# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20140328.10km.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 2014-03-28 12:28:18,80.581701297,-97.25631438,0.38,0.89,0.18,0.28,0.46,0.61,0.76 2014-03-28 12:29:36,80.613507397,-97.770687478,0.41,0.90,0.22,0.32,0.50,0.61,0.69 2014-03-28 12:30:52,80.639631633,-98.298496167,0.37,0.81,0.18,0.29,0.45,0.56,0.67 2014-03-28 12:32:09,80.665079372,-98.829081368,0.38,0.74,0.18,0.28,0.46,0.60,0.68 2014-03-28 12:33:26,80.692585048,-99.357104158,0.27,1.00,0.11,0.17,0.33,0.53,0.73 2014-03-28 12:34:44,80.719646831,-99.887568493,0.30,0.67,0.12,0.20,0.40,0.53,0.61 2014-03-28 12:36:02,80.745677557,-100.421408864,0.36,0.92,0.13,0.23,0.46,0.68,0.82 2014-03-28 12:37:20,80.771130786,-100.957792843,0.36,0.91,0.15,0.24,0.46,0.62,0.76 2014-03-28 12:38:38,80.795605735,-101.497438657,0.34,0.68,0.20,0.28,0.39,0.51,0.60 2014-03-28 12:39:56,80.819465888,-102.039558503,0.24,1.25,0.11,0.14,0.29,0.46,0.60 2014-03-28 12:41:14,80.842264169,-102.584840191,0.23,0.83,0.10,0.16,0.28,0.41,0.59 2014-03-28 12:42:31,80.86447522,-103.132386456,0.30,0.66,0.16,0.23,0.36,0.47,0.55 2014-03-28 12:43:49,80.885779736,-103.682674329,0.27,0.87,0.10,0.19,0.33,0.48,0.64 2014-03-28 12:45:07,80.906100819,-104.235693122,0.26,0.78,0.10,0.16,0.34,0.47,0.60 2014-03-28 12:46:25,80.925781152,-104.790843219,0.31,0.86,0.17,0.22,0.38,0.57,0.67 2014-03-28 12:47:42,80.94457819,-105.348389364,0.28,0.82,0.14,0.21,0.33,0.48,0.59 2014-03-28 12:49:00,80.962527617,-105.908175654,0.29,0.74,0.08,0.20,0.37,0.53,0.67 2014-03-28 12:50:18,80.979617925,-106.470134481,0.29,0.77,0.12,0.19,0.36,0.52,0.64 2014-03-28 12:51:35,80.995861209,-107.034149506,0.32,0.76,0.17,0.25,0.37,0.49,0.60 2014-03-28 12:52:53,81.011255851,-107.600118761,0.31,0.72,0.16,0.23,0.37,0.49,0.60 2014-03-28 12:54:11,81.025734106,-108.168008652,0.27,0.67,0.14,0.20,0.32,0.44,0.53 2014-03-28 12:55:29,81.039380756,-108.737630406,0.27,0.82,0.12,0.20,0.33,0.44,0.53 2014-03-28 12:56:47,81.052153367,-109.308928796,0.21,0.76,0.08,0.15,0.25,0.37,0.57 2014-03-28 12:58:05,81.064044231,-109.881788067,0.23,0.64,0.08,0.13,0.30,0.46,0.60 2014-03-28 12:59:23,81.075015425,-110.456131033,0.25,0.90,0.10,0.17,0.32,0.44,0.62 2014-03-28 13:00:42,81.085170093,-111.031771114,0.24,0.76,0.13,0.17,0.29,0.44,0.66 2014-03-28 13:02:00,81.094324991,-111.608723372,0.20,0.70,0.09,0.13,0.25,0.35,0.44 2014-03-28 13:03:19,81.102415741,-112.1869074,0.22,0.60,0.08,0.14,0.28,0.41,0.51 2014-03-28 13:04:37,81.109934029,-112.765910503,0.25,0.71,0.11,0.18,0.30,0.44,0.60 2014-03-28 13:05:56,81.116524406,-113.345842865,0.26,0.66,0.10,0.19,0.33,0.46,0.53 2014-03-28 13:07:15,81.122163584,-113.926588695,0.18,0.59,0.08,0.10,0.23,0.37,0.46 2014-03-28 13:08:34,81.12693911,-114.507990514,0.22,0.67,0.09,0.14,0.28,0.40,0.54 2014-03-28 13:09:54,81.130814666,-115.089962166,0.19,0.52,0.10,0.13,0.24,0.33,0.41 2014-03-28 13:11:14,81.133758706,-115.672388716,0.19,0.61,0.09,0.13,0.24,0.37,0.50 2014-03-28 13:12:34,81.135857666,-116.255131541,0.25,0.66,0.10,0.17,0.31,0.42,0.53 2014-03-28 13:13:55,81.137026275,-116.838090026,0.23,0.52,0.12,0.17,0.27,0.36,0.46 2014-03-28 13:15:16,81.13695172,-117.421126314,0.26,0.91,0.11,0.18,0.32,0.48,0.62 2014-03-28 13:16:37,81.136370245,-118.00414401,0.23,0.63,0.10,0.15,0.30,0.42,0.52 2014-03-28 13:17:58,81.13486363,-118.587019042,0.27,0.63,0.11,0.18,0.34,0.45,0.53 2014-03-28 13:19:20,81.132357684,-119.169616714,0.25,0.65,0.11,0.17,0.31,0.42,0.54 2014-03-28 13:20:41,81.129017893,-119.751845729,0.22,0.72,0.08,0.14,0.29,0.44,0.60 2014-03-28 13:22:02,81.124712225,-120.333555298,0.22,0.70,0.11,0.16,0.27,0.37,0.56 2014-03-28 13:23:23,81.119572778,-120.914680637,0.22,0.70,0.10,0.15,0.28,0.39,0.50 2014-03-28 13:24:45,81.113475915,-121.495052413,0.27,0.80,0.11,0.17,0.33,0.58,0.71 2014-03-28 13:26:07,81.106510645,-122.074591058,0.24,0.65,0.09,0.16,0.30,0.44,0.52 2014-03-28 13:27:30,81.09866927,-122.653180617,0.21,0.65,0.10,0.15,0.26,0.38,0.49 2014-03-28 13:28:52,81.089893868,-123.230674196,0.24,0.71,0.11,0.17,0.29,0.44,0.58 2014-03-28 13:30:14,81.080256989,-123.807010063,0.19,0.70,0.09,0.14,0.24,0.34,0.46 2014-03-28 13:31:34,81.069710808,-124.382033566,0.22,0.68,0.09,0.14,0.28,0.44,0.55 2014-03-28 13:32:54,81.058352144,-124.955713791,0.24,0.62,0.11,0.17,0.30,0.40,0.46 2014-03-28 13:34:13,81.046078806,-125.527858802,0.23,0.60,0.11,0.16,0.29,0.37,0.50 2014-03-28 13:35:33,81.032949391,-126.098433477,0.21,0.60,0.10,0.13,0.27,0.38,0.47 2014-03-28 13:36:53,81.018898642,-126.667234217,0.22,0.71,0.10,0.16,0.25,0.38,0.48 2014-03-28 13:38:12,81.00401538,-127.234256922,0.20,0.85,0.10,0.14,0.23,0.36,0.50 2014-03-28 13:39:31,80.988166715,-127.799245788,0.22,0.56,0.11,0.16,0.27,0.36,0.46 2014-03-28 13:40:50,80.971431475,-128.362177758,0.26,0.65,0.11,0.19,0.33,0.44,0.54 2014-03-28 13:42:09,80.953899093,-128.92304599,0.23,0.63,0.12,0.16,0.27,0.42,0.58 2014-03-28 13:43:28,80.9356746429,-129.481946957,0.24,0.59,0.12,0.18,0.30,0.40,0.49 2014-03-28 13:44:47,80.916461875,-130.038370942,0.25,0.57,0.12,0.18,0.31,0.40,0.51 2014-03-28 13:46:07,80.896357532,-130.592333807,0.19,0.61,0.11,0.15,0.22,0.34,0.42 2014-03-28 13:47:26,80.875611174,-131.144117264,0.21,0.64,0.12,0.16,0.24,0.38,0.46 2014-03-28 13:48:46,80.853942282,-131.693223351,0.19,0.74,0.11,0.15,0.22,0.31,0.50 2014-03-28 13:50:07,80.831472979,-132.239743424,0.19,0.52,0.11,0.15,0.23,0.31,0.39 2014-03-28 13:51:27,80.808148652,-132.783497963,0.19,0.48,0.10,0.14,0.22,0.31,0.40 2014-03-28 13:52:48,80.784031465,-133.324504547,0.15,0.39,0.09,0.11,0.18,0.25,0.30 2014-03-28 13:54:09,80.75913214,-133.862700432,0.16,0.49,0.09,0.11,0.18,0.27,0.37 2014-03-28 13:55:31,80.733386405,-134.39789931,0.17,0.56,0.08,0.12,0.21,0.31,0.38 2014-03-28 13:56:53,80.706913751,-134.930233016,0.18,0.45,0.11,0.14,0.21,0.28,0.33 2014-03-28 13:58:16,80.67957837,-135.459365482,0.18,0.37,0.11,0.14,0.21,0.27,0.32 2014-03-28 13:59:38,80.651421395,-135.985291869,0.24,0.51,0.12,0.18,0.29,0.41,0.46 2014-03-28 14:01:01,80.622586197,-136.508237063,0.19,0.51,0.10,0.14,0.23,0.33,0.40 2014-03-28 14:02:22,80.592926136,-137.027833494,0.17,0.58,0.09,0.13,0.20,0.28,0.37 2014-03-28 14:03:38,80.562541902,-137.544218716,0.18,0.47,0.08,0.12,0.23,0.31,0.37 2014-03-28 14:04:53,80.531462278,-138.057397989,0.19,0.55,0.09,0.14,0.24,0.35,0.40 2014-03-28 14:06:08,80.499550882,-138.566996607,0.17,0.42,0.09,0.12,0.20,0.28,0.35 2014-03-28 14:07:24,80.466972185,-139.073324156,0.15,0.35,0.08,0.11,0.18,0.25,0.28 2014-03-28 14:08:41,80.433674427,-139.576216228,0.16,0.48,0.07,0.11,0.21,0.29,0.36 2014-03-28 14:09:58,80.399653317,-140.075614065,0.19,0.51,0.10,0.14,0.24,0.33,0.39 2014-03-28 14:11:15,80.364901608,-140.571429631,0.17,0.38,0.08,0.13,0.21,0.27,0.33 2014-03-28 14:12:16,80.3366264124,-140.965352948,0.17,0.43,0.09,0.13,0.21,0.29,0.37 2014-03-28 14:21:11,79.7754455932,-141.860837241,0.17,0.57,0.07,0.12,0.22,0.30,0.37 2014-03-28 14:30:32,79.189513058,-140.693724938,0.20,0.63,0.09,0.14,0.24,0.35,0.47 2014-03-28 14:31:45,79.165820761,-140.226157583,0.16,0.38,0.09,0.13,0.19,0.25,0.31 2014-03-28 14:33:01,79.141631452,-139.760141091,0.16,0.45,0.07,0.10,0.20,0.29,0.37 2014-03-28 14:34:18,79.116812444,-139.29799274,0.17,0.52,0.08,0.13,0.21,0.28,0.39 2014-03-28 14:35:36,79.091472184,-138.841899726,0.15,0.36,0.08,0.11,0.18,0.26,0.32 2014-03-28 14:36:54,79.06537854,-138.388209754,0.16,0.37,0.10,0.13,0.19,0.27,0.32 2014-03-28 14:38:13,79.038727091,-137.936504189,0.16,0.44,0.05,0.12,0.19,0.27,0.33 2014-03-28 14:39:31,79.011386171,-137.487039128,0.14,0.36,0.05,0.11,0.19,0.24,0.30 2014-03-28 14:40:50,78.983391316,-137.039803004,0.13,0.42,0.05,0.06,0.17,0.28,0.37 2014-03-28 14:42:09,78.954737546,-136.594837743,0.21,0.52,0.13,0.17,0.24,0.33,0.40 2014-03-28 14:43:28,78.925427626,-136.152190651,0.20,0.57,0.09,0.15,0.25,0.34,0.45 2014-03-28 14:44:46,78.895498118,-135.711837589,0.21,0.53,0.10,0.15,0.25,0.35,0.45 2014-03-28 14:46:04,78.864919856,-135.273872833,0.16,0.48,0.08,0.12,0.19,0.29,0.37 2014-03-28 14:47:23,78.833735511,-134.838257559,0.20,0.68,0.11,0.15,0.24,0.31,0.37 2014-03-28 14:48:40,78.801897645,-134.405107972,0.17,0.43,0.06,0.08,0.24,0.32,0.38 2014-03-28 14:49:58,78.769458997,-133.974367745,0.19,0.46,0.06,0.12,0.25,0.36,0.43 2014-03-28 14:51:16,78.736433386,-133.54604413,0.21,0.77,0.08,0.13,0.28,0.41,0.52 2014-03-28 14:52:34,78.702770222,-133.12027478,0.19,0.46,0.10,0.15,0.22,0.32,0.41 2014-03-28 14:53:52,78.668484147,-132.697057308,0.22,0.52,0.10,0.16,0.27,0.36,0.45 2014-03-28 14:55:10,78.633661723,-132.276245947,0.13,0.41,0.07,0.10,0.16,0.23,0.30 2014-03-28 14:56:29,78.598201481,-131.858095229,0.15,0.41,0.07,0.11,0.19,0.28,0.33 2014-03-28 14:57:47,78.562154863,-131.442522572,0.17,0.45,0.10,0.13,0.20,0.28,0.39 2014-03-28 14:59:04,78.525573013,-131.029441332,0.17,0.51,0.08,0.13,0.21,0.30,0.36 2014-03-28 15:00:22,78.488020936,-130.619898344,0.19,0.55,0.09,0.13,0.23,0.34,0.43 2014-03-28 15:01:40,78.450324225,-130.211994489,0.21,0.59,0.10,0.16,0.26,0.33,0.41 2014-03-28 15:02:57,78.411986703,-129.806898188,0.22,0.52,0.10,0.15,0.27,0.39,0.46 2014-03-28 15:04:15,78.373094638,-129.404445128,0.20,0.47,0.11,0.15,0.23,0.30,0.36 2014-03-28 15:05:33,78.333665046,-129.00461823,0.16,0.38,0.08,0.11,0.19,0.27,0.34 2014-03-28 15:06:51,78.293637567,-128.607584227,0.18,0.66,0.09,0.12,0.23,0.36,0.40 2014-03-28 15:08:09,78.253064537,-128.213238549,0.19,0.45,0.11,0.14,0.22,0.30,0.36 2014-03-28 15:09:27,78.211952593,-127.821595491,0.19,0.48,0.09,0.15,0.23,0.31,0.38 2014-03-28 15:10:45,78.170332085,-127.432595392,0.19,0.41,0.10,0.14,0.24,0.30,0.36 2014-03-28 15:12:03,78.128218674,-127.04621609,0.18,0.52,0.08,0.13,0.22,0.36,0.46 2014-03-28 15:13:21,78.085586064,-126.662547605,0.24,0.81,0.10,0.17,0.28,0.42,0.67 2014-03-28 15:14:39,78.042412315,-126.281653945,0.20,0.89,0.08,0.13,0.24,0.41,0.61 2014-03-28 15:15:58,77.998738572,-125.903448827,0.25,0.65,0.13,0.18,0.30,0.39,0.50 2014-03-28 15:17:16,77.954542675,-125.528011864,0.23,0.59,0.04,0.16,0.30,0.42,0.48 2014-03-28 15:18:33,77.909720973,-125.155647804,0.17,0.93,0.04,0.08,0.20,0.51,0.67 2014-03-28 15:19:51,77.864573984,-124.785545502,0.21,0.78,0.08,0.14,0.26,0.45,0.58 2014-03-28 15:21:08,77.818863244,-124.418368246,0.24,0.67,0.11,0.17,0.29,0.41,0.55 2014-03-28 15:22:25,77.772738924,-124.053716291,0.30,0.68,0.15,0.21,0.37,0.51,0.58 2014-03-28 15:23:41,77.726100862,-123.691885042,0.22,1.01,0.08,0.12,0.27,0.51,0.65 2014-03-28 15:24:56,77.678983114,-123.332791372,0.18,0.54,0.08,0.12,0.23,0.31,0.46 2014-03-28 15:26:10,77.631384426,-122.976453387,0.18,0.64,0.08,0.12,0.23,0.34,0.44 2014-03-28 15:27:24,77.58336335,-122.622702255,0.24,0.76,0.09,0.14,0.31,0.46,0.56 2014-03-28 15:28:38,77.534878822,-122.271668617,0.29,0.99,0.10,0.19,0.35,0.57,0.75 2014-03-28 15:29:51,77.485931132,-121.923366237,0.23,0.78,0.08,0.14,0.29,0.45,0.63 2014-03-28 15:31:05,77.4365260942,-121.577787032,0.23,0.58,0.04,0.15,0.31,0.44,0.51 2014-03-28 15:32:18,77.3866947,-121.234848032,0.29,0.73,0.13,0.20,0.35,0.49,0.64 2014-03-28 15:33:32,77.335895226,-120.890758854,0.27,0.94,0.10,0.18,0.35,0.49,0.59 2014-03-28 15:34:47,77.283620964,-120.542749974,0.16,0.76,0.04,0.04,0.26,0.45,0.61 2014-03-28 15:36:03,77.230856036,-120.197545624,0.30,0.80,0.13,0.22,0.37,0.57,0.72 2014-03-28 15:36:58,77.1920223834,-119.947531316,0.42,1.03,0.20,0.29,0.50,0.80,0.95