# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20100421.10km.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 2010-04-21 12:43:24,84.47501186,-99.173417384,0.17,0.52,0.09,0.13,0.20,0.28,0.38 2010-04-21 12:44:28,84.4126173219,-99.8491600737,0.18,0.46,0.11,0.13,0.21,0.28,0.35 2010-04-21 12:45:34,84.348959308,-100.506502408,0.24,0.52,0.12,0.20,0.29,0.37,0.42 2010-04-21 12:46:40,84.284957466,-101.147386638,0.25,1.09,0.13,0.19,0.29,0.39,0.51 2010-04-21 12:47:48,84.2205297128,-101.772528317,0.24,0.58,0.13,0.17,0.29,0.38,0.47 2010-04-21 12:48:56,84.1549057807,-102.387523792,0.21,0.59,0.05,0.15,0.27,0.37,0.46 2010-04-21 12:50:04,84.0884052778,-102.991237367,0.21,0.61,0.09,0.14,0.26,0.36,0.49 2010-04-21 12:51:11,84.021453265,-103.581212598,0.16,0.49,0.09,0.11,0.20,0.28,0.36 2010-04-21 12:52:17,83.954499785,-104.153050607,0.20,0.48,0.09,0.13,0.25,0.35,0.41 2010-04-21 12:53:24,83.8866206192,-104.714993833,0.20,0.52,0.08,0.16,0.25,0.31,0.35 2010-04-21 12:54:31,83.81762148,-105.267821094,0.22,0.57,0.12,0.16,0.27,0.38,0.49 2010-04-21 12:55:37,83.748983819,-105.803007877,0.19,0.56,0.06,0.08,0.27,0.41,0.53 2010-04-21 12:56:43,83.679798787,-106.326368529,0.23,0.65,0.12,0.17,0.28,0.38,0.44 2010-04-21 12:57:49,83.6100345807,-106.839485997,0.20,0.56,0.10,0.14,0.25,0.33,0.40 2010-04-21 12:58:55,83.539868874,-107.341497779,0.20,0.50,0.10,0.14,0.24,0.34,0.41 2010-04-21 13:00:01,83.4692289959,-107.832077811,0.21,0.63,0.05,0.14,0.27,0.37,0.52 2010-04-21 13:01:07,83.398127356,-108.312530323,0.20,0.48,0.11,0.15,0.24,0.32,0.42 2010-04-21 13:02:13,83.326464126,-108.783369793,0.20,0.48,0.10,0.14,0.23,0.37,0.42 2010-04-21 13:03:19,83.2544313772,-109.244881327,0.15,0.52,0.04,0.06,0.21,0.32,0.39 2010-04-21 13:04:25,83.181968822,-109.697536921,0.23,0.59,0.15,0.18,0.26,0.36,0.45 2010-04-21 13:05:31,83.109103893,-110.139834879,0.19,0.53,0.10,0.13,0.23,0.33,0.38 2010-04-21 13:06:37,83.035848481,-110.572699716,0.20,0.47,0.12,0.15,0.25,0.32,0.41 2010-04-21 13:07:43,82.962321392,-110.996131097,0.21,0.62,0.09,0.15,0.26,0.38,0.49 2010-04-21 13:08:48,82.888434458,-111.410976969,0.23,0.66,0.10,0.15,0.29,0.50,0.59 2010-04-21 13:09:54,82.8139055163,-111.818742683,0.18,0.64,0.06,0.10,0.23,0.34,0.46 2010-04-21 13:11:00,82.739337746,-112.217497436,0.22,0.50,0.08,0.14,0.29,0.39,0.46 2010-04-21 13:12:05,82.6644607361,-112.608237259,0.22,0.61,0.12,0.16,0.27,0.37,0.49 2010-04-21 13:13:12,82.5877185795,-112.998317726,0.23,0.57,0.10,0.17,0.29,0.39,0.48 2010-04-21 13:14:18,82.512038277,-113.374111195,0.25,0.58,0.13,0.18,0.31,0.41,0.48 2010-04-21 13:15:23,82.4362293616,-113.742089695,0.15,0.51,0.06,0.10,0.19,0.29,0.35 2010-04-21 13:16:28,82.3600980244,-114.102546329,0.19,0.44,0.10,0.14,0.24,0.31,0.36 2010-04-21 13:17:34,82.2834725897,-114.457137049,0.24,0.69,0.12,0.17,0.29,0.40,0.54 2010-04-21 13:18:39,82.206637761,-114.80349739,0.27,0.63,0.14,0.21,0.32,0.42,0.56 2010-04-21 13:19:45,82.128791334,-115.147936992,0.23,0.48,0.11,0.17,0.28,0.39,0.44 2010-04-21 13:20:51,82.0507946721,-115.485247395,0.17,0.44,0.09,0.12,0.21,0.30,0.35 2010-04-21 13:21:56,81.973137611,-115.813646765,0.23,0.59,0.08,0.14,0.30,0.41,0.50 2010-04-21 13:23:01,81.895380254,-116.134255548,0.14,0.41,0.07,0.10,0.16,0.27,0.33 2010-04-21 13:24:06,81.817418218,-116.449303285,0.23,0.48,0.11,0.17,0.28,0.37,0.40 2010-04-21 13:25:11,81.739115586,-116.759022529,0.24,0.54,0.12,0.18,0.30,0.39,0.48 2010-04-21 13:26:16,81.6605978043,-117.063348296,0.22,0.47,0.10,0.16,0.27,0.35,0.40 2010-04-21 13:27:21,81.5820148856,-117.362052843,0.16,0.40,0.06,0.11,0.20,0.27,0.34 2010-04-21 13:28:26,81.503145824,-117.654453909,0.18,0.44,0.10,0.14,0.21,0.31,0.36 2010-04-21 13:29:31,81.4239251104,-117.942958122,0.20,0.48,0.08,0.14,0.25,0.34,0.40 2010-04-21 13:30:36,81.344611997,-118.225171486,0.16,0.41,0.06,0.12,0.20,0.28,0.33 2010-04-21 13:31:41,81.265166264,-118.502528601,0.20,0.76,0.09,0.13,0.24,0.37,0.53 2010-04-21 13:32:47,81.185448826,-118.774742746,0.18,0.41,0.05,0.13,0.24,0.32,0.37 2010-04-21 13:33:52,81.105492371,-119.043830207,0.21,0.53,0.10,0.16,0.26,0.34,0.42 2010-04-21 13:34:57,81.025517113,-119.307253362,0.23,0.54,0.11,0.17,0.28,0.37,0.42 2010-04-21 13:36:02,80.9452438972,-119.566434998,0.21,0.59,0.05,0.15,0.26,0.37,0.45 2010-04-21 13:37:07,80.864718879,-119.821171777,0.19,0.51,0.07,0.14,0.23,0.33,0.41 2010-04-21 13:38:12,80.7840780604,-120.071083637,0.14,0.44,0.05,0.06,0.20,0.32,0.38 2010-04-21 13:39:17,80.703446883,-120.31729395,0.23,0.70,0.12,0.17,0.27,0.39,0.46 2010-04-21 13:40:23,80.622621938,-120.558938606,0.19,0.48,0.06,0.15,0.24,0.31,0.36 2010-04-21 13:41:28,80.5414375912,-120.79747561,0.25,0.53,0.12,0.20,0.30,0.39,0.44 2010-04-21 13:42:34,80.460278853,-121.03112737,0.24,0.64,0.05,0.18,0.31,0.41,0.56 2010-04-21 13:43:39,80.3789969842,-121.260945118,0.22,0.59,0.07,0.17,0.28,0.37,0.48 2010-04-21 13:44:44,80.2975094474,-121.487359697,0.26,0.57,0.12,0.21,0.32,0.42,0.50 2010-04-21 13:45:50,80.2155356168,-121.711054566,0.22,0.55,0.11,0.17,0.26,0.34,0.44 2010-04-21 13:46:56,80.1333571138,-121.931724467,0.21,0.48,0.11,0.15,0.25,0.34,0.42 2010-04-21 13:48:02,80.0508129681,-122.149609428,0.21,0.45,0.12,0.17,0.25,0.33,0.42 2010-04-21 13:49:08,79.967739756,-122.364466158,0.24,0.53,0.12,0.18,0.29,0.39,0.46 2010-04-21 13:50:14,79.88558888,-122.573372518,0.19,0.37,0.11,0.15,0.22,0.29,0.32 2010-04-21 13:51:19,79.803409046,-122.779129998,0.15,0.53,0.04,0.05,0.24,0.36,0.45 2010-04-21 13:52:24,79.7210885231,-122.981741671,0.28,0.74,0.15,0.21,0.34,0.46,0.61 2010-04-21 13:53:29,79.638380787,-123.180971092,0.25,0.62,0.13,0.20,0.29,0.39,0.49 2010-04-21 13:54:34,79.5558351615,-123.377236053,0.18,0.58,0.09,0.13,0.22,0.33,0.42 2010-04-21 13:55:46,79.4638930086,-123.591579944,0.20,0.54,0.08,0.14,0.24,0.36,0.47 2010-04-21 13:56:56,79.3741864835,-123.798043912,0.19,0.98,0.04,0.11,0.25,0.36,0.52 2010-04-21 13:58:10,79.2791714867,-124.012933523,0.18,1.33,0.05,0.09,0.24,0.38,0.50 2010-04-21 14:24:42,77.2751733282,-127.625784068,0.22,1.01,0.08,0.16,0.28,0.40,0.52 2010-04-21 14:32:34,76.6786599282,-128.668194279,0.19,0.73,0.07,0.09,0.25,0.35,0.49 2010-04-21 14:36:21,76.3776438194,-129.092686477,0.21,0.78,0.07,0.13,0.27,0.40,0.55 2010-04-21 14:38:02,76.2475495837,-129.271351403,0.20,0.63,0.11,0.14,0.25,0.37,0.47 2010-04-21 14:39:32,76.1354239891,-129.421355046,0.25,0.68,0.10,0.17,0.31,0.49,0.62 2010-04-21 14:40:48,76.038452416,-129.550271566,0.22,0.60,0.10,0.16,0.27,0.34,0.39 2010-04-21 14:42:04,75.9441033059,-129.673253776,0.18,0.62,0.07,0.11,0.23,0.39,0.53 2010-04-21 14:43:58,75.8009269949,-129.857302418,0.25,0.86,0.08,0.17,0.31,0.46,0.62 2010-04-21 14:45:13,75.7065295956,-129.976285412,0.26,1.09,0.08,0.16,0.34,0.51,0.74 2010-04-21 14:51:36,75.2133290512,-130.569513275,0.14,0.61,0.06,0.07,0.14,0.42,0.55 2010-04-21 14:55:16,74.929678944,-130.904463816,0.08,0.20,0.06,0.07,0.09,0.13,0.18 2010-04-21 14:56:23,74.8431064166,-131.002043051,0.07,0.31,0.05,0.05,0.08,0.14,0.20 2010-04-21 14:57:30,74.756749154,-131.098179879,0.14,0.49,0.05,0.08,0.18,0.29,0.39 2010-04-21 14:58:37,74.67049855,-131.193421792,0.12,0.28,0.05,0.07,0.15,0.22,0.26 2010-04-21 14:59:44,74.5841665579,-131.287906502,0.13,0.31,0.06,0.10,0.16,0.24,0.28 2010-04-21 15:00:51,74.497663012,-131.381654933,0.19,0.56,0.07,0.13,0.24,0.33,0.43 2010-04-21 15:01:59,74.411310897,-131.474037093,0.14,0.62,0.06,0.08,0.16,0.30,0.45 2010-04-21 15:03:08,74.324916292,-131.565368327,0.12,0.27,0.07,0.08,0.15,0.20,0.24 2010-04-21 15:04:17,74.238424444,-131.655877941,0.11,0.30,0.07,0.09,0.13,0.19,0.25 2010-04-21 15:05:26,74.151967267,-131.745734506,0.14,0.41,0.08,0.11,0.16,0.23,0.30 2010-04-21 15:06:35,74.065494487,-131.834605106,0.23,0.74,0.07,0.14,0.28,0.53,0.68 2010-04-21 15:07:43,73.9789363657,-131.922608023,0.17,0.38,0.09,0.13,0.21,0.25,0.31 2010-04-21 15:08:50,73.892273667,-132.009794444,0.14,0.41,0.07,0.10,0.16,0.25,0.31 2010-04-21 15:09:57,73.80569105,-132.095858952,0.13,0.41,0.07,0.09,0.15,0.23,0.34 2010-04-21 15:11:03,73.719093357,-132.181278508,0.13,0.44,0.06,0.08,0.16,0.24,0.37 2010-04-21 15:12:09,73.6322024695,-132.266022232,0.17,0.53,0.05,0.10,0.23,0.37,0.46 2010-04-21 15:13:15,73.545451824,-132.349861752,0.23,0.70,0.09,0.15,0.29,0.43,0.57 2010-04-21 15:14:21,73.4587565759,-132.432716323,0.17,0.64,0.09,0.13,0.20,0.26,0.36 2010-04-21 15:15:27,73.37202168,-132.514998782,0.20,0.42,0.12,0.15,0.24,0.33,0.37 2010-04-21 15:16:34,73.2851298163,-132.596478462,0.17,0.55,0.06,0.10,0.21,0.34,0.41 2010-04-21 15:17:41,73.1983212783,-132.677029314,0.15,0.41,0.06,0.07,0.21,0.29,0.35 2010-04-21 15:18:49,73.109756249,-132.758892401,0.15,0.43,0.05,0.09,0.19,0.29,0.37 2010-04-21 15:19:56,73.022387044,-132.8376878,0.13,0.40,0.06,0.09,0.15,0.27,0.35 2010-04-21 15:21:03,72.935349798,-132.916578348,0.11,0.26,0.07,0.09,0.12,0.16,0.19 2010-04-21 15:22:10,72.8484769234,-132.994302354,0.17,0.46,0.06,0.09,0.22,0.34,0.41 2010-04-21 15:23:17,72.7615541862,-133.071309336,0.14,0.46,0.06,0.09,0.17,0.29,0.36 2010-04-21 15:24:24,72.6743995587,-133.147922258,0.14,0.48,0.07,0.10,0.16,0.24,0.39 2010-04-21 15:25:30,72.587454145,-133.223584412,0.13,0.45,0.07,0.09,0.15,0.22,0.30 2010-04-21 15:26:36,72.500477487,-133.298479294,0.13,0.37,0.07,0.09,0.15,0.25,0.34 2010-04-21 15:27:42,72.413370864,-133.372575794,0.14,0.31,0.07,0.09,0.17,0.23,0.27 2010-04-21 15:28:48,72.3262651903,-133.446281235,0.14,0.29,0.08,0.11,0.16,0.21,0.25 2010-04-21 15:29:54,72.239231304,-133.519373713,0.14,0.31,0.09,0.11,0.16,0.23,0.28 2010-04-21 15:31:00,72.152173365,-133.591810359,0.13,0.36,0.07,0.10,0.15,0.22,0.30 2010-04-21 15:32:06,72.064931406,-133.663716409,0.12,0.24,0.07,0.09,0.15,0.20,0.22 2010-04-21 15:33:11,71.977802785,-133.734782673,0.12,0.33,0.07,0.08,0.14,0.21,0.26 2010-04-21 15:34:17,71.8906646104,-133.805181688,0.14,0.41,0.08,0.10,0.17,0.26,0.33 2010-04-21 15:35:22,71.8034410022,-133.875230299,0.12,0.37,0.08,0.09,0.14,0.21,0.26 2010-04-21 15:36:28,71.716100528,-133.944874842,0.13,0.46,0.07,0.10,0.16,0.24,0.32 2010-04-21 15:37:34,71.6289151332,-134.01370098,0.15,0.37,0.09,0.11,0.18,0.23,0.27 2010-04-21 15:38:41,71.541695715,-134.081775559,0.16,0.32,0.10,0.12,0.18,0.24,0.27 2010-04-21 15:39:47,71.4542745978,-134.149501438,0.15,0.38,0.08,0.12,0.18,0.25,0.29 2010-04-21 15:40:53,71.3669398322,-134.216494004,0.15,0.34,0.08,0.11,0.17,0.26,0.31 2010-04-21 15:42:00,71.2796779973,-134.283112058,0.15,0.37,0.09,0.12,0.18,0.24,0.29 2010-04-21 15:43:06,71.192372311,-134.349213853,0.18,0.41,0.09,0.13,0.22,0.29,0.36 2010-04-21 15:44:13,71.1049148886,-134.414719876,0.18,0.43,0.08,0.14,0.21,0.29,0.36 2010-04-21 15:45:19,71.0175819047,-134.479544705,0.15,0.42,0.07,0.10,0.19,0.28,0.34 2010-04-21 15:46:26,70.930225619,-134.543782154,0.19,0.40,0.11,0.15,0.22,0.31,0.36 2010-04-21 15:47:32,70.8428191686,-134.607790381,0.19,0.41,0.10,0.14,0.22,0.30,0.35 2010-04-21 15:48:39,70.7552834057,-134.671404601,0.23,0.62,0.12,0.17,0.27,0.39,0.45 2010-04-21 15:49:45,70.6678376325,-134.734296258,0.17,0.39,0.09,0.13,0.21,0.28,0.35 2010-04-21 15:50:51,70.580419189,-134.796661482,0.19,0.40,0.11,0.14,0.22,0.29,0.34 2010-04-21 15:51:58,70.492800501,-134.858486047,0.16,0.32,0.09,0.13,0.19,0.24,0.28 2010-04-21 15:53:04,70.405351402,-134.919897125,0.18,0.45,0.09,0.12,0.22,0.33,0.39 2010-04-21 15:54:10,70.317889097,-134.980876445,0.20,0.51,0.11,0.15,0.25,0.32,0.39 2010-04-21 15:55:16,70.230332756,-135.041404659,0.22,0.51,0.11,0.17,0.26,0.40,0.46 2010-04-21 15:56:22,70.1427360169,-135.101506047,0.28,0.65,0.12,0.18,0.37,0.53,0.59 2010-04-21 15:57:36,70.0447978266,-135.168291556,0.23,0.62,0.08,0.18,0.27,0.38,0.49 2010-04-21 15:58:52,69.9450873613,-135.235365409,0.23,0.53,0.11,0.17,0.29,0.38,0.45 2010-04-21 15:59:59,69.857372605,-135.293909234,0.23,0.52,0.06,0.09,0.37,0.45,0.49 2010-04-21 16:01:06,69.769821737,-135.352195985,0.21,0.58,0.07,0.15,0.26,0.36,0.44 2010-04-21 16:02:12,69.682245748,-135.409922139,0.12,0.34,0.08,0.09,0.14,0.21,0.24 2010-04-21 16:03:20,69.594534809,-135.467043734,0.29,2.17,0.08,0.09,0.45,0.73,1.21 2010-04-21 16:04:27,69.506857261,-135.52400527,0.09,0.18,0.08,0.08,0.09,0.09,0.14 2010-04-21 16:05:11,69.4495907362,-135.560849085,0.08,0.10,0.08,0.08,0.09,0.09,0.10