# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20110325.10km.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 2011-03-25 10:27:59,70.2459635626,-135.043538022,0.20,0.58,0.11,0.15,0.22,0.32,0.44 2011-03-25 10:29:22,70.3367556982,-134.971020462,0.12,0.30,0.06,0.08,0.15,0.22,0.26 2011-03-25 10:30:44,70.430748246,-134.903945874,0.16,0.45,0.09,0.12,0.18,0.29,0.36 2011-03-25 10:31:59,70.518122153,-134.841506659,0.21,0.55,0.13,0.17,0.24,0.32,0.40 2011-03-25 10:33:12,70.605559614,-134.77960613,0.19,0.39,0.13,0.16,0.22,0.29,0.35 2011-03-25 10:34:25,70.693002719,-134.717508282,0.17,0.37,0.12,0.13,0.20,0.28,0.34 2011-03-25 10:35:39,70.780381848,-134.654329389,0.16,0.43,0.11,0.14,0.17,0.24,0.35 2011-03-25 10:36:52,70.8683698011,-134.59044603,0.13,0.36,0.06,0.08,0.16,0.21,0.27 2011-03-25 10:38:05,70.9558212568,-134.526607433,0.12,0.48,0.06,0.08,0.15,0.25,0.37 2011-03-25 10:39:17,71.043238343,-134.461648986,0.12,0.40,0.07,0.09,0.14,0.23,0.31 2011-03-25 10:40:29,71.130554974,-134.396532661,0.10,0.33,0.07,0.08,0.12,0.19,0.23 2011-03-25 10:41:41,71.2178663292,-134.331060078,0.21,0.94,0.07,0.15,0.27,0.36,0.45 2011-03-25 10:42:52,71.305113498,-134.264465978,0.16,0.53,0.07,0.09,0.20,0.35,0.44 2011-03-25 10:44:05,71.39239688,-134.19799204,0.13,0.31,0.08,0.10,0.14,0.21,0.26 2011-03-25 10:45:18,71.479665349,-134.13107021,0.19,0.49,0.07,0.13,0.24,0.34,0.43 2011-03-25 10:46:31,71.5669351,-134.063863411,0.16,0.44,0.08,0.12,0.20,0.27,0.36 2011-03-25 10:47:44,71.654107622,-133.995098595,0.12,0.36,0.07,0.09,0.14,0.23,0.28 2011-03-25 10:48:56,71.741292974,-133.926189487,0.15,0.33,0.06,0.10,0.19,0.26,0.30 2011-03-25 10:50:08,71.828463548,-133.856741403,0.17,0.44,0.09,0.13,0.20,0.27,0.31 2011-03-25 10:51:20,71.915584559,-133.786350196,0.14,0.47,0.07,0.09,0.18,0.26,0.40 2011-03-25 10:52:31,72.002692746,-133.715471856,0.11,0.30,0.06,0.08,0.14,0.21,0.26 2011-03-25 10:53:43,72.089828526,-133.644616013,0.13,0.28,0.06,0.09,0.16,0.22,0.26 2011-03-25 10:54:54,72.176923753,-133.572907424,0.15,0.57,0.07,0.10,0.18,0.25,0.31 2011-03-25 10:56:05,72.263961474,-133.500118824,0.12,0.33,0.07,0.08,0.15,0.22,0.27 2011-03-25 10:57:16,72.3509900256,-133.426850448,0.11,0.23,0.06,0.08,0.13,0.18,0.20 2011-03-25 10:58:28,72.4380243667,-133.353313045,0.12,0.39,0.06,0.08,0.14,0.21,0.26 2011-03-25 10:59:39,72.525017391,-133.278891458,0.13,0.34,0.08,0.11,0.16,0.20,0.23 2011-03-25 11:00:51,72.611974872,-133.203653627,0.13,0.31,0.08,0.10,0.16,0.22,0.26 2011-03-25 11:02:03,72.698907685,-133.127744156,0.11,0.28,0.07,0.08,0.13,0.19,0.22 2011-03-25 11:03:15,72.7858007535,-133.051019979,0.12,0.28,0.07,0.09,0.15,0.20,0.24 2011-03-25 11:04:27,72.8727051652,-132.973972048,0.10,0.29,0.06,0.07,0.11,0.17,0.22 2011-03-25 11:05:39,72.9595930849,-132.896334277,0.12,0.32,0.08,0.09,0.14,0.20,0.23 2011-03-25 11:06:51,73.0464163049,-132.817471434,0.14,0.46,0.08,0.11,0.17,0.23,0.29 2011-03-25 11:08:03,73.133246586,-132.738316682,0.13,0.34,0.08,0.10,0.16,0.23,0.29 2011-03-25 11:09:15,73.219994479,-132.65775898,0.15,0.43,0.09,0.12,0.17,0.25,0.32 2011-03-25 11:10:27,73.30675726,-132.57694179,0.16,0.58,0.09,0.12,0.18,0.29,0.40 2011-03-25 11:11:40,73.393535363,-132.495888811,0.18,0.43,0.08,0.12,0.22,0.32,0.40 2011-03-25 11:12:53,73.480233203,-132.413388894,0.15,0.66,0.07,0.10,0.19,0.27,0.38 2011-03-25 11:14:06,73.566952977,-132.330748834,0.15,0.35,0.09,0.12,0.17,0.23,0.31 2011-03-25 11:15:19,73.653593619,-132.24666172,0.14,0.44,0.08,0.10,0.16,0.24,0.30 2011-03-25 11:16:32,73.740167725,-132.161258972,0.13,0.39,0.08,0.10,0.15,0.21,0.29 2011-03-25 11:17:45,73.826763634,-132.075705117,0.12,0.33,0.06,0.08,0.14,0.20,0.30 2011-03-25 11:18:58,73.913363525,-131.989758059,0.11,0.31,0.06,0.08,0.13,0.19,0.23 2011-03-25 11:20:10,73.999900234,-131.902540366,0.16,0.40,0.07,0.11,0.20,0.28,0.35 2011-03-25 11:21:22,74.086394914,-131.814323503,0.19,0.69,0.11,0.13,0.21,0.37,0.47 2011-03-25 11:22:34,74.172879316,-131.725525644,0.16,0.40,0.09,0.12,0.19,0.27,0.34 2011-03-25 11:23:46,74.259287782,-131.635228803,0.15,0.36,0.09,0.11,0.18,0.27,0.34 2011-03-25 11:24:58,74.345731066,-131.544900088,0.18,0.36,0.10,0.14,0.21,0.26,0.32 2011-03-25 11:26:10,74.432130499,-131.453512981,0.17,0.40,0.10,0.14,0.20,0.26,0.33 2011-03-25 11:27:22,74.518438861,-131.360451432,0.14,0.38,0.09,0.11,0.16,0.24,0.31 2011-03-25 11:28:33,74.604736224,-131.266671423,0.20,0.40,0.12,0.17,0.24,0.29,0.35 2011-03-25 11:29:45,74.691030161,-131.172344083,0.16,0.40,0.10,0.12,0.19,0.25,0.32 2011-03-25 11:30:56,74.777305261,-131.077297033,0.18,0.47,0.10,0.14,0.21,0.28,0.36 2011-03-25 11:32:08,74.863501673,-130.980691946,0.17,0.48,0.10,0.13,0.20,0.30,0.40 2011-03-25 11:33:19,74.949660477,-130.883065818,0.20,0.46,0.13,0.16,0.24,0.31,0.37 2011-03-25 11:34:30,75.035830401,-130.785050047,0.19,0.50,0.11,0.15,0.22,0.29,0.38 2011-03-25 11:35:41,75.121890848,-130.68505588,0.15,0.37,0.09,0.12,0.19,0.25,0.30 2011-03-25 11:36:52,75.207902856,-130.583835169,0.18,0.37,0.10,0.14,0.21,0.28,0.33 2011-03-25 11:38:04,75.293944569,-130.482429095,0.16,0.35,0.08,0.13,0.19,0.23,0.26 2011-03-25 11:39:14,75.37995328,-130.38001098,0.17,0.52,0.09,0.13,0.20,0.27,0.41 2011-03-25 11:40:25,75.465899435,-130.276186341,0.18,0.40,0.11,0.14,0.22,0.28,0.34 2011-03-25 11:41:35,75.551756038,-130.170598097,0.17,0.42,0.09,0.13,0.21,0.28,0.33 2011-03-25 11:42:45,75.637626952,-130.064560457,0.17,0.53,0.09,0.12,0.20,0.28,0.38 2011-03-25 11:43:55,75.72339682,-129.956582018,0.16,0.42,0.09,0.12,0.18,0.24,0.32 2011-03-25 11:45:04,75.809263841,-129.849232622,0.18,0.58,0.09,0.13,0.21,0.33,0.45 2011-03-25 11:46:14,75.894960967,-129.739028938,0.16,0.47,0.09,0.13,0.19,0.27,0.31 2011-03-25 11:47:24,75.980627681,-129.627790614,0.17,0.44,0.10,0.13,0.20,0.28,0.35 2011-03-25 11:48:33,76.0662578657,-129.515474623,0.17,0.44,0.09,0.13,0.21,0.28,0.35 2011-03-25 11:49:43,76.151823074,-129.401515134,0.20,0.46,0.11,0.15,0.24,0.34,0.43 2011-03-25 11:51:12,76.2611156544,-129.254553883,0.16,0.37,0.10,0.13,0.18,0.24,0.31 2011-03-25 11:54:55,76.5354599502,-128.874368224,0.20,0.65,0.09,0.14,0.24,0.34,0.49 2011-03-25 11:56:05,76.621603102,-128.752250258,0.19,0.44,0.12,0.15,0.23,0.29,0.32 2011-03-25 11:57:14,76.706898561,-128.630055424,0.19,0.44,0.11,0.14,0.23,0.31,0.37 2011-03-25 11:58:24,76.792063785,-128.505387278,0.20,0.49,0.11,0.14,0.23,0.35,0.43 2011-03-25 12:00:18,76.932222532,-128.297338188,0.17,0.47,0.11,0.13,0.20,0.29,0.35 2011-03-25 12:03:38,77.179423891,-127.92142531,0.20,0.53,0.11,0.15,0.24,0.33,0.42 2011-03-25 12:04:47,77.26435072,-127.789056112,0.19,0.41,0.11,0.14,0.22,0.30,0.34 2011-03-25 12:05:56,77.349191281,-127.654683673,0.19,0.41,0.11,0.14,0.22,0.31,0.37 2011-03-25 12:07:04,77.434126658,-127.520690615,0.19,0.72,0.10,0.13,0.23,0.33,0.44 2011-03-25 12:08:10,77.518670843,-127.380665002,0.16,0.47,0.09,0.12,0.19,0.29,0.38 2011-03-25 12:09:22,77.6086186207,-127.230952965,0.19,0.57,0.10,0.13,0.24,0.34,0.41 2011-03-25 12:15:22,78.023048565,-126.517671475,0.19,0.71,0.09,0.13,0.23,0.36,0.53 2011-03-25 12:16:37,78.1072987541,-126.366977516,0.15,0.40,0.08,0.12,0.19,0.25,0.31 2011-03-25 12:17:51,78.191426169,-126.213642135,0.18,0.75,0.09,0.13,0.22,0.35,0.50 2011-03-25 12:19:06,78.275494175,-126.058451603,0.17,0.56,0.09,0.12,0.21,0.31,0.42 2011-03-25 12:20:21,78.35949308,-125.901200979,0.20,0.71,0.09,0.13,0.25,0.37,0.52 2011-03-25 12:21:35,78.443443597,-125.742194456,0.17,0.44,0.09,0.12,0.20,0.29,0.37 2011-03-25 12:23:29,78.5699345376,-125.493195681,0.18,0.63,0.09,0.13,0.23,0.33,0.43 2011-03-25 12:29:21,78.9573432974,-124.710400265,0.21,0.78,0.08,0.14,0.26,0.40,0.54 2011-03-25 12:30:40,79.041797243,-124.532011816,0.21,0.56,0.10,0.14,0.26,0.36,0.44 2011-03-25 12:31:59,79.1262412657,-124.348338714,0.18,0.54,0.06,0.10,0.24,0.37,0.46 2011-03-25 12:33:26,79.2188453564,-124.147181903,0.19,2.28,0.07,0.11,0.22,0.38,0.65 2011-03-25 12:37:08,79.4599450395,-123.560038813,0.18,0.63,0.07,0.10,0.22,0.36,0.52 2011-03-25 13:10:07,81.6273840409,-117.192340237,0.14,0.48,0.04,0.09,0.18,0.31,0.39 2011-03-25 13:11:22,81.705822231,-116.890221114,0.19,0.63,0.05,0.11,0.24,0.42,0.56 2011-03-25 13:12:38,81.784114052,-116.58353919,0.24,0.83,0.10,0.16,0.29,0.45,0.61 2011-03-25 13:13:54,81.862155968,-116.270775642,0.15,0.60,0.06,0.10,0.18,0.28,0.41 2011-03-25 13:15:09,81.940020502,-115.952792962,0.16,1.09,0.08,0.11,0.19,0.30,0.49 2011-03-25 13:16:23,82.017617635,-115.628441876,0.16,0.68,0.08,0.11,0.18,0.29,0.51 2011-03-25 13:17:37,82.095011729,-115.298448669,0.18,0.68,0.08,0.12,0.22,0.31,0.38 2011-03-25 13:18:51,82.1721760821,-114.96241354,0.17,0.48,0.06,0.12,0.21,0.33,0.41 2011-03-25 13:20:06,82.248702429,-114.615260786,0.17,0.54,0.08,0.12,0.21,0.33,0.43 2011-03-25 13:21:22,82.3253920076,-114.266686556,0.23,0.56,0.11,0.17,0.28,0.36,0.44 2011-03-25 13:22:39,82.401658153,-113.909478535,0.21,0.48,0.12,0.16,0.25,0.34,0.41 2011-03-25 13:23:54,82.477528366,-113.543911136,0.20,0.50,0.11,0.16,0.24,0.32,0.41 2011-03-25 13:25:07,82.554306638,-113.168160486,0.17,0.61,0.09,0.13,0.21,0.28,0.36 2011-03-25 13:26:19,82.629954203,-112.786714376,0.17,0.55,0.09,0.13,0.21,0.31,0.45 2011-03-25 13:27:30,82.7049836045,-112.399379114,0.17,0.60,0.07,0.12,0.21,0.30,0.38 2011-03-25 13:28:42,82.7798159542,-112.002411333,0.18,0.61,0.10,0.14,0.21,0.29,0.38 2011-03-25 13:30:21,82.8801914717,-111.445898832,0.18,0.64,0.07,0.13,0.22,0.32,0.44 2011-03-25 13:38:24,83.3496478066,-108.6317665,0.16,0.87,0.06,0.10,0.20,0.32,0.44 2011-03-25 13:39:37,83.421208045,-108.1599106,0.17,0.59,0.06,0.10,0.22,0.33,0.44 2011-03-25 13:40:51,83.492127723,-107.676095229,0.21,0.73,0.08,0.14,0.26,0.40,0.58 2011-03-25 13:42:06,83.562642974,-107.182444894,0.16,0.42,0.07,0.11,0.20,0.30,0.37 2011-03-25 13:43:22,83.632582746,-106.676870624,0.19,0.49,0.09,0.14,0.23,0.35,0.42 2011-03-25 13:44:37,83.702084181,-106.160868599,0.19,0.52,0.08,0.13,0.24,0.33,0.42 2011-03-25 13:45:52,83.771008302,-105.632791282,0.21,0.66,0.09,0.15,0.26,0.37,0.47 2011-03-25 13:47:03,83.839596926,-105.095191856,0.20,0.69,0.07,0.14,0.25,0.40,0.51 2011-03-25 13:48:16,83.9075934268,-104.545133777,0.15,0.57,0.04,0.09,0.19,0.27,0.46 2011-03-25 13:49:30,83.9749129278,-103.981587435,0.22,0.70,0.08,0.14,0.29,0.43,0.53 2011-03-25 13:50:43,84.041693897,-103.405977251,0.23,0.60,0.12,0.17,0.28,0.37,0.46 2011-03-25 13:51:56,84.107761041,-102.816346199,0.19,0.54,0.07,0.12,0.24,0.38,0.44 2011-03-25 13:53:10,84.173431737,-102.215921475,0.22,0.70,0.10,0.15,0.26,0.38,0.48 2011-03-25 13:54:23,84.238355526,-101.600931005,0.18,0.66,0.07,0.12,0.23,0.36,0.48 2011-03-25 13:55:36,84.302716341,-100.973158009,0.17,0.71,0.08,0.12,0.21,0.33,0.52 2011-03-25 13:56:48,84.365728916,-100.324606242,0.24,0.59,0.09,0.14,0.32,0.47,0.54 2011-03-25 13:58:00,84.429092073,-99.672274448,0.20,0.80,0.08,0.13,0.26,0.37,0.50 2011-03-25 13:59:12,84.490917635,-98.997188406,0.20,0.62,0.10,0.14,0.25,0.38,0.53 2011-03-25 14:00:23,84.552826339,-98.315283376,0.20,0.70,0.08,0.12,0.26,0.43,0.56 2011-03-25 14:01:35,84.613533403,-97.613821982,0.19,0.57,0.09,0.14,0.24,0.33,0.42 2011-03-25 14:02:47,84.673352057,-96.895904625,0.18,0.69,0.08,0.12,0.21,0.34,0.47 2011-03-25 14:04:00,84.732345861,-96.162084414,0.21,0.60,0.10,0.14,0.26,0.37,0.47 2011-03-25 14:05:13,84.790750866,-95.414497235,0.17,0.66,0.09,0.13,0.20,0.30,0.47 2011-03-25 14:06:27,84.847732024,-94.645391369,0.18,0.69,0.08,0.13,0.22,0.32,0.40 2011-03-25 14:07:40,84.90402234,-93.861523889,0.21,0.54,0.10,0.15,0.26,0.35,0.43 2011-03-25 14:08:53,84.9593582472,-93.0604843652,0.22,0.73,0.10,0.15,0.27,0.42,0.52 2011-03-25 14:10:06,85.013708086,-92.242003999,0.22,0.89,0.10,0.15,0.27,0.39,0.59 2011-03-25 14:11:18,85.067147693,-91.406756134,0.22,0.61,0.10,0.16,0.27,0.38,0.49 2011-03-25 14:12:31,85.119336039,-90.55192499,0.22,0.52,0.11,0.17,0.27,0.38,0.46 2011-03-25 14:13:43,85.170559826,-89.680008117,0.24,0.77,0.10,0.16,0.28,0.45,0.56 2011-03-25 14:14:55,85.22064346,-88.789590489,0.21,0.61,0.11,0.15,0.25,0.38,0.47 2011-03-25 14:16:08,85.269635307,-87.881211738,0.20,0.58,0.09,0.14,0.24,0.35,0.45 2011-03-25 14:17:22,85.317285406,-86.953100142,0.20,0.62,0.10,0.14,0.24,0.35,0.44 2011-03-25 14:18:36,85.363916214,-86.007884483,0.20,0.65,0.10,0.14,0.24,0.34,0.45 2011-03-25 14:19:50,85.409105565,-85.042724867,0.21,0.82,0.11,0.16,0.24,0.34,0.50 2011-03-25 14:21:04,85.452958516,-84.058509567,0.20,0.47,0.10,0.14,0.25,0.35,0.41 2011-03-25 14:22:18,85.495576566,-83.056175296,0.19,0.64,0.09,0.13,0.22,0.34,0.47 2011-03-25 14:23:32,85.536729971,-82.034627329,0.19,0.59,0.09,0.14,0.23,0.35,0.45 2011-03-25 14:24:46,85.576603909,-80.995403767,0.18,0.58,0.09,0.12,0.21,0.34,0.49 2011-03-25 14:25:26,85.5973441798,-80.4201037753,0.22,0.42,0.12,0.16,0.27,0.30,0.41