# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20090425.10km.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 2009-04-25 11:55:54,78.201160999,-74.556882133,0.13,0.32,0.08,0.10,0.15,0.20,0.26 2009-04-25 11:57:26,78.2827422846,-74.3721311966,0.13,0.29,0.07,0.10,0.15,0.20,0.25 2009-04-25 11:58:57,78.3635674415,-74.1781035555,0.11,0.26,0.07,0.08,0.14,0.18,0.22 2009-04-25 12:00:23,78.4459586533,-73.9995241635,0.11,0.21,0.07,0.09,0.13,0.16,0.18 2009-04-25 12:01:44,78.529631972,-73.8355153905,0.13,0.29,0.07,0.09,0.16,0.21,0.24 2009-04-25 12:03:04,78.6121364038,-73.6526187968,0.14,0.29,0.08,0.11,0.16,0.20,0.24 2009-04-25 12:04:23,78.6941841435,-73.4647533667,0.14,0.31,0.07,0.11,0.17,0.22,0.25 2009-04-25 12:05:40,78.7756605137,-73.2710772166,0.14,0.29,0.08,0.11,0.16,0.21,0.25 2009-04-25 12:06:57,78.857352395,-73.0750724,0.14,0.25,0.09,0.11,0.16,0.20,0.22 2009-04-25 12:08:13,78.9387224861,-72.8752907196,0.13,0.42,0.08,0.09,0.16,0.21,0.25 2009-04-25 12:09:28,79.0198489368,-72.6734874872,0.11,0.28,0.08,0.08,0.13,0.17,0.20 2009-04-25 12:10:43,79.1011497343,-72.4682655799,0.11,0.38,0.07,0.08,0.13,0.18,0.21 2009-04-25 12:11:58,79.1829554038,-72.2574429798,0.14,0.27,0.07,0.09,0.18,0.21,0.22 2009-04-25 12:13:12,79.2636704127,-72.0463548976,0.14,0.37,0.07,0.09,0.17,0.21,0.27 2009-04-25 12:14:26,79.3446443538,-71.8309215994,0.12,0.25,0.08,0.10,0.14,0.16,0.19 2009-04-25 12:15:41,79.4259129217,-71.6110553201,0.11,0.91,0.07,0.08,0.13,0.18,0.21 2009-04-25 12:16:55,79.5062432073,-71.3901243468,0.13,0.29,0.08,0.11,0.15,0.20,0.24 2009-04-25 12:18:10,79.586363817,-71.1647121691,0.14,0.31,0.11,0.12,0.14,0.20,0.24 2009-04-25 12:19:25,79.6667830322,-70.9361310845,0.12,0.18,0.08,0.10,0.13,0.15,0.16 2009-04-25 12:20:40,79.7465270191,-70.7046665996,0.12,0.18,0.08,0.10,0.13,0.15,0.16 2009-04-25 12:21:55,79.8261807679,-70.4699092282,0.13,0.21,0.08,0.11,0.14,0.16,0.17 2009-04-25 12:23:10,79.9060973274,-70.2295668507,0.13,0.39,0.11,0.11,0.14,0.16,0.17 2009-04-25 12:24:25,79.9853344353,-69.98713939,0.13,0.19,0.11,0.12,0.14,0.16,0.17 2009-04-25 12:25:40,80.0643253393,-69.7401737972,0.14,0.18,0.12,0.13,0.15,0.16,0.17 2009-04-25 12:26:57,80.1437858522,-69.4889565165,0.13,0.24,0.11,0.12,0.14,0.16,0.17 2009-04-25 12:28:20,80.222340885,-69.232996348,0.14,0.20,0.11,0.12,0.15,0.17,0.18 2009-04-25 12:29:44,80.3009565136,-68.9756931602,0.14,0.21,0.11,0.12,0.15,0.17,0.18 2009-04-25 12:31:06,80.379416053,-68.7120431865,0.19,0.37,0.14,0.16,0.21,0.28,0.33 2009-04-25 12:32:31,80.4574560399,-68.4447449754,0.17,0.28,0.12,0.15,0.19,0.22,0.26 2009-04-25 12:33:55,80.5353827265,-68.1727386304,0.15,0.26,0.11,0.13,0.16,0.18,0.20 2009-04-25 12:35:18,80.6132718281,-67.8963853573,0.13,0.20,0.10,0.11,0.16,0.17,0.19 2009-04-25 12:36:40,80.6906914432,-67.6158788357,0.12,0.17,0.10,0.11,0.13,0.14,0.15 2009-04-25 12:38:01,80.768055623,-67.3300958201,0.13,0.39,0.11,0.12,0.14,0.16,0.17 2009-04-25 12:39:23,80.8453060819,-67.0400505603,0.12,0.16,0.10,0.11,0.13,0.14,0.15 2009-04-25 12:40:46,80.921963122,-66.7444524146,0.13,0.17,0.11,0.12,0.14,0.16,0.17 2009-04-25 12:42:10,80.9986626376,-66.4434704872,0.13,0.17,0.11,0.13,0.14,0.15,0.16 2009-04-25 12:43:33,81.0755809759,-66.1359715233,0.13,0.29,0.11,0.12,0.14,0.16,0.17 2009-04-25 12:44:54,81.1461847271,-65.7762990815,0.12,0.17,0.09,0.11,0.13,0.14,0.15 2009-04-25 12:46:14,81.2025086197,-65.3045516962,0.13,0.18,0.11,0.12,0.14,0.15,0.16 2009-04-25 12:47:39,81.2579562827,-64.8393325467,0.13,0.17,0.10,0.12,0.14,0.15,0.16 2009-04-25 12:49:08,81.3131488956,-64.3714841769,0.13,0.23,0.11,0.12,0.14,0.16,0.17 2009-04-25 12:50:43,81.3730323643,-63.9188451754,0.13,0.19,0.11,0.12,0.14,0.15,0.17 2009-04-25 12:52:22,81.4434909818,-63.5444028379,0.12,0.18,0.11,0.11,0.13,0.15,0.16 2009-04-25 12:53:56,81.5256271964,-63.2790930784,0.12,0.18,0.10,0.11,0.13,0.15,0.16 2009-04-25 12:55:16,81.6069045475,-63.0157043052,0.13,0.17,0.11,0.12,0.13,0.14,0.15 2009-04-25 12:56:36,81.6882331992,-62.7530747905,0.13,0.28,0.10,0.12,0.15,0.17,0.18 2009-04-25 12:57:58,81.7698227407,-62.486216293,0.12,0.16,0.10,0.11,0.13,0.14,0.15 2009-04-25 12:59:23,81.8494737826,-62.1916406461,0.12,0.18,0.10,0.11,0.13,0.15,0.16 2009-04-25 13:00:48,81.9255076934,-61.8524068521,0.12,0.28,0.10,0.11,0.12,0.14,0.15 2009-04-25 13:02:11,81.9959103707,-61.4500552018,0.12,0.17,0.10,0.11,0.13,0.14,0.16 2009-04-25 13:03:33,82.0590834794,-60.988135878,0.12,2.43,0.09,0.10,0.12,0.14,0.16 2009-04-25 13:04:52,82.1258528687,-60.5504182338,0.11,0.15,0.09,0.10,0.11,0.13,0.14 2009-04-25 13:05:56,82.1836416546,-60.1712035882,0.12,0.54,0.08,0.11,0.13,0.14,0.19 2009-04-25 13:10:25,82.406041238,-58.57830844,0.32,0.79,0.19,0.26,0.37,0.46,0.59 2009-04-25 13:11:43,82.448554792,-57.977358326,0.27,0.70,0.15,0.21,0.31,0.41,0.49 2009-04-25 13:12:57,82.491965488,-57.37621705,0.23,0.65,0.07,0.10,0.32,0.41,0.52 2009-04-25 13:14:12,82.535045475,-56.767452689,0.20,0.68,0.09,0.13,0.24,0.40,0.52 2009-04-25 13:15:26,82.577102138,-56.154751365,0.18,0.44,0.10,0.13,0.21,0.30,0.36 2009-04-25 13:16:40,82.6183521948,-55.5351566993,0.27,0.61,0.13,0.20,0.32,0.46,0.53 2009-04-25 13:17:55,82.658775949,-54.904524378,0.27,0.77,0.14,0.20,0.32,0.45,0.56 2009-04-25 13:19:09,82.698356876,-54.271717443,0.32,0.59,0.18,0.25,0.38,0.47,0.55 2009-04-25 13:20:23,82.736786389,-53.631163246,0.36,0.94,0.17,0.28,0.42,0.63,0.78 2009-04-25 13:21:37,82.775520459,-52.983012623,0.28,0.85,0.12,0.20,0.35,0.46,0.55 2009-04-25 13:22:51,82.819321908,-52.356473631,0.32,0.81,0.18,0.25,0.37,0.49,0.67 2009-04-25 13:24:05,82.864248556,-51.732106701,0.27,0.59,0.13,0.20,0.34,0.46,0.54 2009-04-25 13:25:19,82.918257257,-51.143380604,0.29,0.69,0.15,0.21,0.35,0.46,0.57 2009-04-25 13:26:33,82.969883941,-50.542293493,0.26,0.57,0.13,0.20,0.31,0.41,0.48 2009-04-25 13:27:46,83.016541592,-49.912852429,0.23,0.59,0.11,0.17,0.28,0.37,0.47 2009-04-25 13:29:00,83.0617388,-49.269048458,0.26,0.54,0.13,0.20,0.31,0.41,0.45 2009-04-25 13:30:13,83.106688641,-48.62057414,0.30,0.65,0.14,0.23,0.37,0.46,0.54 2009-04-25 13:31:27,83.151157521,-47.968105993,0.32,0.59,0.18,0.27,0.37,0.44,0.50 2009-04-25 13:32:40,83.19356204,-47.299996626,0.35,0.69,0.22,0.29,0.40,0.50,0.63 2009-04-25 13:33:54,83.23531226,-46.622739344,0.34,0.66,0.19,0.28,0.40,0.51,0.61 2009-04-25 13:35:08,83.277424976,-45.946899615,0.27,0.58,0.13,0.18,0.34,0.47,0.52 2009-04-25 13:36:22,83.3162735665,-45.252121048,0.34,0.58,0.14,0.29,0.40,0.48,0.55 2009-04-25 13:37:38,83.35446055,-44.547060882,0.34,0.74,0.19,0.28,0.40,0.49,0.56 2009-04-25 13:38:52,83.393455192,-43.845654577,0.32,0.64,0.16,0.25,0.39,0.49,0.59 2009-04-25 13:40:07,83.4303926963,-43.1318318278,0.32,0.72,0.17,0.25,0.38,0.46,0.55 2009-04-25 13:41:21,83.467224727,-42.408573211,0.31,0.66,0.17,0.25,0.36,0.46,0.53 2009-04-25 13:42:35,83.501825794,-41.67794129,0.32,0.71,0.17,0.26,0.38,0.45,0.52 2009-04-25 13:43:48,83.536047715,-40.942070435,0.28,0.94,0.11,0.17,0.36,0.48,0.69 2009-04-25 13:45:03,83.5620955075,-40.1779838843,0.19,0.93,0.10,0.12,0.22,0.39,0.61 2009-04-25 13:46:17,83.579765407,-39.390227875,0.36,0.81,0.16,0.30,0.42,0.52,0.58 2009-04-25 13:47:30,83.600306684,-38.606543515,0.40,0.84,0.24,0.32,0.47,0.59,0.69 2009-04-25 13:48:44,83.620255612,-37.8150829433,0.44,0.88,0.21,0.35,0.53,0.64,0.77 2009-04-25 13:49:58,83.640191614,-37.023330207,0.41,0.86,0.24,0.33,0.48,0.58,0.71 2009-04-25 13:51:11,83.660264236,-36.231610296,0.51,0.93,0.37,0.45,0.58,0.68,0.78 2009-04-25 13:52:25,83.6807496143,-35.4347646807,0.68,1.16,0.36,0.50,0.84,0.96,1.06 2009-04-25 13:53:30,83.7021360067,-34.7450725155,0.71,1.20,0.40,0.63,0.82,0.94,1.05 2009-04-25 16:14:33,83.359830492,-72.133536142,0.41,0.80,0.22,0.31,0.48,0.63,0.74 2009-04-25 16:15:52,83.330163674,-71.398631949,0.45,1.13,0.22,0.31,0.56,0.89,1.02 2009-04-25 16:17:12,83.3137530775,-70.6349050952,0.33,0.64,0.17,0.26,0.40,0.49,0.54 2009-04-25 16:18:32,83.300885823,-69.864423443,0.30,0.77,0.16,0.23,0.36,0.47,0.60 2009-04-25 16:19:50,83.271158796,-69.137764051,0.33,0.78,0.17,0.25,0.37,0.55,0.69 2009-04-25 16:21:09,83.241919251,-68.40906808,0.28,0.83,0.15,0.22,0.33,0.44,0.59 2009-04-25 16:22:29,83.212664808,-67.67684602,0.28,0.56,0.16,0.22,0.34,0.43,0.48 2009-04-25 16:23:46,83.167978018,-67.019505633,0.30,0.61,0.17,0.23,0.37,0.47,0.56 2009-04-25 16:25:04,83.113797151,-66.408587066,0.35,0.80,0.20,0.28,0.42,0.51,0.60 2009-04-25 16:26:22,83.065544619,-65.775251947,0.31,0.72,0.18,0.25,0.36,0.45,0.53 2009-04-25 16:27:39,83.012714361,-65.175551434,0.35,0.73,0.20,0.28,0.41,0.56,0.66 2009-04-25 16:28:55,82.9588472985,-64.5841049705,0.24,0.67,0.10,0.16,0.30,0.42,0.54 2009-04-25 16:30:12,82.902989829,-64.009289748,0.32,0.73,0.10,0.23,0.40,0.58,0.66 2009-04-25 16:31:27,82.848482019,-63.433506128,0.46,0.95,0.19,0.33,0.58,0.77,0.88 2009-04-25 16:32:43,82.7927370202,-62.8674307719,0.33,0.61,0.22,0.27,0.38,0.45,0.53 2009-04-25 16:33:59,82.7355505,-62.313333507,0.31,0.70,0.16,0.26,0.37,0.47,0.58 2009-04-25 16:35:14,82.678564818,-61.76628619,0.35,0.64,0.17,0.28,0.41,0.51,0.60 2009-04-25 16:36:29,82.620677347,-61.226972531,0.27,0.68,0.12,0.20,0.34,0.46,0.57 2009-04-25 16:37:44,82.561446089,-60.693949425,0.14,0.63,0.06,0.07,0.22,0.36,0.43 2009-04-25 16:39:00,82.50009861,-60.182391802,0.08,0.16,0.06,0.07,0.08,0.10,0.14 2009-04-25 16:39:52,82.4478659975,-59.9126556439,0.07,0.15,0.06,0.06,0.08,0.10,0.11