# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20140312.10km.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
2014-03-12 13:37:45,83.699798346,-28.418567241,0.24,0.80,0.08,0.10,0.36,0.50,0.62
2014-03-12 13:39:08,83.745651157,-27.712064223,0.30,0.69,0.14,0.22,0.36,0.54,0.63
2014-03-12 13:40:26,83.790157948,-26.993252886,0.22,0.59,0.09,0.15,0.28,0.35,0.41
2014-03-12 13:41:42,83.833948916,-26.265572104,0.25,0.77,0.12,0.18,0.31,0.45,0.56
2014-03-12 13:42:59,83.876532704,-25.526604154,0.30,0.63,0.14,0.24,0.36,0.46,0.55
2014-03-12 13:44:17,83.917263234,-24.773484743,0.24,0.55,0.11,0.16,0.30,0.41,0.48
2014-03-12 13:45:36,83.957535554,-24.013183748,0.23,0.65,0.11,0.17,0.28,0.40,0.50
2014-03-12 13:46:55,83.997020481,-23.244135259,0.20,0.60,0.09,0.12,0.26,0.38,0.52
2014-03-12 13:48:14,84.034961194,-22.463091333,0.20,0.67,0.09,0.13,0.23,0.39,0.50
2014-03-12 13:49:33,84.071954171,-21.672893386,0.18,0.56,0.09,0.13,0.21,0.30,0.41
2014-03-12 13:50:52,84.107824361,-20.873037455,0.22,0.56,0.10,0.16,0.27,0.36,0.44
2014-03-12 13:52:12,84.142480783,-20.063334746,0.18,0.62,0.07,0.11,0.23,0.36,0.46
2014-03-12 13:53:32,84.175977626,-19.244250734,0.20,0.63,0.07,0.14,0.26,0.37,0.44
2014-03-12 13:54:54,84.20860833,-18.417123265,0.21,0.70,0.10,0.14,0.26,0.38,0.57
2014-03-12 13:56:17,84.239433325,-17.578703676,0.17,0.61,0.08,0.12,0.21,0.35,0.44
2014-03-12 13:57:39,84.26917767,-16.732009194,0.14,0.41,0.07,0.10,0.17,0.24,0.28
2014-03-12 13:59:02,84.297856045,-15.877330315,0.12,0.43,0.07,0.08,0.14,0.20,0.23
2014-03-12 14:00:24,84.325301356,-15.014356971,0.12,0.29,0.07,0.09,0.15,0.21,0.25
2014-03-12 14:01:46,84.351385727,-14.143027277,0.13,0.35,0.07,0.09,0.16,0.24,0.29
2014-03-12 14:03:07,84.376242881,-13.264073737,0.14,0.38,0.06,0.09,0.17,0.25,0.32
2014-03-12 14:04:26,84.39978347,-12.377566044,0.17,0.49,0.08,0.12,0.21,0.31,0.39
2014-03-12 14:05:44,84.421861739,-11.483513856,0.14,0.54,0.07,0.10,0.16,0.26,0.39
2014-03-12 14:07:02,84.442545039,-10.582521165,0.15,0.45,0.08,0.11,0.17,0.32,0.40
2014-03-12 14:08:21,84.461872678,-9.675090302,0.15,0.49,0.07,0.10,0.18,0.30,0.37
2014-03-12 14:09:40,84.479794998,-8.761509044,0.15,0.52,0.06,0.09,0.19,0.30,0.42
2014-03-12 14:11:00,84.496286319,-7.842176846,0.16,0.52,0.08,0.11,0.19,0.28,0.38
2014-03-12 14:12:20,84.511430679,-6.917697061,0.13,0.34,0.07,0.09,0.16,0.22,0.27
2014-03-12 14:13:40,84.525156121,-5.988373488,0.14,0.43,0.07,0.10,0.17,0.24,0.30
2014-03-12 14:15:00,84.537450619,-5.054655764,0.15,0.40,0.08,0.11,0.19,0.28,0.36
2014-03-12 14:16:19,84.548280929,-4.116954529,0.17,0.47,0.08,0.12,0.20,0.29,0.39
2014-03-12 14:17:38,84.557604895,-3.175736047,0.14,0.40,0.07,0.10,0.18,0.24,0.28
2014-03-12 14:18:56,84.565489815,-2.231571472,0.18,0.46,0.07,0.14,0.22,0.28,0.36
2014-03-12 14:20:14,84.571947214,-1.284958966,0.13,0.38,0.07,0.10,0.16,0.22,0.28
2014-03-12 14:21:32,84.576893479,-0.336345786,0.13,0.36,0.05,0.09,0.17,0.24,0.28
2014-03-12 14:22:49,84.580402138,0.613738912,0.13,0.97,0.05,0.09,0.15,0.23,0.33
2014-03-12 14:24:07,84.582411033,1.564786151,0.14,0.38,0.07,0.11,0.18,0.23,0.28
2014-03-12 14:25:25,84.582884188,2.516275801,0.15,0.41,0.07,0.11,0.18,0.25,0.31
2014-03-12 14:26:42,84.581920163,3.467677432,0.10,0.35,0.05,0.07,0.13,0.20,0.26
2014-03-12 14:27:59,84.579455168,4.418465636,0.10,0.34,0.06,0.07,0.12,0.17,0.21
2014-03-12 14:29:16,84.575483389,5.368126943,0.11,0.43,0.05,0.07,0.14,0.20,0.24
2014-03-12 14:30:32,84.570073701,6.316178329,0.11,0.23,0.06,0.08,0.13,0.18,0.21
2014-03-12 14:31:48,84.563206549,7.262112872,0.10,0.26,0.06,0.07,0.12,0.18,0.22
2014-03-12 14:33:04,84.554839356,8.205374712,0.11,0.24,0.06,0.09,0.13,0.17,0.21
2014-03-12 14:34:21,84.544994721,9.145476668,0.15,0.59,0.08,0.11,0.17,0.27,0.48
2014-03-12 14:35:37,84.533705374,10.081979184,0.15,0.47,0.07,0.11,0.19,0.28,0.39
2014-03-12 14:36:54,84.521016845,11.014458915,0.13,0.29,0.07,0.10,0.15,0.21,0.26
2014-03-12 14:38:10,84.50680413,11.942244546,0.11,0.26,0.06,0.09,0.14,0.19,0.23
2014-03-12 14:39:26,84.491278232,12.865225664,0.12,0.29,0.07,0.09,0.14,0.19,0.24
2014-03-12 14:40:43,84.474238983,13.782584953,0.11,0.29,0.06,0.07,0.13,0.20,0.25
2014-03-12 14:42:00,84.455840599,14.694188454,0.09,0.28,0.05,0.06,0.10,0.14,0.21
2014-03-12 14:43:16,84.436037319,15.599511273,0.12,0.50,0.05,0.08,0.15,0.22,0.31
2014-03-12 14:44:32,84.414907765,16.498325375,0.11,0.36,0.06,0.08,0.13,0.19,0.24
2014-03-12 14:45:49,84.392396609,17.390098105,0.11,0.44,0.06,0.08,0.13,0.17,0.26
2014-03-12 14:47:05,84.368552132,18.274562579,0.13,0.33,0.06,0.08,0.17,0.24,0.28
2014-03-12 14:48:21,84.343358733,19.151317323,0.10,0.34,0.06,0.07,0.12,0.20,0.27
2014-03-12 14:49:37,84.316932128,20.020353334,0.09,0.19,0.05,0.06,0.11,0.14,0.16
2014-03-12 14:50:53,84.289120383,20.880841449,0.11,0.29,0.05,0.09,0.13,0.18,0.22
2014-03-12 14:52:09,84.260105263,21.733048124,0.11,0.25,0.07,0.08,0.13,0.17,0.22
2014-03-12 14:53:26,84.229851151,22.57655971,0.11,0.52,0.05,0.07,0.13,0.18,0.31
2014-03-12 14:54:24,84.2056635929,23.2198360038,0.11,0.22,0.05,0.07,0.14,0.19,0.21
2014-03-12 15:05:01,83.677622365,24.393312012,0.12,0.35,0.04,0.08,0.15,0.20,0.23
2014-03-12 15:06:24,83.635820773,23.6563151,0.07,0.19,0.04,0.05,0.09,0.13,0.17
2014-03-12 15:07:48,83.593823347,22.927331316,0.10,0.23,0.05,0.07,0.12,0.17,0.21
2014-03-12 15:09:10,83.550922758,22.221286836,0.10,0.60,0.05,0.06,0.12,0.17,0.21
2014-03-12 15:10:29,83.507092861,21.525511813,0.08,0.30,0.04,0.06,0.09,0.13,0.18
2014-03-12 15:11:45,83.462367118,20.838918258,0.10,0.35,0.05,0.06,0.12,0.17,0.26
2014-03-12 15:13:01,83.416707798,20.161796082,0.12,0.60,0.06,0.08,0.14,0.23,0.27
2014-03-12 15:14:16,83.369969508,19.495017689,0.13,0.37,0.06,0.08,0.16,0.28,0.35
2014-03-12 15:15:32,83.32249636,18.836835734,0.09,0.20,0.05,0.07,0.10,0.14,0.17
2014-03-12 15:16:48,83.274184072,18.187864315,0.08,0.23,0.05,0.06,0.10,0.14,0.18
2014-03-12 15:18:04,83.225025239,17.548210703,0.08,0.20,0.05,0.06,0.09,0.13,0.16
2014-03-12 15:19:20,83.175017736,16.917945063,0.11,0.27,0.06,0.08,0.13,0.17,0.22
2014-03-12 15:20:37,83.124212388,16.296834665,0.09,0.22,0.05,0.07,0.11,0.15,0.18
2014-03-12 15:21:53,83.072603526,15.684941632,0.12,0.32,0.06,0.08,0.14,0.22,0.28
2014-03-12 15:23:10,83.020275397,15.081811513,0.11,0.28,0.06,0.08,0.13,0.20,0.25
2014-03-12 15:24:27,82.967179343,14.487761566,0.10,0.28,0.05,0.07,0.12,0.18,0.24
2014-03-12 15:25:44,82.913290257,13.902976228,0.10,0.31,0.06,0.07,0.13,0.19,0.23
2014-03-12 15:27:02,82.858700715,13.326917204,0.10,0.19,0.07,0.08,0.11,0.13,0.15
2014-03-12 15:28:20,82.803413038,12.759565335,0.12,0.23,0.08,0.10,0.14,0.17,0.19
2014-03-12 15:29:38,82.747474618,12.200634176,0.11,0.26,0.07,0.09,0.13,0.17,0.19
2014-03-12 15:30:56,82.690842772,11.650401783,0.11,0.28,0.07,0.09,0.12,0.16,0.20
2014-03-12 15:32:14,82.6335338837,11.1087691226,0.13,0.29,0.08,0.10,0.15,0.20,0.25
2014-03-12 15:33:33,82.575569697,10.575600398,0.15,0.47,0.09,0.12,0.18,0.22,0.36
2014-03-12 15:34:51,82.516985057,10.050646433,0.12,0.30,0.07,0.10,0.13,0.19,0.23
2014-03-12 15:36:10,82.457819735,9.5336321,0.13,0.31,0.09,0.11,0.15,0.20,0.23
2014-03-12 15:37:29,82.3980195157,9.02491454894,0.13,0.30,0.07,0.10,0.15,0.20,0.25
2014-03-12 15:38:48,82.3376923531,8.52375061111,0.12,0.31,0.07,0.09,0.13,0.20,0.24
2014-03-12 15:40:08,82.276752945,8.030698335,0.13,0.28,0.09,0.11,0.15,0.19,0.22
2014-03-12 15:41:28,82.21529672,7.545064901,0.15,0.22,0.10,0.13,0.17,0.19,0.21
2014-03-12 15:42:47,82.15326466,7.067259146,0.15,0.23,0.11,0.13,0.17,0.19,0.21
2014-03-12 15:44:07,82.090678004,6.597105954,0.15,0.29,0.10,0.12,0.17,0.21,0.26
2014-03-12 15:45:27,82.027633524,6.133893298,0.15,0.24,0.10,0.12,0.16,0.20,0.22
2014-03-12 15:46:46,81.964076674,5.677990037,0.15,0.27,0.10,0.12,0.17,0.20,0.24
2014-03-12 15:48:06,81.899991096,5.229470883,0.12,0.24,0.06,0.10,0.15,0.19,0.21
2014-03-12 15:49:26,81.835420952,4.787970196,0.15,0.26,0.09,0.12,0.17,0.21,0.24
2014-03-12 15:50:45,81.770384779,4.353346094,0.13,0.22,0.07,0.11,0.16,0.18,0.20
2014-03-12 15:52:05,81.704888534,3.92551978,0.12,0.25,0.07,0.10,0.15,0.19,0.22
2014-03-12 15:53:24,81.638882947,3.50483573,0.12,0.23,0.07,0.10,0.15,0.18,0.20
2014-03-12 15:54:44,81.572508036,3.090189503,0.13,0.26,0.08,0.10,0.16,0.19,0.22
2014-03-12 15:56:03,81.50573284,2.68177216,0.13,0.22,0.08,0.11,0.15,0.19,0.20
2014-03-12 15:57:22,81.438502741,2.27997451,0.13,0.21,0.08,0.10,0.15,0.18,0.19
2014-03-12 15:58:38,81.3725996245,1.89482583966,0.16,0.28,0.11,0.14,0.18,0.22,0.25
2014-03-12 16:08:58,81.2027497665,-2.42014542175,0.15,0.34,0.07,0.11,0.19,0.26,0.31
2014-03-12 16:10:16,81.2413944,-2.958047786,0.14,0.38,0.07,0.11,0.16,0.23,0.29
2014-03-12 16:11:33,81.277594829,-3.503890349,0.10,0.26,0.05,0.07,0.12,0.16,0.20
2014-03-12 16:12:51,81.312940255,-4.054113031,0.12,0.29,0.07,0.09,0.14,0.21,0.25
2014-03-12 16:14:08,81.347298895,-4.605824871,0.12,0.33,0.05,0.08,0.15,0.23,0.29
2014-03-12 16:15:25,81.380813642,-5.160887236,0.18,0.44,0.08,0.12,0.22,0.32,0.38
2014-03-12 16:16:43,81.413402481,-5.720512466,0.14,0.38,0.07,0.09,0.17,0.24,0.29
2014-03-12 16:18:00,81.44529853,-6.284013938,0.16,0.50,0.05,0.08,0.22,0.32,0.40
2014-03-12 16:19:17,81.476300947,-6.851820791,0.14,0.45,0.05,0.10,0.18,0.27,0.33
2014-03-12 16:20:35,81.506556579,-7.423497371,0.15,0.38,0.06,0.08,0.20,0.29,0.35
2014-03-12 16:21:52,81.535881063,-7.999384194,0.12,0.36,0.05,0.08,0.15,0.25,0.29
2014-03-12 16:23:10,81.564251956,-8.579423169,0.11,0.47,0.05,0.07,0.14,0.22,0.32
2014-03-12 16:24:27,81.59203192,-9.16270716,0.13,0.48,0.05,0.08,0.16,0.25,0.32
2014-03-12 16:25:44,81.618739531,-9.750203077,0.12,0.28,0.06,0.09,0.14,0.20,0.24
2014-03-12 16:27:02,81.644689622,-10.341126857,0.15,0.39,0.08,0.11,0.17,0.26,0.33
2014-03-12 16:28:19,81.669737905,-10.935693987,0.14,0.41,0.05,0.09,0.19,0.26,0.33
2014-03-12 16:29:37,81.693923692,-11.533705234,0.16,0.43,0.05,0.11,0.20,0.30,0.37
2014-03-12 16:30:29,81.7095484255,-11.9328155137,0.26,0.66,0.10,0.20,0.32,0.45,0.53