# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20100402.10km.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 2010-04-02 11:35:40,74.36209276,-77.446163952,0.28,0.56,0.14,0.22,0.32,0.43,0.51 2010-04-02 11:36:46,74.350804193,-77.776751601,0.29,0.60,0.13,0.20,0.36,0.45,0.53 2010-04-02 11:37:53,74.3392104345,-78.1075000299,0.37,0.96,0.15,0.29,0.45,0.54,0.63 2010-04-02 11:39:00,74.327003503,-78.4421541661,0.26,0.63,0.07,0.21,0.31,0.41,0.55 2010-04-02 11:40:08,74.314236609,-78.7760736353,0.35,0.69,0.22,0.29,0.40,0.49,0.58 2010-04-02 11:41:14,74.300965096,-79.1049240371,0.29,0.62,0.09,0.17,0.40,0.50,0.58 2010-04-02 11:42:20,74.287434734,-79.433287963,0.17,0.31,0.11,0.14,0.20,0.25,0.28 2010-04-02 11:43:26,74.2733944492,-79.7607803886,0.21,0.64,0.10,0.15,0.25,0.42,0.52 2010-04-02 11:44:32,74.258854026,-80.087684473,0.30,0.71,0.12,0.23,0.37,0.48,0.60 2010-04-02 11:45:38,74.243766724,-80.41459911,0.14,0.36,0.06,0.09,0.19,0.27,0.30 2010-04-02 11:46:44,74.2283003182,-80.7403432814,0.22,0.53,0.09,0.14,0.29,0.37,0.42 2010-04-02 11:47:49,74.212273512,-81.065379484,0.15,0.49,0.07,0.10,0.18,0.26,0.31 2010-04-02 11:48:55,74.195763353,-81.389881638,0.23,0.56,0.11,0.16,0.28,0.37,0.42 2010-04-02 11:50:02,74.178589048,-81.713677725,0.19,0.59,0.07,0.15,0.24,0.32,0.39 2010-04-02 11:51:09,74.161090522,-82.036681183,0.22,0.53,0.08,0.18,0.26,0.33,0.40 2010-04-02 11:52:16,74.14324661,-82.359077756,0.16,0.35,0.08,0.12,0.18,0.25,0.31 2010-04-02 11:53:10,74.128539829,-82.6176999859,0.15,0.29,0.08,0.11,0.18,0.25,0.27 2010-04-02 11:56:30,74.1151220358,-83.5870823488,0.13,0.37,0.07,0.09,0.15,0.20,0.25 2010-04-02 11:57:37,74.1220363761,-83.9157682259,0.18,0.47,0.07,0.12,0.23,0.30,0.40 2010-04-02 11:58:44,74.12890123,-84.243221539,0.20,0.44,0.09,0.16,0.23,0.31,0.39 2010-04-02 11:59:50,74.135236296,-84.570949346,0.17,0.39,0.07,0.12,0.21,0.27,0.31 2010-04-02 12:00:56,74.1410401161,-84.8992547229,0.16,0.44,0.07,0.10,0.20,0.30,0.37 2010-04-02 12:02:03,74.1463428684,-85.227792081,0.18,0.44,0.07,0.13,0.23,0.31,0.36 2010-04-02 12:03:09,74.151228846,-85.556189437,0.18,0.41,0.07,0.12,0.23,0.31,0.36 2010-04-02 12:04:16,74.15557712,-85.88478012,0.16,0.39,0.05,0.11,0.20,0.28,0.33 2010-04-02 12:05:22,74.1593861834,-86.2138509988,0.18,0.46,0.05,0.11,0.24,0.35,0.41 2010-04-02 12:06:28,74.162763955,-86.542774499,0.20,0.39,0.09,0.15,0.25,0.31,0.36 2010-04-02 12:07:35,74.1656601152,-86.8717990221,0.24,0.55,0.11,0.17,0.30,0.39,0.46 2010-04-02 12:08:41,74.1680191722,-87.2010759233,0.25,0.51,0.13,0.19,0.30,0.39,0.44 2010-04-02 12:09:47,74.169788495,-87.530647028,0.22,0.45,0.06,0.16,0.28,0.36,0.41 2010-04-02 12:10:52,74.171231025,-87.860021287,0.23,0.47,0.10,0.18,0.28,0.34,0.42 2010-04-02 12:11:55,74.1719959074,-88.1706797889,0.20,0.45,0.08,0.14,0.25,0.36,0.41 2010-04-02 12:14:20,74.2147815522,-88.8744694271,0.24,0.50,0.12,0.18,0.29,0.36,0.41 2010-04-02 12:15:26,74.236571301,-89.195054083,0.23,0.55,0.11,0.17,0.28,0.36,0.45 2010-04-02 12:16:31,74.2580092431,-89.5164769838,0.19,0.72,0.08,0.14,0.24,0.32,0.42 2010-04-02 12:17:37,74.27891582,-89.838921136,0.21,0.74,0.07,0.11,0.26,0.54,0.64 2010-04-02 12:18:42,74.299406621,-90.161923454,0.20,0.61,0.07,0.12,0.25,0.37,0.47 2010-04-02 12:19:47,74.319377005,-90.485774883,0.20,0.50,0.08,0.14,0.26,0.35,0.43 2010-04-02 12:20:53,74.3388868468,-90.8108674228,0.21,0.44,0.08,0.17,0.25,0.32,0.38 2010-04-02 12:21:58,74.357962461,-91.1364712,0.24,0.54,0.13,0.19,0.29,0.37,0.47 2010-04-02 12:23:03,74.37657753,-91.462598175,0.20,0.44,0.10,0.16,0.23,0.30,0.41 2010-04-02 12:24:09,74.3946033049,-91.789815117,0.23,0.56,0.08,0.15,0.29,0.40,0.45 2010-04-02 12:25:15,74.4124938164,-92.1227937862,0.23,0.53,0.10,0.17,0.28,0.37,0.46 2010-04-02 12:26:20,74.429615403,-92.451148944,0.23,0.46,0.12,0.18,0.27,0.36,0.42 2010-04-02 12:27:26,74.446234609,-92.780209026,0.21,0.52,0.10,0.16,0.25,0.36,0.42 2010-04-02 12:28:04,74.4556311962,-92.9710248608,0.13,0.22,0.09,0.11,0.15,0.20,0.22 2010-04-02 12:34:27,74.4286526892,-94.910528962,0.21,0.76,0.07,0.13,0.28,0.39,0.47 2010-04-02 12:40:55,74.4158832815,-96.8729585115,0.23,0.71,0.07,0.13,0.30,0.43,0.54 2010-04-02 12:42:01,74.432001004,-97.202147497,0.25,0.61,0.08,0.17,0.33,0.41,0.50 2010-04-02 12:43:06,74.4469039787,-97.5323810144,0.20,0.46,0.10,0.15,0.25,0.32,0.40 2010-04-02 12:44:12,74.461318846,-97.8635040776,0.13,0.38,0.05,0.08,0.16,0.30,0.34 2010-04-02 12:45:17,74.475545314,-98.195513192,0.19,0.41,0.06,0.13,0.25,0.32,0.36 2010-04-02 12:46:22,74.489156131,-98.527483975,0.19,0.46,0.06,0.11,0.24,0.35,0.42 2010-04-02 12:47:27,74.502212524,-98.860038413,0.19,0.54,0.06,0.12,0.25,0.34,0.41 2010-04-02 12:48:32,74.5065688333,-99.1970107228,0.22,0.46,0.12,0.17,0.25,0.34,0.42 2010-04-02 12:49:37,74.508893189,-99.533622414,0.26,0.66,0.14,0.20,0.32,0.44,0.53 2010-04-02 12:50:42,74.510675281,-99.869910066,0.23,0.88,0.12,0.17,0.27,0.39,0.55 2010-04-02 12:51:47,74.511953401,-100.206261636,0.21,0.53,0.10,0.16,0.26,0.36,0.42 2010-04-02 12:52:52,74.5127469632,-100.543653536,0.20,0.55,0.10,0.15,0.24,0.32,0.39 2010-04-02 12:53:57,74.513033604,-100.880084751,0.19,0.55,0.11,0.14,0.22,0.32,0.39 2010-04-02 12:55:02,74.512737614,-101.216502408,0.19,0.54,0.10,0.13,0.22,0.32,0.43 2010-04-02 12:56:07,74.511998027,-101.553248624,0.15,0.40,0.09,0.11,0.18,0.26,0.32 2010-04-02 12:57:13,74.510720887,-101.890265382,0.17,0.38,0.08,0.12,0.20,0.28,0.32 2010-04-02 12:58:18,74.508934269,-102.22655365,0.14,0.43,0.07,0.10,0.17,0.25,0.36 2010-04-02 12:59:23,74.506681879,-102.562760122,0.16,0.44,0.07,0.11,0.19,0.27,0.38 2010-04-02 13:00:29,74.503884462,-102.899574807,0.16,0.43,0.07,0.10,0.21,0.33,0.39 2010-04-02 13:01:34,74.500624726,-103.235834427,0.16,0.53,0.07,0.11,0.19,0.25,0.37 2010-04-02 13:02:40,74.496817894,-103.5716524,0.18,0.54,0.12,0.15,0.21,0.27,0.35 2010-04-02 13:03:46,74.4924902012,-103.907403068,0.18,0.48,0.07,0.11,0.24,0.35,0.41 2010-04-02 13:04:52,74.487615269,-104.243747643,0.21,0.57,0.09,0.16,0.26,0.35,0.42 2010-04-02 13:05:58,74.482269077,-104.578981338,0.13,0.41,0.07,0.09,0.16,0.24,0.32 2010-04-02 13:07:04,74.476414709,-104.913977611,0.11,0.38,0.07,0.08,0.13,0.17,0.22 2010-04-02 13:08:10,74.4700590235,-105.24914337,0.13,0.32,0.08,0.10,0.15,0.21,0.25 2010-04-02 13:09:16,74.463217352,-105.584314452,0.11,0.30,0.07,0.08,0.13,0.20,0.24 2010-04-02 13:10:10,74.4572283779,-105.85919349,0.11,0.28,0.08,0.08,0.12,0.18,0.24 2010-04-02 13:13:10,74.40425445,-106.746735935,0.13,0.34,0.08,0.11,0.15,0.19,0.23 2010-04-02 13:14:16,74.377075797,-107.064962249,0.14,0.29,0.08,0.11,0.16,0.23,0.27 2010-04-02 13:15:22,74.349734401,-107.382443937,0.13,0.33,0.08,0.11,0.16,0.20,0.24 2010-04-02 13:16:29,74.3214114137,-107.704134778,0.12,0.30,0.08,0.10,0.14,0.18,0.23 2010-04-02 13:17:35,74.293146473,-108.020115985,0.12,0.29,0.08,0.09,0.15,0.19,0.25 2010-04-02 13:18:41,74.264496267,-108.334336901,0.13,0.30,0.09,0.11,0.15,0.19,0.24 2010-04-02 13:19:48,74.235275531,-108.647701758,0.11,0.33,0.08,0.09,0.13,0.19,0.24 2010-04-02 13:20:54,74.205632487,-108.960506325,0.13,0.29,0.09,0.10,0.15,0.20,0.24 2010-04-02 13:21:59,74.175583826,-109.27124447,0.11,0.21,0.09,0.09,0.12,0.15,0.18 2010-04-02 13:23:05,74.145160242,-109.58091284,0.11,0.25,0.08,0.09,0.12,0.15,0.20 2010-04-02 13:24:11,74.1141304493,-109.890772483,0.10,0.31,0.08,0.09,0.11,0.14,0.19 2010-04-02 13:25:17,74.082321981,-110.200348559,0.13,0.43,0.08,0.10,0.16,0.24,0.32 2010-04-02 13:26:15,74.0539437102,-110.473711551,0.11,0.25,0.07,0.09,0.12,0.17,0.21 2010-04-02 13:32:23,74.0419307487,-112.302217783,0.11,0.32,0.08,0.09,0.12,0.16,0.20 2010-04-02 13:39:27,74.13350154,-114.25475784,0.14,0.30,0.07,0.10,0.17,0.24,0.26 2010-04-02 13:40:33,74.181182522,-114.536017859,0.13,0.26,0.08,0.10,0.16,0.20,0.23 2010-04-02 13:41:38,74.228510032,-114.816524632,0.12,0.30,0.07,0.09,0.14,0.19,0.23 2010-04-02 13:42:43,74.275698394,-115.098166714,0.13,0.37,0.07,0.10,0.15,0.20,0.26 2010-04-02 13:43:48,74.322512669,-115.382152139,0.13,0.25,0.08,0.10,0.16,0.21,0.23 2010-04-02 13:44:54,74.368954858,-115.667622152,0.13,0.31,0.07,0.09,0.18,0.23,0.28 2010-04-02 13:46:24,74.4318287325,-116.059827191,0.07,0.15,0.05,0.06,0.07,0.08,0.11 2010-04-02 13:47:37,74.4827398018,-116.384295745,0.06,0.08,0.06,0.06,0.07,0.07,0.07 2010-04-02 13:48:42,74.527824271,-116.675356816,0.06,0.07,0.06,0.06,0.06,0.07,0.07 2010-04-02 13:49:48,74.5725565828,-116.967788579,0.06,0.08,0.06,0.06,0.07,0.07,0.07 2010-04-02 13:50:53,74.616800061,-117.26209154,0.06,0.10,0.05,0.06,0.07,0.08,0.09 2010-04-02 13:51:58,74.660780274,-117.558612363,0.06,0.11,0.05,0.05,0.07,0.09,0.10 2010-04-02 13:53:03,74.703867543,-117.857278425,0.08,0.16,0.05,0.06,0.09,0.11,0.14 2010-04-02 13:54:08,74.743271877,-118.163730312,0.09,0.23,0.05,0.06,0.11,0.15,0.19 2010-04-02 13:55:13,74.7826427883,-118.471081988,0.07,0.18,0.05,0.05,0.07,0.10,0.15 2010-04-02 13:56:18,74.821000063,-118.781475225,0.09,0.33,0.05,0.06,0.10,0.15,0.21 2010-04-02 13:57:22,74.858728782,-119.093211783,0.08,0.19,0.05,0.06,0.09,0.14,0.17 2010-04-02 13:58:27,74.896186736,-119.406182507,0.09,0.27,0.05,0.06,0.10,0.15,0.20 2010-04-02 13:59:32,74.933268519,-119.720946921,0.11,0.43,0.07,0.08,0.13,0.20,0.31 2010-04-02 14:00:38,74.969862808,-120.03730381,0.12,0.35,0.07,0.08,0.14,0.21,0.28 2010-04-02 14:01:44,75.005981093,-120.354846272,0.15,0.40,0.07,0.10,0.18,0.27,0.32 2010-04-02 14:02:51,75.041564037,-120.674032209,0.09,0.22,0.05,0.07,0.11,0.16,0.18 2010-04-02 14:03:58,75.076888614,-120.994747748,0.10,0.27,0.07,0.08,0.12,0.16,0.21 2010-04-02 14:05:05,75.11163591,-121.316814507,0.10,0.34,0.05,0.07,0.12,0.17,0.25 2010-04-02 14:06:12,75.145898928,-121.640372744,0.08,0.27,0.05,0.06,0.10,0.13,0.21 2010-04-02 14:07:19,75.179807021,-121.965516982,0.09,0.38,0.06,0.07,0.10,0.15,0.21 2010-04-02 14:11:01,75.2896777502,-123.067794695,0.11,0.42,0.06,0.08,0.13,0.20,0.27 2010-04-02 14:12:50,75.3422086543,-123.611877407,0.11,0.36,0.06,0.07,0.13,0.22,0.30