-125.659662283,0.22,0.52,0.13,0.18,0.26,0.33,0.41 2014-03-18 21:53:40,74.779593253,-125.609373532,0.29,0.72,0.16,0.23,0.34,0.48,0.57 2014-03-18 21:54:56,74.690723522,-125.559600031,0.25,0.60,0.13,0.18,0.31,0.46,0.52 2014-03-18 21:56:12,74.601805044,-125.510276269,0.19,0.63,0.07,0.11,0.25,0.41,0.53 2014-03-18 21:57:28,74.512657534,-125.461421448,0.15,0.56,0.07,0.10,0.19,0.31,0.43 2014-03-18 21:58:45,74.423484245,-125.4132139,0.14,0.53,0.07,0.09,0.17,0.25,0.37 2014-03-18 22:00:02,74.3343062977,-125.365236279,0.11,0.37,0.04,0.06,0.14,0.25,0.32 2014-03-18 22:01:19,74.244198829,-125.370093813,0.07,0.35,0.04,0.05,0.07,0.16,0.28 2014-03-18 22:02:38,74.153638893,-125.42376803,0.04,0.05,0.04,0.04,0.05,0.05,0.05 2014-03-18 22:03:54,74.064675313,-125.472584633,0.05,0.07,0.04,0.04,0.05,0.06,0.06 2014-03-18 22:05:11,73.975829595,-125.52078943,0.05,0.08,0.04,0.05,0.06,0.06,0.07 2014-03-18 22:06:28,73.886971491,-125.568428554,0.05,0.08,0.04,0.04,0.05,0.06,0.07 2014-03-18 22:07:44,73.798106882,-125.615647404,0.04,0.06,0.04,0.04,0.05,0.05,0.06 2014-03-18 22:09:00,73.70923218,-125.662352323,0.05,0.06,0.04,0.04,0.05,0.05,0.06 2014-03-18 22:10:17,73.620347645,-125.708601151,0.04,0.05,0.04,0.04,0.04,0.05,0.05 2014-03-18 22:11:34,73.531447604,-125.754233465,0.04,0.07,0.04,0.04,0.04,0.05,0.05 2014-03-18 22:12:51,73.442541186,-125.799463172,0.05,0.07,0.04,0.04,0.05,0.05,0.06 2014-03-18 22:14:07,73.35362666,-125.844256907,0.09,0.33,0.04,0.05,0.10,0.23,0.29 2014-03-18 22:15:24,73.264705883,-125.888660201,0.07,0.30,0.04,0.05,0.08,0.14,0.18 2014-03-18 22:16:40,73.175776534,-125.932656785,0.09,0.22,0.04,0.06,0.12,0.17,0.19 2014-03-18 22:17:56,73.086833572,-125.9760882,0.12,0.25,0.06,0.08,0.15,0.18,0.20 2014-03-18 22:19:11,72.997879034,-126.019011951,0.14,0.28,0.06,0.10,0.17,0.21,0.23 2014-03-18 22:20:27,72.908914511,-126.061468812,0.10,0.35,0.04,0.06,0.13,0.21,0.28 2014-03-18 22:21:43,72.819943122,-126.103529343,0.10,0.52,0.04,0.04,0.14,0.29,0.42 2014-03-18 22:23:01,72.730964148,-126.145217275,0.05,0.08,0.04,0.04,0.05,0.05,0.07 2014-03-18 22:24:20,72.64197854,-126.186541555,0.04,0.06,0.04,0.04,0.05,0.05,0.05 2014-03-18 22:25:38,72.552982677,-126.227409906,0.04,0.06,0.04,0.04,0.05,0.05,0.05 2014-03-18 22:26:56,72.46397767,-126.26784561,0.05,0.06,0.04,0.04,0.05,0.05,0.06 2014-03-18 22:28:13,72.374864681,-126.308057712,0.04,0.06,0.04,0.04,0.05,0.05,0.05 2014-03-18 22:29:33,72.282869562,-126.349044799,0.04,0.06,0.04,0.04,0.05,0.05,0.06 2014-03-18 22:30:53,72.18956954,-126.390149412,0.05,0.06,0.04,0.04,0.05,0.05,0.05 2014-03-18 22:31:43,72.1324195244,-126.415132707,0.04,0.05,0.04,0.04,0.05,0.05,0.05 2014-03-18 22:43:31,71.852487779,-128.788367815,0.11,0.67,0.05,0.07,0.14,0.23,0.34 2014-03-18 23:20:53,70.5860482122,-135.833890365,0.16,0.47,0.05,0.10,0.21,0.29,0.36 2014-03-18 23:22:54,70.4838502638,-136.128412102,0.18,0.41,0.10,0.13,0.21,0.29,0.37 2014-03-18 23:24:11,70.418121419,-136.314900865,0.08,0.21,0.05,0.06,0.10,0.16,0.19 2014-03-18 23:25:26,70.352794901,-136.498584867,0.09,0.28,0.05,0.07,0.10,0.15,0.19 2014-03-18 23:26:42,70.287288161,-136.68111232,0.13,0.39,0.05,0.08,0.16,0.23,0.31 2014-03-18 23:27:58,70.221563945,-136.862364789,0.09,0.43,0.05,0.06,0.10,0.16,0.24 2014-03-18 23:29:14,70.15569299,-137.042580266,0.11,0.49,0.05,0.06,0.13,0.25,0.36 2014-03-18 23:30:30,70.089563069,-137.221396949,0.09,0.42,0.05,0.06,0.10,0.23,0.31 2014-03-18 23:31:47,70.023358502,-137.399404724,0.12,0.38,0.06,0.08,0.15,0.24,0.29 2014-03-18 23:33:04,69.95695612,-137.576213305,0.12,0.34,0.05,0.07,0.15,0.23,0.29 2014-03-18 23:34:21,69.8904662969,-137.752178735,0.09,0.27,0.05,0.06,0.11,0.16,0.23 2014-03-18 23:35:10,69.8483023783,-137.86342561,0.09,0.20,0.05,0.06,0.12,0.17,0.19