# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20150325.10km.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
2015-03-25 12:31:33,83.151790742,-80.336184088,0.41,1.10,0.26,0.33,0.46,0.65,0.83
2015-03-25 12:32:54,83.223657512,-80.790569895,0.35,0.72,0.16,0.28,0.42,0.54,0.66
2015-03-25 12:34:15,83.295078909,-81.254780508,0.31,0.97,0.13,0.22,0.38,0.52,0.68
2015-03-25 12:35:35,83.366148779,-81.727868129,0.32,1.00,0.17,0.24,0.37,0.52,0.67
2015-03-25 12:36:55,83.436575235,-82.213155224,0.37,0.83,0.23,0.31,0.43,0.54,0.67
2015-03-25 12:38:15,83.506570022,-82.708389456,0.32,0.71,0.15,0.25,0.39,0.51,0.61
2015-03-25 12:39:36,83.576125586,-83.213754581,0.32,0.95,0.15,0.23,0.39,0.51,0.65
2015-03-25 12:40:57,83.645126915,-83.730627204,0.34,0.86,0.18,0.26,0.39,0.54,0.70
2015-03-25 12:42:19,83.713661966,-84.258152451,0.31,0.82,0.16,0.22,0.38,0.53,0.66
2015-03-25 12:43:42,83.781633949,-84.797452899,0.27,0.73,0.12,0.19,0.33,0.49,0.65
2015-03-25 12:45:04,83.849069385,-85.348340692,0.28,0.75,0.14,0.20,0.34,0.49,0.59
2015-03-25 12:46:26,83.915937636,-85.911238325,0.30,0.86,0.13,0.22,0.37,0.51,0.66
2015-03-25 12:47:48,83.982136207,-86.487298081,0.26,0.82,0.13,0.18,0.31,0.51,0.70
2015-03-25 12:49:10,84.047743056,-87.075796526,0.24,0.73,0.13,0.19,0.28,0.40,0.54
2015-03-25 12:50:32,84.112728664,-87.677163747,0.22,0.64,0.12,0.16,0.26,0.35,0.47
2015-03-25 12:51:54,84.177082898,-88.291568363,0.25,0.67,0.13,0.17,0.31,0.43,0.53
2015-03-25 12:53:15,84.240715272,-88.920001869,0.22,0.65,0.11,0.15,0.26,0.42,0.54
2015-03-25 12:54:38,84.303629716,-89.562485397,0.25,0.70,0.13,0.19,0.31,0.44,0.52
2015-03-25 12:56:00,84.365828771,-90.219068498,0.21,0.59,0.09,0.13,0.25,0.42,0.51
2015-03-25 12:57:22,84.427337197,-90.88958285,0.17,0.58,0.09,0.11,0.19,0.31,0.44
2015-03-25 12:58:44,84.488049683,-91.575109154,0.19,0.54,0.08,0.13,0.23,0.35,0.45
2015-03-25 13:00:06,84.547909496,-92.276257752,0.21,0.61,0.10,0.14,0.25,0.38,0.51
2015-03-25 13:01:28,84.606965213,-92.992587089,0.25,0.74,0.12,0.18,0.30,0.44,0.60
2015-03-25 13:02:50,84.665152836,-93.724715228,0.24,0.65,0.11,0.18,0.29,0.39,0.48
2015-03-25 13:04:12,84.722498917,-94.472426847,0.18,0.59,0.09,0.12,0.22,0.35,0.45
2015-03-25 13:05:35,84.778928449,-95.236411281,0.25,0.64,0.13,0.19,0.29,0.44,0.52
2015-03-25 13:06:57,84.834330523,-96.0176156,0.23,0.71,0.13,0.17,0.27,0.36,0.47
2015-03-25 13:08:19,84.8888231809,-96.8150054523,0.21,0.58,0.09,0.14,0.26,0.38,0.45
2015-03-25 13:09:42,84.94224763,-97.629914325,0.29,0.80,0.17,0.22,0.33,0.45,0.53
2015-03-25 13:11:05,84.9947356028,-98.4611665122,0.17,0.54,0.08,0.12,0.20,0.31,0.39
2015-03-25 13:12:28,85.046059619,-99.310553809,0.23,0.68,0.10,0.15,0.28,0.41,0.52
2015-03-25 13:13:52,85.096358906,-100.176848577,0.22,0.61,0.11,0.16,0.26,0.37,0.46
2015-03-25 13:15:14,85.145473753,-101.061193527,0.24,0.54,0.13,0.18,0.29,0.39,0.49
2015-03-25 13:16:37,85.193448902,-101.963087352,0.20,0.76,0.10,0.14,0.25,0.34,0.60
2015-03-25 13:18:00,85.24015113,-102.883357372,0.22,0.64,0.12,0.16,0.26,0.38,0.53
2015-03-25 13:19:23,85.285673539,-103.821130892,0.22,0.85,0.10,0.15,0.26,0.38,0.51
2015-03-25 13:20:46,85.329905164,-104.776951888,0.22,0.64,0.11,0.15,0.26,0.38,0.51
2015-03-25 13:22:09,85.372776784,-105.750999172,0.19,0.68,0.09,0.13,0.24,0.35,0.46
2015-03-25 13:23:33,85.414327437,-106.742708745,0.15,0.42,0.09,0.11,0.19,0.26,0.31
2015-03-25 13:24:57,85.454403595,-107.752700576,0.18,0.56,0.09,0.12,0.23,0.35,0.46
2015-03-25 13:26:21,85.493158838,-108.77964054,0.24,0.56,0.09,0.17,0.29,0.40,0.46
2015-03-25 13:27:45,85.530357208,-109.824556876,0.26,0.53,0.14,0.20,0.30,0.39,0.48
2015-03-25 13:29:10,85.566038029,-110.886682562,0.24,0.61,0.10,0.15,0.31,0.42,0.46
2015-03-25 13:30:34,85.600231773,-111.965338299,0.19,0.67,0.09,0.13,0.24,0.36,0.53
2015-03-25 13:31:58,85.632888151,-113.060266068,0.23,0.66,0.12,0.18,0.27,0.37,0.43
2015-03-25 13:33:21,85.663893443,-114.171419823,0.22,0.56,0.11,0.17,0.26,0.33,0.45
2015-03-25 13:34:44,85.693322171,-115.297797372,0.22,0.62,0.12,0.17,0.26,0.35,0.47
2015-03-25 13:36:08,85.721018366,-116.439423342,0.21,0.62,0.12,0.16,0.24,0.32,0.45
2015-03-25 13:37:32,85.747019337,-117.595369204,0.20,0.49,0.12,0.16,0.23,0.32,0.40
2015-03-25 13:38:57,85.771276905,-118.765022643,0.19,0.46,0.11,0.14,0.22,0.31,0.40
2015-03-25 13:40:22,85.79375005,-119.94767622,0.17,0.52,0.10,0.13,0.20,0.28,0.36
2015-03-25 13:41:47,85.814386417,-121.142590402,0.21,0.55,0.11,0.16,0.26,0.35,0.44
2015-03-25 13:43:12,85.833216931,-122.348720656,0.19,0.72,0.10,0.14,0.21,0.33,0.55
2015-03-25 13:44:37,85.850190432,-123.565226088,0.17,0.38,0.10,0.13,0.20,0.29,0.34
2015-03-25 13:46:01,85.86526292,-124.791222049,0.21,0.56,0.11,0.15,0.25,0.35,0.45
2015-03-25 13:47:25,85.878430456,-126.02562116,0.21,0.51,0.13,0.17,0.25,0.33,0.42
2015-03-25 13:48:48,85.889732302,-127.267251261,0.21,0.55,0.11,0.15,0.25,0.36,0.47
2015-03-25 13:50:12,85.899008029,-128.515249038,0.22,0.53,0.11,0.16,0.26,0.38,0.45
2015-03-25 13:51:36,85.90641931,-129.76821487,0.26,0.58,0.14,0.20,0.30,0.40,0.48
2015-03-25 13:53:00,85.911959345,-131.025043116,0.28,0.80,0.16,0.21,0.34,0.46,0.55
2015-03-25 13:54:24,85.915412897,-132.284710716,0.21,0.67,0.10,0.15,0.25,0.37,0.49
2015-03-25 13:55:48,85.916907564,-133.54592212,0.18,0.48,0.10,0.13,0.21,0.32,0.45
2015-03-25 13:57:13,85.916341214,-134.807427209,0.23,0.60,0.10,0.17,0.28,0.40,0.51
2015-03-25 13:58:37,85.913881301,-136.068019023,0.28,0.78,0.17,0.22,0.32,0.47,0.64
2015-03-25 14:00:02,85.909426265,-137.326469772,0.27,0.87,0.16,0.22,0.32,0.40,0.52
2015-03-25 14:01:26,85.903078416,-138.581652002,0.24,0.57,0.09,0.15,0.32,0.47,0.53
2015-03-25 14:02:50,85.894685852,-139.832224602,0.24,0.75,0.12,0.16,0.29,0.43,0.51
2015-03-25 14:04:15,85.884356917,-141.077126137,0.25,0.61,0.13,0.19,0.30,0.42,0.50
2015-03-25 14:05:39,85.872109203,-142.315267604,0.22,0.73,0.10,0.16,0.27,0.39,0.54
2015-03-25 14:07:04,85.858102357,-143.545878134,0.21,0.69,0.11,0.15,0.24,0.37,0.48
2015-03-25 14:08:29,85.842118399,-144.767414037,0.18,0.65,0.09,0.12,0.21,0.32,0.40
2015-03-25 14:09:54,85.824235891,-145.978983632,0.21,0.59,0.11,0.15,0.25,0.34,0.45
2015-03-25 14:11:19,85.804460371,-147.179535491,0.23,0.78,0.12,0.16,0.27,0.39,0.49
2015-03-25 14:12:24,85.7883460699,-148.081624893,0.19,0.44,0.10,0.13,0.24,0.32,0.38
2015-03-25 14:18:03,86.024887466,-149.998383478,0.25,1.06,0.11,0.15,0.28,0.65,0.88
2015-03-25 14:19:28,86.117195504,-149.995601956,0.18,0.41,0.09,0.12,0.22,0.32,0.37
2015-03-25 14:20:53,86.209400585,-149.99930702,0.18,0.41,0.09,0.13,0.22,0.29,0.36
2015-03-25 14:22:18,86.301120844,-149.999551112,0.22,0.76,0.10,0.15,0.26,0.41,0.67
2015-03-25 14:23:42,86.391067851,-149.999039702,0.20,0.62,0.09,0.14,0.23,0.34,0.44
2015-03-25 14:25:05,86.480899247,-149.999679466,0.18,0.52,0.10,0.13,0.21,0.30,0.36
2015-03-25 14:26:29,86.570730305,-149.999208458,0.18,0.53,0.10,0.13,0.21,0.29,0.37
2015-03-25 14:31:06,86.868461843,-149.999460959,0.18,0.55,0.10,0.13,0.21,0.31,0.40
2015-03-25 14:32:57,86.987993471,-149.999912606,0.15,0.72,0.08,0.11,0.18,0.26,0.42
2015-03-25 14:34:19,87.077824814,-149.998864209,0.17,0.45,0.09,0.12,0.20,0.31,0.37
2015-03-25 14:35:42,87.167655875,-149.998495987,0.17,0.63,0.09,0.11,0.21,0.31,0.47
2015-03-25 14:37:05,87.257486639,-149.99957678,0.18,0.78,0.08,0.13,0.22,0.33,0.47
2015-03-25 14:38:27,87.347316851,-150.001927982,0.21,0.78,0.10,0.13,0.26,0.47,0.62
2015-03-25 14:39:50,87.437146175,-150.00159547,0.21,0.50,0.11,0.16,0.25,0.34,0.40
2015-03-25 14:41:13,87.526976264,-149.999747432,0.18,0.44,0.10,0.13,0.22,0.31,0.38
2015-03-25 14:42:35,87.616807729,-149.999848596,0.21,0.50,0.10,0.15,0.25,0.33,0.39
2015-03-25 14:43:57,87.706638936,-150.000074483,0.19,0.42,0.10,0.14,0.23,0.31,0.36
2015-03-25 14:45:20,87.796469945,-150.000388176,0.19,0.50,0.10,0.14,0.23,0.31,0.40
2015-03-25 14:46:42,87.886300449,-150.000153046,0.20,0.51,0.09,0.14,0.24,0.34,0.46
2015-03-25 14:48:04,87.976130527,-150.000189445,0.17,0.46,0.09,0.12,0.20,0.31,0.39
2015-03-25 14:49:26,88.06595995,-149.996995117,0.15,0.54,0.08,0.10,0.17,0.25,0.34
2015-03-25 14:50:51,88.1590293804,-149.997537531,0.17,0.49,0.08,0.12,0.20,0.30,0.42
2015-03-25 14:52:15,88.250653473,-149.997711271,0.17,0.48,0.09,0.13,0.21,0.29,0.37
2015-03-25 14:53:37,88.340484482,-149.999421999,0.18,0.57,0.10,0.13,0.22,0.30,0.39
2015-03-25 14:54:59,88.430315416,-149.997788545,0.16,0.55,0.08,0.12,0.19,0.26,0.33
2015-03-25 14:56:21,88.520145769,-149.999271905,0.15,0.45,0.08,0.11,0.19,0.27,0.34
2015-03-25 14:57:43,88.609975682,-149.999188043,0.17,0.51,0.08,0.12,0.20,0.31,0.41
2015-03-25 14:59:05,88.699805255,-149.998185051,0.18,0.43,0.09,0.14,0.22,0.31,0.37
2015-03-25 15:00:27,88.789636828,-149.999742216,0.21,0.89,0.09,0.13,0.26,0.42,0.68
2015-03-25 15:01:49,88.879468285,-149.99840786,0.13,0.33,0.08,0.09,0.15,0.24,0.29
2015-03-25 15:03:10,88.969299423,-149.996695273,0.13,0.39,0.07,0.09,0.15,0.24,0.32
2015-03-25 15:04:32,89.05913027,-149.997028228,0.15,0.40,0.07,0.10,0.17,0.27,0.33
2015-03-25 15:05:54,89.148960654,-150.000200551,0.15,0.43,0.08,0.10,0.18,0.29,0.36
2015-03-25 15:07:15,89.238790485,-149.997987222,0.16,0.50,0.09,0.11,0.18,0.30,0.40
2015-03-25 15:08:36,89.328619179,-150.000345355,0.14,1.15,0.07,0.09,0.15,0.27,0.41
2015-03-25 15:09:57,89.418450334,-149.996818705,0.14,0.55,0.08,0.10,0.16,0.27,0.37
2015-03-25 15:11:18,89.508281604,-150.001228574,0.13,0.38,0.07,0.09,0.16,0.25,0.32
2015-03-25 15:12:38,89.598112585,-150.000586584,0.16,0.39,0.08,0.11,0.20,0.28,0.34
2015-03-25 15:13:58,89.687943208,-150.018350048,0.20,0.67,0.09,0.12,0.24,0.40,0.53
2015-03-25 15:15:17,89.777773203,-150.008587125,0.15,0.44,0.07,0.10,0.18,0.26,0.34
2015-03-25 15:16:35,89.8665689335,-150.033201914,0.16,0.61,0.08,0.11,0.19,0.29,0.42