# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20180404.10km.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 2018-04-04 12:33:39,81.9857963824,-93.6929918961,0.22,0.69,0.09,0.15,0.28,0.43,0.55 2018-04-04 12:34:58,82.066313528,-93.849656007,0.22,0.56,0.11,0.16,0.27,0.38,0.44 2018-04-04 12:36:22,82.152937742,-94.022941363,0.22,0.54,0.10,0.15,0.27,0.38,0.46 2018-04-04 12:37:50,82.239492115,-94.20006329,0.20,0.50,0.10,0.14,0.24,0.34,0.40 2018-04-04 12:39:18,82.325983379,-94.380807298,0.24,0.47,0.14,0.20,0.28,0.36,0.42 2018-04-04 12:40:46,82.41241587,-94.565055126,0.22,0.50,0.10,0.16,0.26,0.38,0.47 2018-04-04 12:42:12,82.498770147,-94.753566284,0.21,0.63,0.12,0.16,0.25,0.34,0.46 2018-04-04 12:43:39,82.585039628,-94.946431795,0.29,0.68,0.13,0.20,0.36,0.49,0.56 2018-04-04 12:45:05,82.671225204,-95.143835197,0.17,0.45,0.05,0.11,0.22,0.30,0.39 2018-04-04 12:46:31,82.757327439,-95.345814712,0.18,0.49,0.09,0.13,0.22,0.30,0.39 2018-04-04 12:47:58,82.843359401,-95.551970971,0.22,0.60,0.11,0.16,0.25,0.39,0.47 2018-04-04 12:49:24,82.929302474,-95.763375166,0.20,0.58,0.11,0.15,0.23,0.33,0.45 2018-04-04 12:50:50,83.015159086,-95.979221164,0.19,0.50,0.09,0.13,0.24,0.37,0.43 2018-04-04 12:52:16,83.100878342,-96.201131628,0.18,0.41,0.09,0.14,0.22,0.31,0.37 2018-04-04 12:53:42,83.186521874,-96.428067395,0.20,0.51,0.07,0.14,0.26,0.35,0.42 2018-04-04 12:55:08,83.272073243,-96.660589585,0.18,0.50,0.09,0.13,0.21,0.31,0.38 2018-04-04 12:56:34,83.35751195,-96.898785821,0.16,0.47,0.09,0.11,0.18,0.27,0.36 2018-04-04 12:58:00,83.442850299,-97.142683426,0.16,0.65,0.08,0.12,0.20,0.27,0.34 2018-04-04 12:59:14,83.5163859748,-97.3590921745,0.18,0.49,0.09,0.13,0.21,0.31,0.39 2018-04-04 13:00:51,83.613142901,-97.650838758,0.15,0.72,0.08,0.10,0.18,0.29,0.40 2018-04-04 13:02:17,83.698106658,-97.914801905,0.20,0.43,0.09,0.13,0.25,0.34,0.38 2018-04-04 13:03:42,83.782961175,-98.185223304,0.17,1.11,0.07,0.11,0.21,0.32,0.53 2018-04-04 13:05:07,83.867673211,-98.463168212,0.13,0.35,0.07,0.09,0.15,0.23,0.29 2018-04-04 13:06:32,83.952243439,-98.748703609,0.16,0.44,0.08,0.11,0.20,0.28,0.36 2018-04-04 13:07:57,84.03666155,-99.0422711,0.17,0.48,0.09,0.13,0.21,0.30,0.34 2018-04-04 13:09:22,84.120917971,-99.344272073,0.15,0.51,0.08,0.11,0.19,0.28,0.37 2018-04-04 13:10:48,84.205031957,-99.654406921,0.17,0.60,0.09,0.13,0.21,0.28,0.33 2018-04-04 13:12:13,84.288986925,-99.973236095,0.17,0.44,0.09,0.12,0.21,0.31,0.37 2018-04-04 13:13:39,84.372751811,-100.301734813,0.17,0.48,0.10,0.13,0.20,0.29,0.36 2018-04-04 13:15:04,84.456333489,-100.639986379,0.16,0.38,0.09,0.12,0.18,0.24,0.28 2018-04-04 13:16:30,84.539714062,-100.988591766,0.15,0.42,0.07,0.11,0.18,0.25,0.31 2018-04-04 13:17:55,84.622898676,-101.347687894,0.16,0.48,0.08,0.12,0.19,0.28,0.37 2018-04-04 13:19:21,84.705903109,-101.71713014,0.15,0.42,0.07,0.11,0.18,0.25,0.32 2018-04-04 13:20:47,84.788662664,-102.09887727,0.13,0.30,0.07,0.10,0.16,0.22,0.27 2018-04-04 13:22:13,84.871209845,-102.492164186,0.15,0.35,0.09,0.12,0.17,0.23,0.29 2018-04-04 13:23:39,84.953494415,-102.898727054,0.13,0.39,0.08,0.10,0.16,0.23,0.30 2018-04-04 13:25:05,85.035525206,-103.318450098,0.20,0.77,0.09,0.14,0.25,0.36,0.48 2018-04-04 13:26:30,85.117318679,-103.751249663,0.15,0.60,0.07,0.10,0.17,0.27,0.36 2018-04-04 13:27:55,85.198832859,-104.198549961,0.14,0.47,0.08,0.11,0.17,0.25,0.34 2018-04-04 13:29:19,85.280045394,-104.661235271,0.14,0.45,0.06,0.10,0.18,0.25,0.29 2018-04-04 13:30:26,85.3447984917,-105.042443832,0.15,0.40,0.09,0.11,0.17,0.22,0.32 2018-04-04 13:36:56,85.592844831,-109.076480722,0.20,0.51,0.10,0.14,0.23,0.35,0.44 2018-04-04 13:38:18,85.627489005,-110.159309505,0.17,0.50,0.07,0.11,0.21,0.30,0.39 2018-04-04 13:39:41,85.660578589,-111.258897867,0.16,0.40,0.08,0.11,0.19,0.25,0.31 2018-04-04 13:41:03,85.691988204,-112.375163433,0.19,0.52,0.09,0.15,0.23,0.31,0.38 2018-04-04 13:42:26,85.721795039,-113.50713114,0.16,0.47,0.09,0.12,0.19,0.27,0.33 2018-04-04 13:43:49,85.749906282,-114.654513509,0.16,0.46,0.08,0.11,0.19,0.29,0.39 2018-04-04 13:45:12,85.776280186,-115.816824922,0.16,0.47,0.09,0.12,0.19,0.26,0.30 2018-04-04 13:46:36,85.800908439,-116.993166311,0.20,0.63,0.09,0.14,0.25,0.37,0.47 2018-04-04 13:47:59,85.823609442,-118.1832679,0.18,0.52,0.08,0.14,0.22,0.28,0.40 2018-04-04 13:49:22,85.844607678,-119.385454734,0.21,0.52,0.11,0.15,0.26,0.37,0.44 2018-04-04 13:50:46,85.863724784,-120.599470457,0.17,0.42,0.09,0.12,0.21,0.30,0.36 2018-04-04 13:52:09,85.880951442,-121.824010831,0.13,0.33,0.07,0.09,0.16,0.23,0.29 2018-04-04 13:53:33,85.89636421,-123.058441925,0.15,0.41,0.09,0.11,0.18,0.25,0.33 2018-04-04 13:54:58,85.909890164,-124.301482807,0.14,0.35,0.08,0.10,0.16,0.22,0.27 2018-04-04 13:56:24,85.921473191,-125.55206151,0.15,0.40,0.09,0.11,0.18,0.26,0.32 2018-04-04 13:57:49,85.931144956,-126.809220422,0.16,0.36,0.09,0.12,0.19,0.27,0.33 2018-04-04 13:59:13,85.93882284,-128.071863534,0.14,0.38,0.06,0.10,0.17,0.24,0.31 2018-04-04 14:00:38,85.944543573,-129.338669246,0.15,0.40,0.07,0.11,0.19,0.27,0.34 2018-04-04 14:02:03,85.948123981,-130.608362523,0.16,0.39,0.08,0.12,0.19,0.25,0.33 2018-04-04 14:03:27,85.949797499,-131.879742903,0.20,0.49,0.10,0.14,0.24,0.34,0.44 2018-04-04 14:04:51,85.949565556,-133.15160466,0.17,0.38,0.09,0.13,0.20,0.26,0.31 2018-04-04 14:06:14,85.947269329,-134.422598268,0.17,0.43,0.09,0.13,0.20,0.26,0.33 2018-04-04 14:07:36,85.942939705,-135.691457385,0.18,0.58,0.08,0.12,0.21,0.38,0.47 2018-04-04 14:08:59,85.936640286,-136.957050277,0.14,0.41,0.07,0.10,0.17,0.24,0.30 2018-04-04 14:10:23,85.928512084,-138.218373437,0.15,0.43,0.09,0.12,0.18,0.26,0.32 2018-04-04 14:11:46,85.918400915,-139.473970273,0.15,0.44,0.07,0.10,0.18,0.25,0.31 2018-04-04 14:13:10,85.906353711,-140.722818516,0.13,0.30,0.07,0.09,0.16,0.22,0.26 2018-04-04 14:14:33,85.892291167,-141.963524154,0.16,0.42,0.09,0.12,0.18,0.26,0.33 2018-04-04 14:15:56,85.87629604,-143.195159082,0.18,0.60,0.08,0.12,0.22,0.32,0.37 2018-04-04 14:17:20,85.858418683,-144.416804691,0.16,0.47,0.08,0.12,0.19,0.26,0.37 2018-04-04 14:18:44,85.838814902,-145.627759536,0.16,0.64,0.09,0.12,0.18,0.25,0.34 2018-04-04 14:19:56,85.8204643222,-146.657822194,0.15,0.42,0.09,0.12,0.18,0.25,0.31 2018-04-04 14:28:08,86.15472958,-149.995109209,0.14,0.74,0.07,0.10,0.16,0.22,0.27 2018-04-04 14:29:26,86.244559864,-149.996845707,0.13,0.48,0.06,0.09,0.16,0.24,0.32 2018-04-04 14:30:44,86.334391352,-149.996934552,0.16,0.58,0.08,0.12,0.19,0.26,0.32 2018-04-04 14:32:02,86.424223516,-149.996971721,0.16,0.42,0.08,0.12,0.19,0.27,0.35 2018-04-04 14:33:20,86.514055486,-149.996732625,0.15,0.55,0.07,0.10,0.17,0.26,0.41 2018-04-04 14:34:38,86.603886255,-149.996854735,0.13,0.42,0.07,0.10,0.15,0.20,0.27 2018-04-04 14:35:56,86.693718528,-149.996699456,0.12,0.36,0.06,0.08,0.15,0.23,0.27 2018-04-04 14:37:13,86.783547973,-149.996254541,0.13,0.41,0.06,0.08,0.15,0.25,0.32 2018-04-04 14:38:31,86.873373379,-149.996157082,0.14,0.53,0.07,0.09,0.16,0.25,0.33 2018-04-04 14:39:49,86.963203776,-149.997725463,0.13,0.36,0.06,0.09,0.15,0.23,0.29 2018-04-04 14:41:07,87.05304361,-149.993120367,0.15,0.46,0.06,0.11,0.18,0.30,0.39 2018-04-04 14:42:25,87.142884161,-149.995522849,0.14,0.51,0.07,0.11,0.17,0.24,0.33 2018-04-04 14:43:43,87.23272194,-149.996784831,0.15,0.53,0.08,0.10,0.18,0.29,0.41 2018-04-04 14:45:00,87.322549071,-149.992011148,0.15,0.52,0.07,0.10,0.18,0.27,0.33 2018-04-04 14:46:17,87.412381071,-149.995763371,0.15,0.43,0.07,0.10,0.18,0.28,0.39 2018-04-04 14:47:35,87.502211116,-149.995776137,0.15,0.41,0.06,0.11,0.19,0.27,0.34 2018-04-04 14:48:52,87.592046173,-149.995229035,0.13,0.41,0.06,0.09,0.16,0.24,0.32 2018-04-04 14:50:09,87.6818786307,-149.995544346,0.17,1.11,0.08,0.11,0.19,0.30,0.83 2018-04-04 14:51:26,87.77170915,-149.995206159,0.14,0.36,0.07,0.10,0.18,0.25,0.31 2018-04-04 14:52:43,87.861537195,-149.994336616,0.14,0.39,0.07,0.10,0.17,0.24,0.30 2018-04-04 14:53:59,87.951370425,-149.995061648,0.13,0.40,0.06,0.09,0.16,0.23,0.33 2018-04-04 14:55:16,88.041202085,-149.994739966,0.13,0.30,0.06,0.10,0.16,0.22,0.28 2018-04-04 14:56:33,88.131032571,-149.99375167,0.13,0.37,0.07,0.09,0.15,0.22,0.27 2018-04-04 14:57:49,88.220860335,-149.994409878,0.13,0.35,0.07,0.10,0.14,0.21,0.28 2018-04-04 14:59:05,88.31069112,-149.993619624,0.12,0.34,0.07,0.09,0.14,0.21,0.28 2018-04-04 15:00:22,88.400519791,-149.993350909,0.12,0.41,0.07,0.09,0.15,0.22,0.32 2018-04-04 15:01:38,88.490350281,-149.992769863,0.17,2.12,0.09,0.12,0.18,0.28,0.61 2018-04-04 15:02:55,88.580176479,-149.992291419,0.17,0.53,0.08,0.12,0.21,0.30,0.41 2018-04-04 15:04:11,88.670007569,-149.991550595,0.15,0.37,0.07,0.10,0.19,0.27,0.33 2018-04-04 15:05:27,88.759838764,-149.991105905,0.16,0.57,0.08,0.11,0.20,0.29,0.43 2018-04-04 15:06:43,88.849669348,-149.992133167,0.15,0.41,0.07,0.10,0.18,0.27,0.33 2018-04-04 15:07:59,88.939492285,-149.99121188,0.15,0.43,0.07,0.11,0.18,0.26,0.36 2018-04-04 15:09:15,89.029326022,-149.990924451,0.13,0.44,0.06,0.09,0.16,0.21,0.30 2018-04-04 15:10:31,89.119152058,-149.989701895,0.13,0.31,0.07,0.09,0.16,0.23,0.26 2018-04-04 15:11:47,89.208973088,-149.989281127,0.12,0.34,0.07,0.09,0.14,0.20,0.27 2018-04-04 15:13:04,89.29879651,-149.987741848,0.14,0.54,0.07,0.09,0.16,0.26,0.34 2018-04-04 15:14:20,89.388623973,-149.986907518,0.17,0.42,0.07,0.12,0.21,0.29,0.35 2018-04-04 15:15:36,89.478450895,-149.982519416,0.13,0.36,0.08,0.10,0.16,0.22,0.28 2018-04-04 15:16:52,89.568286073,-149.983215545,0.14,0.51,0.07,0.09,0.18,0.25,0.31 2018-04-04 15:18:08,89.658114429,-149.978589141,0.15,0.52,0.08,0.11,0.18,0.27,0.33 2018-04-04 15:19:24,89.747946821,-149.99634247,0.14,0.34,0.08,0.10,0.16,0.23,0.29 2018-04-04 15:20:40,89.837782689,-149.91570685,0.13,0.29,0.07,0.10,0.15,0.20,0.25 2018-04-04 15:21:32,89.9001726298,-149.352914373,0.12,0.35,0.04,0.09,0.15,0.20,0.28 2018-04-04 15:33:19,89.302905494,-18.292416448,0.20,0.44,0.09,0.15,0.25,0.34,0.38 2018-04-04 15:34:37,89.213419045,-18.903849171,0.17,0.39,0.08,0.11,0.21,0.30,0.35 2018-04-04 15:35:57,89.123856672,-19.385638874,0.09,0.30,0.03,0.05,0.12,0.19,0.25 2018-04-04 15:37:16,89.034248083,-19.781090813,0.12,0.42,0.04,0.07,0.16,0.23,0.30 2018-04-04 15:38:35,88.944602048,-20.110337804,0.13,0.49,0.07,0.10,0.15,0.23,0.33 2018-04-04 15:39:54,88.854926457,-20.386195561,0.13,0.34,0.07,0.09,0.15,0.22,0.29 2018-04-04 15:41:13,88.765229309,-20.622099521,0.13,0.27,0.06,0.09,0.16,0.21,0.24 2018-04-04 15:42:33,88.675513869,-20.826604979,0.14,0.36,0.07,0.10,0.16,0.24,0.33 2018-04-04 15:43:53,88.585783317,-21.005374336,0.15,0.37,0.07,0.10,0.19,0.25,0.30 2018-04-04 15:45:13,88.496039472,-21.16128888,0.15,0.43,0.07,0.11,0.19,0.27,0.33 2018-04-04 15:46:33,88.406288311,-21.299727081,0.15,0.43,0.07,0.10,0.18,0.26,0.33 2018-04-04 15:47:53,88.316529735,-21.425177556,0.13,0.45,0.06,0.09,0.16,0.26,0.32 2018-04-04 15:49:13,88.226761402,-21.5368311,0.14,0.67,0.04,0.08,0.19,0.29,0.37 2018-04-04 15:50:33,88.136985647,-21.63885476,0.12,0.41,0.03,0.06,0.16,0.24,0.30 2018-04-04 15:51:53,88.047207429,-21.731210875,0.12,0.40,0.03,0.06,0.17,0.26,0.33 2018-04-04 15:53:13,87.957423103,-21.815522364,0.17,0.42,0.03,0.11,0.22,0.32,0.38 2018-04-04 15:54:33,87.867636293,-21.889371018,0.13,0.61,0.03,0.07,0.17,0.24,0.42 2018-04-04 15:55:53,87.777874916,-21.959382697,0.12,0.38,0.03,0.06,0.17,0.24,0.31 2018-04-04 15:57:12,87.688103909,-22.024653135,0.15,0.48,0.07,0.10,0.17,0.26,0.34 2018-04-04 15:58:02,87.6320286466,-22.064313739,0.13,0.32,0.07,0.10,0.15,0.20,0.28 2018-04-04 16:03:09,87.369072008,-26.487024797,0.18,0.55,0.07,0.12,0.23,0.34,0.43 2018-04-04 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