# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20110322.10km.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 2011-03-22 15:13:11,84.7611838826,-71.1838466991,0.20,1.67,0.05,0.12,0.25,0.44,0.66 2011-03-22 15:18:06,84.9370250023,-73.5806348967,0.20,1.36,0.07,0.13,0.25,0.40,0.55 2011-03-22 15:20:30,85.0201408069,-74.8301968226,0.21,0.93,0.05,0.12,0.28,0.48,0.71 2011-03-22 15:23:16,85.1127680523,-76.3128382386,0.23,0.72,0.09,0.15,0.29,0.42,0.51 2011-03-22 15:25:04,85.171477352,-77.3112717384,0.25,1.13,0.07,0.13,0.32,0.60,0.86 2011-03-22 15:26:53,85.2296943442,-78.3510128071,0.21,0.65,0.10,0.14,0.26,0.39,0.51 2011-03-22 15:28:27,85.2784079441,-79.2634999353,0.22,0.92,0.09,0.14,0.27,0.43,0.62 2011-03-22 15:30:02,85.3261187536,-80.2000543005,0.22,1.50,0.09,0.15,0.26,0.42,0.64 2011-03-22 15:31:37,85.372700308,-81.1609533461,0.25,1.42,0.10,0.17,0.30,0.45,0.60 2011-03-22 15:33:13,85.4184782914,-82.143724318,0.19,0.82,0.09,0.13,0.23,0.38,0.53 2011-03-22 15:34:50,85.4623588022,-83.1422437187,0.18,0.54,0.09,0.13,0.22,0.31,0.42 2011-03-22 15:36:27,85.5050462992,-84.1556623976,0.18,0.50,0.07,0.12,0.22,0.33,0.39 2011-03-22 15:38:04,85.546132643,-85.187697186,0.18,0.57,0.09,0.12,0.21,0.35,0.51 2011-03-22 15:39:41,85.585286378,-86.233377504,0.18,0.44,0.09,0.13,0.21,0.32,0.38 2011-03-22 15:41:19,85.62327399,-87.295474354,0.18,0.97,0.09,0.12,0.21,0.31,0.42 2011-03-22 15:42:56,85.6597881722,-88.3754853695,0.14,0.49,0.05,0.07,0.18,0.26,0.33 2011-03-22 15:44:35,85.694543213,-89.474468941,0.19,0.51,0.10,0.14,0.23,0.34,0.42 2011-03-22 15:46:13,85.727807604,-90.590304876,0.19,0.65,0.08,0.12,0.22,0.37,0.52 2011-03-22 15:47:52,85.759435444,-91.723181319,0.17,0.87,0.08,0.11,0.20,0.33,0.53 2011-03-22 15:49:30,85.789420082,-92.872431593,0.21,1.05,0.10,0.15,0.25,0.39,0.56 2011-03-22 15:51:07,85.817752744,-94.037396937,0.19,0.53,0.10,0.14,0.23,0.33,0.39 2011-03-22 15:52:44,85.844482462,-95.217071624,0.20,0.65,0.12,0.15,0.24,0.32,0.44 2011-03-22 15:54:20,85.869415777,-96.411703244,0.19,0.90,0.09,0.14,0.23,0.33,0.45 2011-03-22 15:55:57,85.8924783999,-97.6205807223,0.20,0.56,0.10,0.15,0.24,0.36,0.47 2011-03-22 15:57:08,85.9080717081,-98.5107507647,0.18,0.46,0.06,0.13,0.21,0.29,0.39 2011-03-22 16:00:18,85.915278086,-100.918803426,0.18,0.55,0.09,0.13,0.22,0.30,0.36 2011-03-22 16:01:55,85.894596379,-102.142979789,0.18,0.47,0.07,0.13,0.23,0.31,0.38 2011-03-22 16:03:32,85.871755311,-103.353258946,0.15,0.84,0.08,0.11,0.18,0.26,0.37 2011-03-22 16:05:08,85.847126483,-104.549804371,0.18,0.53,0.04,0.11,0.25,0.35,0.47 2011-03-22 16:06:46,85.820794729,-105.732031742,0.17,0.44,0.07,0.12,0.21,0.30,0.38 2011-03-22 16:08:23,85.792863458,-106.899706887,0.20,0.69,0.08,0.14,0.23,0.40,0.59 2011-03-22 16:10:01,85.763069387,-108.05082416,0.19,0.73,0.08,0.14,0.23,0.36,0.44 2011-03-22 16:11:35,85.731480981,-109.184855975,0.20,0.58,0.11,0.14,0.23,0.32,0.39 2011-03-22 16:13:05,85.698209526,-110.301618291,0.21,0.63,0.10,0.14,0.25,0.37,0.48 2011-03-22 16:14:33,85.663732199,-111.403115175,0.18,0.41,0.09,0.14,0.23,0.29,0.33 2011-03-22 16:15:58,85.627236702,-112.484226039,0.17,0.47,0.09,0.11,0.20,0.31,0.38 2011-03-22 16:17:22,85.589909586,-113.551367997,0.17,0.48,0.04,0.12,0.20,0.30,0.38 2011-03-22 16:18:47,85.550628493,-114.597366471,0.15,0.40,0.04,0.10,0.19,0.28,0.33 2011-03-22 16:20:13,85.509879556,-115.624660663,0.14,0.46,0.09,0.11,0.17,0.24,0.30 2011-03-22 16:21:38,85.467725545,-116.633237818,0.16,0.36,0.09,0.11,0.19,0.27,0.33 2011-03-22 16:23:04,85.424441825,-117.62468259,0.19,0.50,0.08,0.12,0.24,0.33,0.40 2011-03-22 16:24:30,85.379598212,-118.595681373,0.18,0.51,0.10,0.13,0.22,0.33,0.41 2011-03-22 16:25:55,85.333629236,-119.549083451,0.17,0.43,0.10,0.13,0.20,0.26,0.31 2011-03-22 16:27:21,85.286397587,-120.48365713,0.16,0.35,0.09,0.13,0.19,0.25,0.28 2011-03-22 16:28:45,85.2379412734,-121.399469681,0.16,0.62,0.09,0.12,0.19,0.26,0.36 2011-03-22 16:30:09,85.188288803,-122.296582313,0.18,0.39,0.10,0.14,0.21,0.29,0.36 2011-03-22 16:31:36,85.1360874432,-123.202242456,0.17,0.72,0.08,0.12,0.20,0.31,0.43 2011-03-22 16:33:05,85.0800989951,-124.125241371,0.15,0.46,0.07,0.10,0.19,0.30,0.38 2011-03-22 16:34:30,85.0269975169,-124.968089676,0.17,0.39,0.07,0.12,0.21,0.29,0.35 2011-03-22 16:36:01,84.9729192507,-125.791126742,0.17,1.23,0.07,0.11,0.20,0.31,0.40 2011-03-22 16:37:43,84.9146310824,-126.642137671,0.17,0.83,0.08,0.12,0.20,0.30,0.39 2011-03-22 16:39:31,84.8505976664,-127.536205316,0.15,0.90,0.05,0.08,0.19,0.35,0.58 2011-03-22 16:41:25,84.7771712746,-128.518601275,0.17,2.64,0.07,0.11,0.20,0.30,0.51 2011-03-22 16:42:55,84.7162020067,-129.30397936,0.20,0.57,0.09,0.13,0.24,0.37,0.46 2011-03-22 16:44:24,84.65683732,-130.032037763,0.19,0.58,0.09,0.13,0.23,0.33,0.39 2011-03-22 16:45:56,84.5968816,-130.746439002,0.20,0.57,0.07,0.14,0.25,0.35,0.47 2011-03-22 16:47:32,84.5354780871,-131.450319456,0.19,0.50,0.08,0.13,0.24,0.36,0.43 2011-03-22 16:49:10,84.4731154089,-132.14046077,0.15,0.50,0.06,0.11,0.18,0.26,0.35 2011-03-22 17:00:37,83.9850761327,-136.483039251,0.16,0.62,0.07,0.11,0.19,0.29,0.38 2011-03-22 17:11:17,83.5164615739,-140.45435359,0.21,0.87,0.07,0.12,0.27,0.40,0.63 2011-03-22 17:12:42,83.4452814762,-140.944172139,0.16,0.62,0.07,0.11,0.20,0.29,0.35 2011-03-22 17:14:07,83.3739299427,-141.421612797,0.26,0.63,0.14,0.20,0.31,0.40,0.51 2011-03-22 17:15:44,83.2925433136,-141.950681517,0.16,0.55,0.08,0.11,0.20,0.29,0.40 2011-03-22 17:17:14,83.215185237,-142.438879513,0.16,0.86,0.09,0.12,0.19,0.25,0.31 2011-03-22 17:18:36,83.142828217,-142.88714001,0.14,0.51,0.08,0.10,0.17,0.24,0.29 2011-03-22 17:19:56,83.069654777,-143.321297735,0.14,0.30,0.08,0.10,0.17,0.24,0.27 2011-03-22 17:21:13,82.996002344,-143.745314976,0.17,0.51,0.08,0.12,0.21,0.33,0.43 2011-03-22 17:22:29,82.9227501476,-144.169587783,0.14,0.36,0.08,0.10,0.16,0.22,0.28 2011-03-22 17:23:47,82.848512246,-144.578011199,0.19,0.56,0.10,0.14,0.23,0.32,0.39 2011-03-22 17:25:06,82.774237541,-144.981798211,0.16,0.49,0.09,0.12,0.20,0.26,0.33 2011-03-22 17:26:24,82.699440403,-145.375314957,0.15,0.47,0.09,0.12,0.18,0.24,0.36 2011-03-22 17:27:42,82.62450617,-145.763221389,0.17,0.40,0.08,0.11,0.22,0.31,0.36 2011-03-22 17:28:59,82.549119896,-146.141867323,0.17,0.44,0.09,0.13,0.21,0.29,0.39 2011-03-22 17:30:17,82.473441025,-146.513232947,0.16,0.42,0.07,0.11,0.20,0.28,0.35 2011-03-22 17:31:34,82.397492779,-146.877667848,0.14,0.50,0.07,0.10,0.17,0.27,0.37 2011-03-22 17:32:50,82.321155843,-147.233825608,0.15,0.40,0.09,0.12,0.18,0.25,0.32 2011-03-22 17:34:06,82.244637115,-147.584274037,0.16,0.47,0.08,0.11,0.19,0.26,0.31 2011-03-22 17:34:50,82.2003871688,-147.783824422,0.16,0.31,0.10,0.12,0.18,0.25,0.30