# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20170411.10km.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
2017-04-11 12:32:20,81.907611306,-93.954563966,0.26,0.62,0.10,0.18,0.32,0.44,0.54
2017-04-11 12:33:47,81.959741526,-94.475918214,0.20,0.78,0.10,0.13,0.25,0.35,0.44
2017-04-11 12:35:15,82.011204921,-95.003996,0.25,0.84,0.10,0.17,0.31,0.44,0.54
2017-04-11 12:36:35,82.061972467,-95.53892085,0.21,0.74,0.11,0.15,0.25,0.37,0.55
2017-04-11 12:37:55,82.112004477,-96.080879089,0.18,0.72,0.08,0.11,0.23,0.36,0.50
2017-04-11 12:39:16,82.161432706,-96.629166259,0.24,0.79,0.09,0.14,0.31,0.46,0.60
2017-04-11 12:40:36,82.210066029,-97.184681476,0.17,0.53,0.04,0.12,0.21,0.30,0.40
2017-04-11 12:41:57,82.257969701,-97.747084316,0.15,0.46,0.09,0.11,0.17,0.25,0.35
2017-04-11 12:43:17,82.305183708,-98.31611851,0.19,0.53,0.09,0.11,0.25,0.35,0.43
2017-04-11 12:44:37,82.351609201,-98.892212999,0.19,0.68,0.10,0.13,0.22,0.31,0.47
2017-04-11 12:45:57,82.397245623,-99.47530733,0.17,0.56,0.08,0.11,0.21,0.32,0.48
2017-04-11 12:47:17,82.44207733,-100.065413552,0.17,0.42,0.07,0.11,0.21,0.30,0.34
2017-04-11 12:48:37,82.486140959,-100.66232414,0.16,0.51,0.08,0.11,0.20,0.28,0.35
2017-04-11 12:49:58,82.529396162,-101.266130078,0.17,0.47,0.07,0.11,0.22,0.34,0.43
2017-04-11 12:51:18,82.571804881,-101.876941044,0.21,0.50,0.09,0.16,0.26,0.34,0.41
2017-04-11 12:52:38,82.613342209,-102.494762055,0.15,0.51,0.05,0.11,0.19,0.26,0.35
2017-04-11 12:53:58,82.654065271,-103.119275131,0.16,0.45,0.07,0.11,0.20,0.27,0.38
2017-04-11 12:55:17,82.693883303,-103.750762681,0.12,0.52,0.05,0.07,0.16,0.26,0.36
2017-04-11 12:56:37,82.732815485,-104.389055994,0.13,0.53,0.06,0.09,0.16,0.25,0.40
2017-04-11 12:57:56,82.770887528,-105.033951316,0.16,0.36,0.07,0.10,0.20,0.28,0.32
2017-04-11 12:59:16,82.807998566,-105.685714128,0.17,0.44,0.08,0.12,0.21,0.31,0.35
2017-04-11 13:00:37,82.844197602,-106.344050413,0.15,0.51,0.07,0.10,0.19,0.28,0.36
2017-04-11 13:01:56,82.879462902,-107.00893054,0.18,0.37,0.09,0.13,0.22,0.29,0.32
2017-04-11 13:03:15,82.913771312,-107.680313901,0.15,0.56,0.07,0.09,0.16,0.33,0.49
2017-04-11 13:04:34,82.947072971,-108.358232176,0.18,0.36,0.10,0.14,0.21,0.27,0.32
2017-04-11 13:05:53,82.979425109,-109.04227386,0.17,0.55,0.08,0.11,0.22,0.31,0.40
2017-04-11 13:07:12,83.010738105,-109.732678399,0.16,0.44,0.07,0.11,0.20,0.29,0.38
2017-04-11 13:08:32,83.041024444,-110.429223105,0.15,0.44,0.04,0.10,0.19,0.29,0.35
2017-04-11 13:09:51,83.070350172,-111.131450549,0.19,0.45,0.11,0.14,0.22,0.29,0.39
2017-04-11 13:11:11,83.098620783,-111.839586459,0.17,0.34,0.10,0.14,0.20,0.25,0.28
2017-04-11 13:12:31,83.125839102,-112.553451264,0.18,0.66,0.10,0.14,0.21,0.31,0.38
2017-04-11 13:13:52,83.151970475,-113.272897456,0.16,0.43,0.08,0.13,0.19,0.25,0.31
2017-04-11 13:15:13,83.177056682,-113.997638723,0.15,0.43,0.06,0.10,0.18,0.27,0.34
2017-04-11 13:16:33,83.200976606,-114.727788645,0.11,0.29,0.04,0.07,0.15,0.20,0.23
2017-04-11 13:17:54,83.223869084,-115.462776644,0.16,0.47,0.08,0.11,0.19,0.27,0.38
2017-04-11 13:19:14,83.245625926,-116.202638943,0.15,0.31,0.09,0.11,0.18,0.25,0.29
2017-04-11 13:20:31,83.266237566,-116.947168706,0.17,0.55,0.08,0.12,0.20,0.26,0.40
2017-04-11 13:21:48,83.285803254,-117.695967487,0.15,0.53,0.07,0.11,0.18,0.25,0.35
2017-04-11 13:23:05,83.304125945,-118.449185776,0.14,0.38,0.07,0.10,0.17,0.24,0.31
2017-04-11 13:24:21,83.321303339,-119.206381299,0.15,0.41,0.09,0.12,0.18,0.25,0.33
2017-04-11 13:25:38,83.337410381,-119.967183236,0.14,0.32,0.07,0.11,0.17,0.23,0.29
2017-04-11 13:26:55,83.352250172,-120.731674092,0.14,0.46,0.07,0.10,0.16,0.25,0.33
2017-04-11 13:28:11,83.365929131,-121.499386906,0.11,0.34,0.06,0.08,0.13,0.20,0.28
2017-04-11 13:29:29,83.378452223,-122.270134005,0.13,0.38,0.06,0.09,0.15,0.24,0.31
2017-04-11 13:30:46,83.389808425,-123.043592054,0.12,0.33,0.07,0.09,0.14,0.19,0.25
2017-04-11 13:32:03,83.399875427,-123.819637276,0.11,0.28,0.06,0.09,0.13,0.18,0.22
2017-04-11 13:33:19,83.408841466,-124.597822491,0.12,0.39,0.07,0.09,0.14,0.21,0.28
2017-04-11 13:34:36,83.416571237,-125.377983857,0.14,0.37,0.08,0.10,0.16,0.23,0.27
2017-04-11 13:35:53,83.423042661,-126.159819551,0.14,0.54,0.06,0.09,0.16,0.26,0.43
2017-04-11 13:37:11,83.428291836,-126.9431101,0.12,0.61,0.06,0.09,0.14,0.20,0.27
2017-04-11 13:38:29,83.432367757,-127.727466442,0.12,0.43,0.06,0.08,0.14,0.23,0.29
2017-04-11 13:39:47,83.435205255,-128.512567558,0.10,0.56,0.03,0.06,0.12,0.21,0.27
2017-04-11 13:41:06,83.436808702,-129.298240262,0.13,0.48,0.06,0.09,0.15,0.22,0.27
2017-04-11 13:42:25,83.437221889,-130.084171082,0.12,0.38,0.07,0.09,0.14,0.21,0.27
2017-04-11 13:43:44,83.436363796,-130.870057937,0.11,0.33,0.06,0.08,0.14,0.22,0.27
2017-04-11 13:45:03,83.434361316,-131.655629341,0.11,0.29,0.06,0.08,0.12,0.19,0.25
2017-04-11 13:46:24,83.431045521,-132.440543646,0.10,0.34,0.06,0.07,0.12,0.17,0.26
2017-04-11 13:47:44,83.426589781,-133.224565722,0.15,0.72,0.06,0.09,0.17,0.43,0.65
2017-04-11 13:49:05,83.420869121,-134.007358051,0.11,0.27,0.06,0.08,0.13,0.18,0.21
2017-04-11 13:50:26,83.413883417,-134.788610936,0.12,0.35,0.06,0.09,0.13,0.20,0.25
2017-04-11 13:51:47,83.405784666,-135.568152112,0.13,0.43,0.06,0.08,0.16,0.24,0.35
2017-04-11 13:53:08,83.396431758,-136.345610931,0.12,0.31,0.06,0.09,0.14,0.20,0.26
2017-04-11 13:54:29,83.38586825,-137.120738119,0.10,0.27,0.05,0.07,0.12,0.18,0.22
2017-04-11 13:55:50,83.374129095,-137.89329021,0.12,0.42,0.06,0.08,0.15,0.23,0.29
2017-04-11 13:57:11,83.361218701,-138.6629978,0.12,0.39,0.06,0.09,0.14,0.22,0.31
2017-04-11 13:58:32,83.347113733,-139.429559543,0.11,0.29,0.06,0.08,0.14,0.20,0.25
2017-04-11 13:59:51,83.33173369,-140.192639085,0.11,0.32,0.06,0.08,0.13,0.18,0.24
2017-04-11 14:01:10,83.315336852,-140.952310604,0.10,0.24,0.06,0.08,0.12,0.17,0.22
2017-04-11 14:02:27,83.297722751,-141.708038644,0.10,0.33,0.05,0.08,0.11,0.16,0.22
2017-04-11 14:03:45,83.27896522,-142.459737096,0.12,0.36,0.06,0.08,0.14,0.21,0.29
2017-04-11 14:05:04,83.259059522,-143.206592258,0.11,0.28,0.05,0.08,0.13,0.18,0.22
2017-04-11 14:06:23,83.237997467,-143.949940189,0.13,0.39,0.06,0.09,0.15,0.23,0.31
2017-04-11 14:07:17,83.2230139783,-144.455959883,0.14,0.33,0.08,0.11,0.16,0.22,0.29
2017-04-11 14:12:31,83.386199731,-146.101580307,0.12,0.34,0.07,0.09,0.14,0.20,0.27
2017-04-11 14:13:53,83.475923074,-146.146038879,0.11,0.35,0.07,0.08,0.13,0.19,0.24
2017-04-11 14:15:15,83.565615058,-146.190459804,0.12,0.35,0.07,0.09,0.15,0.21,0.26
2017-04-11 14:16:37,83.655304398,-146.235850922,0.12,0.42,0.06,0.09,0.15,0.23,0.30
2017-04-11 14:17:59,83.744989302,-146.2827171,0.15,0.49,0.07,0.10,0.18,0.27,0.34
2017-04-11 14:19:21,83.834669316,-146.33095979,0.14,0.35,0.08,0.10,0.17,0.24,0.29
2017-04-11 14:20:42,83.924345063,-146.380483494,0.12,0.40,0.07,0.09,0.14,0.21,0.31
2017-04-11 14:22:03,84.014016084,-146.431533586,0.12,0.38,0.07,0.09,0.14,0.20,0.28
2017-04-11 14:23:25,84.103681805,-146.484178872,0.10,0.29,0.06,0.08,0.12,0.18,0.23
2017-04-11 14:24:28,84.1733584124,-146.526310858,0.12,0.36,0.06,0.08,0.14,0.26,0.32
2017-04-11 14:26:47,84.3254763927,-146.624461911,0.07,0.16,0.03,0.05,0.08,0.14,0.15
2017-04-11 14:27:30,84.37264533,-146.65222863,0.13,0.36,0.07,0.09,0.16,0.23,0.29
2017-04-11 14:28:52,84.462285532,-146.711875701,0.13,0.34,0.07,0.10,0.15,0.21,0.27
2017-04-11 14:30:15,84.551923655,-146.773428999,0.11,0.32,0.07,0.09,0.13,0.17,0.25
2017-04-11 14:31:38,84.641556618,-146.836833925,0.13,0.44,0.06,0.10,0.16,0.24,0.31
2017-04-11 14:33:01,84.731179589,-146.902790601,0.13,0.45,0.07,0.09,0.16,0.22,0.29
2017-04-11 14:34:14,84.8090140655,-146.961931128,0.16,0.48,0.07,0.11,0.19,0.25,0.34
2017-04-11 14:35:51,84.9170119132,-147.046219813,0.11,0.67,0.06,0.08,0.13,0.20,0.26
2017-04-11 14:37:39,85.038003422,-147.144183477,0.11,0.22,0.07,0.09,0.14,0.17,0.21
2017-04-11 14:38:25,85.089605636,-147.19016754,0.13,0.30,0.08,0.10,0.15,0.20,0.26
2017-04-11 14:39:43,85.17919212,-147.268268712,0.15,0.40,0.07,0.11,0.18,0.30,0.37
2017-04-11 14:41:02,85.268768563,-147.349552559,0.15,0.43,0.07,0.11,0.18,0.24,0.30
2017-04-11 14:42:16,85.3524552467,-147.428234376,0.13,0.46,0.06,0.09,0.15,0.21,0.29
2017-04-11 14:50:33,85.9148557862,-148.042267621,0.13,0.29,0.08,0.11,0.15,0.19,0.25
2017-04-11 14:51:38,85.98496381,-148.130569746,0.14,0.51,0.07,0.10,0.16,0.24,0.35
2017-04-11 14:53:01,86.074425639,-148.248376659,0.12,0.28,0.07,0.09,0.13,0.18,0.23
2017-04-11 14:54:24,86.163868295,-148.371812403,0.13,0.38,0.08,0.09,0.15,0.21,0.28
2017-04-11 14:55:47,86.253297178,-148.500414739,0.13,0.36,0.08,0.10,0.15,0.22,0.31
2017-04-11 14:57:10,86.342701499,-148.636030119,0.12,0.32,0.08,0.10,0.15,0.21,0.24
2017-04-11 14:58:33,86.432085847,-148.778274224,0.14,0.41,0.07,0.10,0.16,0.24,0.29
2017-04-11 14:59:56,86.521450295,-148.927341412,0.12,0.28,0.08,0.09,0.14,0.20,0.24
2017-04-11 15:01:19,86.610787138,-149.08450974,0.12,0.38,0.07,0.09,0.14,0.21,0.27
2017-04-11 15:02:42,86.70009608,-149.250329636,0.13,0.44,0.07,0.09,0.15,0.28,0.36
2017-04-11 15:04:05,86.789377675,-149.425248714,0.15,0.51,0.08,0.10,0.17,0.30,0.44
2017-04-11 15:05:28,86.878630058,-149.610084252,0.12,0.30,0.08,0.09,0.14,0.19,0.23
2017-04-11 15:06:51,86.967842072,-149.806166123,0.13,0.47,0.08,0.10,0.14,0.18,0.27
2017-04-11 15:07:41,87.0214090199,-149.927059632,0.14,0.24,0.09,0.11,0.15,0.21,0.24
2017-04-11 15:12:30,87.3328379406,-150.743952079,0.12,0.32,0.07,0.09,0.13,0.21,0.26
2017-04-11 15:13:44,87.413274915,-150.987634009,0.14,0.37,0.08,0.11,0.17,0.24,0.28
2017-04-11 15:15:07,87.502205922,-151.273857437,0.12,0.44,0.04,0.07,0.15,0.21,0.30
2017-04-11 15:16:31,87.591063485,-151.582060706,0.12,0.29,0.07,0.09,0.14,0.20,0.23
2017-04-11 15:17:54,87.679846649,-151.913673854,0.11,0.28,0.05,0.08,0.14,0.19,0.22
2017-04-11 15:19:16,87.7674831568,-152.267050804,0.15,0.38,0.08,0.11,0.18,0.24,0.32
2017-04-11 15:24:52,87.964487058,-146.276925491,0.13,0.36,0.08,0.10,0.15,0.22,0.29
2017-04-11 15:26:08,87.976461391,-143.763190052,0.14,0.56,0.07,0.10,0.16,0.28,0.36
2017-04-11 15:27:23,87.98450894,-141.224251164,0.16,0.63,0.08,0.11,0.19,0.35,0.47
2017-04-11 15:28:38,87.988554167,-138.670009919,0.15,0.38,0.08,0.11,0.18,0.24,0.30
2017-04-11 15:29:53,87.988728607,-136.110721147,0.14,0.45,0.07,0.10,0.16,0.25,0.35
2017-04-11 15:31:07,87.984780745,-133.556036087,0.13,0.35,0.07,0.10,0.15,0.20,0.26
2017-04-11 15:32:22,87.976989178,-131.016105101,0.14,0.32,0.08,0.11,0.16,0.22,0.26
2017-04-11 15:33:36,87.965222682,-128.500642302,0.13,0.43,0.07,0.10,0.15,0.23,0.30
2017-04-11 15:34:51,87.949609667,-126.018592567,0.13,0.33,0.07,0.09,0.16,0.22,0.28
2017-04-11 15:36:06,87.930279331,-123.578040592,0.13,0.27,0.07,0.09,0.16,0.21,0.25
2017-04-11 15:37:20,87.907218153,-121.187221153,0.13,0.32,0.07,0.10,0.15,0.20,0.24
2017-04-11 15:38:35,87.880696454,-118.85174662,0.14,0.32,0.09,0.11,0.16,0.22,0.28
2017-04-11 15:39:49,87.850647502,-116.578502747,0.11,0.34,0.06,0.08,0.14,0.19,0.24
2017-04-11 15:41:03,87.817339048,-114.371065762,0.11,0.33,0.04,0.05,0.15,0.21,0.25
2017-04-11 15:42:18,87.780973931,-112.232084286,0.11,0.28,0.06,0.08,0.14,0.19,0.23
2017-04-11 15:43:32,87.741714771,-110.163573087,0.14,0.40,0.08,0.10,0.16,0.26,0.33
2017-04-11 15:44:46,87.699534442,-108.169247259,0.16,0.36,0.07,0.12,0.21,0.28,0.32
2017-04-11 15:46:00,87.6546667,-106.248957157,0.16,0.37,0.08,0.11,0.21,0.26,0.31
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2017-04-11 16:35:05,84.80425047,-69.701813021,0.25,0.64,0.13,0.18,0.30,0.42,0.52
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2017-04-11 16:44:44,84.136815543,-66.931267696,0.36,1.05,0.15,0.22,0.45,0.69,0.88
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2017-04-11 16:48:20,83.883616612,-66.046733908,0.28,0.73,0.13,0.18,0.35,0.50,0.64
2017-04-11 16:49:32,83.798948806,-65.766949795,0.27,0.58,0.14,0.20,0.33,0.43,0.51
2017-04-11 16:50:44,83.714137669,-65.494681439,0.30,1.08,0.07,0.16,0.39,0.64,0.83
2017-04-11 16:51:56,83.629166571,-65.230225687,0.28,0.91,0.11,0.16,0.34,0.62,0.73
2017-04-11 16:53:07,83.544097085,-64.971847061,0.30,1.29,0.11,0.17,0.38,0.67,0.95
2017-04-11 16:54:19,83.458890165,-64.720463164,0.27,0.96,0.13,0.17,0.33,0.57,0.74
2017-04-11 16:55:31,83.373597225,-64.474599107,0.23,0.64,0.12,0.16,0.27,0.40,0.50
2017-04-11 16:56:42,83.28818142,-64.235065602,0.19,0.56,0.08,0.13,0.24,0.34,0.44
2017-04-11 16:57:54,83.202646061,-64.001684809,0.19,0.71,0.11,0.15,0.22,0.32,0.51
2017-04-11 16:59:06,83.116998115,-63.774137785,0.19,0.53,0.09,0.14,0.22,0.31,0.39
2017-04-11 17:00:18,83.031250696,-63.552019258,0.19,0.66,0.04,0.10,0.27,0.40,0.52
2017-04-11 17:01:31,82.945442082,-63.334265973,0.24,0.74,0.13,0.18,0.28,0.39,0.53
2017-04-11 17:02:44,82.859525512,-63.12192505,0.26,0.65,0.13,0.19,0.33,0.45,0.54
2017-04-11 17:03:23,82.8136717121,-63.0113557273,0.17,0.52,0.04,0.06,0.22,0.33,0.50