# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20150327.10km.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
2015-03-27 19:48:30,71.4190300694,-137.686750236,0.28,0.71,0.12,0.19,0.35,0.47,0.60
2015-03-27 19:50:09,71.522582074,-137.583143206,0.14,0.50,0.06,0.09,0.17,0.31,0.38
2015-03-27 19:51:32,71.608115586,-137.496324988,0.11,0.31,0.06,0.08,0.12,0.19,0.25
2015-03-27 19:52:54,71.693630062,-137.408932055,0.14,0.39,0.06,0.10,0.18,0.26,0.31
2015-03-27 19:54:16,71.779118771,-137.32089192,0.13,0.39,0.06,0.08,0.16,0.23,0.31
2015-03-27 19:55:39,71.8655896876,-137.230607999,0.18,0.69,0.06,0.08,0.23,0.37,0.49
2015-03-27 20:00:44,72.183115875,-136.890085665,0.17,0.59,0.07,0.11,0.20,0.37,0.51
2015-03-27 20:03:43,72.3754712893,-136.681051111,0.13,0.46,0.05,0.07,0.17,0.25,0.34
2015-03-27 20:05:51,72.5090961054,-136.531649222,0.13,0.35,0.06,0.09,0.15,0.21,0.26
2015-03-27 20:07:17,72.594279239,-136.43543662,0.12,0.46,0.06,0.08,0.13,0.22,0.31
2015-03-27 20:08:43,72.679279558,-136.338092848,0.16,0.64,0.08,0.11,0.19,0.25,0.32
2015-03-27 20:10:08,72.764225935,-136.239836667,0.16,0.52,0.06,0.10,0.19,0.30,0.36
2015-03-27 20:11:33,72.849142144,-136.140688545,0.15,0.41,0.08,0.10,0.19,0.27,0.32
2015-03-27 20:12:58,72.933999141,-136.040484982,0.17,0.47,0.07,0.10,0.22,0.31,0.40
2015-03-27 20:14:23,73.0188296872,-135.939539834,0.10,0.39,0.04,0.06,0.13,0.22,0.30
2015-03-27 20:15:47,73.103601972,-135.837536867,0.13,0.30,0.07,0.09,0.15,0.20,0.24
2015-03-27 20:17:11,73.188317963,-135.734488606,0.16,0.38,0.06,0.11,0.19,0.28,0.32
2015-03-27 20:18:35,73.272983512,-135.630434479,0.15,0.43,0.07,0.11,0.19,0.27,0.33
2015-03-27 20:19:59,73.357593775,-135.525314753,0.16,0.74,0.09,0.11,0.19,0.25,0.31
2015-03-27 20:21:23,73.442155414,-135.419201525,0.17,0.37,0.08,0.12,0.21,0.28,0.33
2015-03-27 20:22:47,73.526644107,-135.311850676,0.16,0.40,0.06,0.11,0.19,0.27,0.32
2015-03-27 20:24:11,73.611106737,-135.203712017,0.16,0.45,0.09,0.12,0.19,0.28,0.36
2015-03-27 20:25:34,73.695495978,-135.094317763,0.09,0.43,0.05,0.05,0.11,0.23,0.35
2015-03-27 20:26:57,73.779825021,-134.983792184,0.16,0.42,0.06,0.13,0.19,0.26,0.32
2015-03-27 20:28:20,73.864074839,-134.871925409,0.13,0.48,0.07,0.09,0.16,0.22,0.30
2015-03-27 20:29:44,73.948303479,-134.759271707,0.13,0.32,0.07,0.09,0.16,0.22,0.27
2015-03-27 20:31:07,74.032489948,-134.64563149,0.14,0.42,0.05,0.08,0.18,0.27,0.36
2015-03-27 20:32:31,74.116583573,-134.530504362,0.10,0.29,0.05,0.05,0.12,0.21,0.26
2015-03-27 20:33:55,74.200625877,-134.414286974,0.16,0.52,0.05,0.12,0.20,0.28,0.38
2015-03-27 20:35:18,74.284576864,-134.296584995,0.14,0.50,0.05,0.09,0.17,0.25,0.35
2015-03-27 20:36:41,74.368496631,-134.177966416,0.16,0.47,0.07,0.11,0.19,0.29,0.36
2015-03-27 20:38:03,74.452351472,-134.058079336,0.15,0.38,0.08,0.10,0.19,0.25,0.33
2015-03-27 20:39:26,74.536127926,-133.936800063,0.16,0.76,0.05,0.10,0.19,0.36,0.57
2015-03-27 20:40:48,74.619894612,-133.814784541,0.15,0.42,0.07,0.11,0.17,0.25,0.36
2015-03-27 20:42:10,74.703520852,-133.690761398,0.15,0.38,0.09,0.12,0.18,0.24,0.30
2015-03-27 20:43:33,74.787107338,-133.56569464,0.18,0.45,0.09,0.13,0.22,0.29,0.38
2015-03-27 20:44:55,74.870603858,-133.439092196,0.09,0.34,0.05,0.05,0.12,0.19,0.24
2015-03-27 20:46:17,74.9540585556,-133.311403321,0.10,0.51,0.05,0.06,0.12,0.20,0.26
2015-03-27 20:47:39,75.037408372,-133.181988883,0.15,0.45,0.08,0.10,0.18,0.29,0.36
2015-03-27 20:49:00,75.120710596,-133.051411546,0.15,0.34,0.06,0.11,0.18,0.25,0.30
2015-03-27 20:52:17,75.3220565178,-132.728446683,0.22,0.52,0.09,0.18,0.25,0.32,0.43
2015-03-27 20:54:02,75.430142616,-132.552132465,0.15,0.68,0.08,0.10,0.18,0.27,0.36
2015-03-27 20:55:22,75.513080073,-132.414558479,0.14,0.43,0.08,0.11,0.17,0.22,0.28
2015-03-27 20:56:42,75.595917589,-132.27525555,0.15,0.58,0.08,0.10,0.18,0.26,0.36
2015-03-27 20:58:01,75.678688521,-132.134532058,0.18,0.55,0.09,0.11,0.21,0.38,0.46
2015-03-27 20:59:22,75.761391175,-131.99236087,0.15,0.52,0.08,0.11,0.17,0.26,0.36
2015-03-27 21:00:42,75.844009212,-131.848574066,0.20,0.74,0.05,0.13,0.26,0.39,0.49
2015-03-27 21:02:01,75.926494446,-131.702669457,0.24,0.71,0.10,0.15,0.31,0.46,0.59
2015-03-27 21:03:21,76.008890046,-131.555075145,0.25,0.62,0.10,0.17,0.32,0.44,0.51
2015-03-27 21:04:43,76.091215035,-131.405957499,0.21,0.54,0.11,0.16,0.25,0.35,0.42
2015-03-27 21:06:05,76.173484624,-131.255446764,0.26,0.78,0.13,0.18,0.31,0.44,0.52
2015-03-27 21:07:28,76.255636149,-131.102935304,0.17,0.45,0.06,0.12,0.21,0.30,0.36
2015-03-27 21:08:51,76.33763079,-130.948044494,0.17,0.73,0.06,0.13,0.20,0.28,0.35
2015-03-27 21:10:14,76.4195661469,-130.791688529,0.17,0.46,0.05,0.11,0.23,0.32,0.37
2015-03-27 21:11:37,76.501479462,-130.634181898,0.19,0.50,0.08,0.13,0.24,0.33,0.40
2015-03-27 21:12:59,76.583257975,-130.474444761,0.18,0.63,0.08,0.13,0.22,0.34,0.42
2015-03-27 21:14:22,76.664879318,-130.312264793,0.22,0.51,0.11,0.17,0.27,0.35,0.44
2015-03-27 21:15:44,76.746560883,-130.14804572,0.21,0.56,0.06,0.16,0.26,0.36,0.46
2015-03-27 21:17:07,76.828517416,-129.981223422,0.21,0.65,0.10,0.15,0.24,0.37,0.51
2015-03-27 21:18:30,76.909870518,-129.81353809,0.17,0.53,0.09,0.12,0.20,0.28,0.36
2015-03-27 21:19:52,76.991065048,-129.643343342,0.16,0.49,0.09,0.11,0.18,0.29,0.36
2015-03-27 21:21:15,77.072179545,-129.47133212,0.20,0.49,0.11,0.15,0.24,0.32,0.38
2015-03-27 21:22:48,77.1623876652,-129.276728027,0.16,0.44,0.05,0.10,0.21,0.29,0.37
2015-03-27 21:26:56,77.4013890188,-128.748551854,0.20,0.61,0.10,0.15,0.24,0.31,0.40
2015-03-27 21:28:19,77.481898369,-128.565281592,0.17,0.48,0.09,0.12,0.21,0.29,0.39
2015-03-27 21:29:44,77.562275062,-128.379614359,0.30,0.93,0.13,0.22,0.35,0.52,0.81
2015-03-27 21:31:08,77.642524364,-128.191582146,0.24,0.76,0.12,0.18,0.29,0.41,0.53
2015-03-27 21:32:32,77.722667173,-128.001358333,0.22,0.67,0.09,0.14,0.27,0.38,0.54
2015-03-27 21:33:58,77.8034600229,-127.806311283,0.21,0.53,0.06,0.16,0.26,0.37,0.42
2015-03-27 21:35:23,77.884106872,-127.608957303,0.27,0.74,0.16,0.22,0.31,0.40,0.49
2015-03-27 21:36:48,77.964303037,-127.409909379,0.22,0.53,0.11,0.17,0.26,0.34,0.41
2015-03-27 21:38:14,78.044490307,-127.207981481,0.20,0.45,0.11,0.16,0.24,0.33,0.41
2015-03-27 21:39:39,78.124536398,-127.003404749,0.23,0.50,0.10,0.15,0.29,0.42,0.48
2015-03-27 21:41:04,78.204426381,-126.796048236,0.30,0.68,0.14,0.22,0.37,0.49,0.58
2015-03-27 21:41:50,78.2470609437,-126.683373183,0.21,0.39,0.13,0.17,0.23,0.36,0.38
2015-03-27 21:46:40,78.196923489,-125.936871648,0.26,0.64,0.11,0.18,0.32,0.45,0.53
2015-03-27 21:47:58,78.107079864,-125.919399701,0.21,0.74,0.10,0.14,0.25,0.39,0.49
2015-03-27 21:49:17,78.01723977,-125.901908852,0.20,0.80,0.10,0.14,0.24,0.39,0.56
2015-03-27 21:50:35,77.927404541,-125.884371222,0.33,1.30,0.13,0.22,0.41,0.66,0.88
2015-03-27 21:51:53,77.837565155,-125.867279854,0.21,0.58,0.10,0.15,0.26,0.40,0.49
2015-03-27 21:53:13,77.747718111,-125.850731302,0.21,1.11,0.11,0.15,0.25,0.37,0.73
2015-03-27 21:54:35,77.657889799,-125.8338368,0.24,0.74,0.13,0.17,0.30,0.42,0.53
2015-03-27 21:55:56,77.568126254,-125.817557429,0.36,0.89,0.14,0.24,0.45,0.69,0.79
2015-03-27 21:57:18,77.47836214,-125.801487546,0.21,0.70,0.10,0.14,0.25,0.39,0.50
2015-03-27 21:58:40,77.388600864,-125.785206321,0.21,0.73,0.11,0.15,0.24,0.35,0.49
2015-03-27 22:00:01,77.298833951,-125.769778338,0.23,0.92,0.11,0.16,0.27,0.40,0.59
2015-03-27 22:01:23,77.20906766,-125.754432488,0.23,0.75,0.10,0.16,0.28,0.44,0.57
2015-03-27 22:02:45,77.1192620227,-125.738953452,0.26,0.88,0.07,0.17,0.32,0.52,0.68
2015-03-27 22:04:08,77.028814435,-125.724169868,0.18,0.49,0.09,0.12,0.22,0.32,0.39
2015-03-27 22:05:30,76.939046915,-125.709123325,0.25,0.64,0.12,0.18,0.30,0.44,0.54
2015-03-27 22:06:52,76.849276551,-125.694544493,0.20,0.47,0.08,0.14,0.24,0.35,0.39
2015-03-27 22:08:15,76.759395812,-125.680224838,0.25,0.80,0.08,0.16,0.31,0.45,0.58
2015-03-27 22:09:38,76.669468567,-125.665517077,0.24,0.62,0.11,0.16,0.30,0.45,0.55
2015-03-27 22:11:01,76.5797014579,-125.650980132,0.22,0.90,0.05,0.14,0.28,0.40,0.49
2015-03-27 22:12:24,76.4899284304,-125.63730899,0.23,0.72,0.08,0.14,0.29,0.45,0.55
2015-03-27 22:13:47,76.400154343,-125.623616114,0.26,0.79,0.10,0.16,0.35,0.47,0.58
2015-03-27 22:15:10,76.310379221,-125.61013979,0.21,0.67,0.09,0.14,0.26,0.39,0.48
2015-03-27 22:16:33,76.220606853,-125.59645149,0.22,0.55,0.10,0.16,0.26,0.37,0.46
2015-03-27 22:17:56,76.130832112,-125.583177331,0.19,0.48,0.09,0.12,0.25,0.35,0.41
2015-03-27 22:19:19,76.041054738,-125.570349178,0.18,0.72,0.08,0.13,0.22,0.31,0.47
2015-03-27 22:20:43,75.951279282,-125.557457586,0.31,0.68,0.14,0.22,0.39,0.54,0.61
2015-03-27 22:22:06,75.861502051,-125.544762573,0.28,0.68,0.10,0.20,0.34,0.49,0.61
2015-03-27 22:23:30,75.771722988,-125.532239554,0.31,0.77,0.13,0.21,0.38,0.58,0.65
2015-03-27 22:24:54,75.681940875,-125.520177531,0.21,0.74,0.05,0.14,0.28,0.40,0.53
2015-03-27 22:26:18,75.5921621346,-125.507828586,0.06,0.38,0.04,0.05,0.06,0.09,0.30
2015-03-27 22:27:42,75.5023833937,-125.495582581,0.05,0.09,0.05,0.05,0.06,0.06,0.07
2015-03-27 22:29:07,75.412604294,-125.483524426,0.06,0.09,0.05,0.05,0.06,0.07,0.08
2015-03-27 22:30:31,75.32282433,-125.471717016,0.24,0.68,0.05,0.07,0.37,0.53,0.61
2015-03-27 22:31:56,75.233040078,-125.460307984,0.27,0.58,0.13,0.20,0.33,0.46,0.54
2015-03-27 22:33:20,75.143257646,-125.448699002,0.27,0.78,0.13,0.20,0.32,0.47,0.64
2015-03-27 22:34:45,75.053476663,-125.437012927,0.33,0.82,0.14,0.25,0.40,0.52,0.66
2015-03-27 22:36:10,74.963694827,-125.425521685,0.44,1.02,0.22,0.33,0.52,0.72,0.86
2015-03-27 22:37:35,74.873910405,-125.414469771,0.41,0.94,0.19,0.30,0.49,0.66,0.82
2015-03-27 22:38:59,74.784125713,-125.403562273,0.32,0.69,0.15,0.24,0.40,0.52,0.60
2015-03-27 22:40:25,74.694332388,-125.392564089,0.35,0.83,0.16,0.27,0.42,0.54,0.65
2015-03-27 22:41:50,74.604440059,-125.381701403,0.30,0.74,0.11,0.22,0.38,0.49,0.57
2015-03-27 22:43:17,74.514536998,-125.37145364,0.29,0.70,0.14,0.21,0.36,0.50,0.60
2015-03-27 22:44:43,74.424631641,-125.360928024,0.36,0.89,0.15,0.25,0.45,0.59,0.73
2015-03-27 22:46:10,74.3346421657,-125.350135069,0.34,0.82,0.07,0.18,0.48,0.63,0.76
2015-03-27 22:47:46,74.234786105,-125.378431458,0.06,0.12,0.05,0.06,0.06,0.08,0.10
2015-03-27 22:49:12,74.145235086,-125.428739091,0.05,0.06,0.05,0.05,0.06,0.06,0.06
2015-03-27 22:50:37,74.056215322,-125.477744687,0.06,0.06,0.05,0.05,0.06,0.06,0.06
2015-03-27 22:52:02,73.967360219,-125.525698986,0.05,0.06,0.05,0.05,0.06,0.06,0.06
2015-03-27 22:53:27,73.878516212,-125.5736567,0.05,0.06,0.04,0.05,0.05,0.06,0.06
2015-03-27 22:54:51,73.789658608,-125.62102478,0.05,0.08,0.04,0.05,0.05,0.06,0.06
2015-03-27 22:56:16,73.700778892,-125.667592408,0.05,0.07,0.04,0.04,0.05,0.06,0.06
2015-03-27 22:57:40,73.611894232,-125.713783963,0.10,0.44,0.04,0.04,0.13,0.25,0.34
2015-03-27 22:59:05,73.523004879,-125.759596954,0.12,0.64,0.06,0.07,0.15,0.25,0.35
2015-03-27 23:00:31,73.434092161,-125.804658697,0.19,0.52,0.09,0.14,0.22,0.29,0.35
2015-03-27 23:01:57,73.345182281,-125.84955413,0.17,0.67,0.07,0.11,0.20,0.34,0.47
2015-03-27 23:03:23,73.256288389,-125.894604825,0.12,0.38,0.06,0.07,0.15,0.24,0.30
2015-03-27 23:04:49,73.167347019,-125.938262318,0.12,0.51,0.06,0.07,0.16,0.23,0.31
2015-03-27 23:06:15,73.078372824,-125.980883894,0.14,0.42,0.05,0.10,0.18,0.25,0.33
2015-03-27 23:07:41,72.98938963,-126.023057469,0.05,0.20,0.04,0.05,0.05,0.06,0.13
2015-03-27 23:09:08,72.900447436,-126.066054209,0.05,0.10,0.05,0.05,0.06,0.07,0.09
2015-03-27 23:10:35,72.8112699995,-126.108528436,0.06,0.12,0.05,0.06,0.06,0.07,0.08
2015-03-27 23:12:11,72.7132051768,-126.154954966,0.06,0.23,0.02,0.05,0.08,0.12,0.15
2015-03-27 23:14:12,72.5903689593,-126.211438796,0.06,0.21,0.02,0.05,0.08,0.12,0.16
2015-03-27 23:16:12,72.47000348,-126.265376403,0.22,0.95,0.05,0.07,0.31,0.60,0.84
2015-03-27 23:17:41,72.3809766136,-126.305052464,0.06,0.08,0.05,0.05,0.06,0.06,0.07
2015-03-27 23:19:37,72.2650552263,-126.357384957,0.06,0.18,0.02,0.04,0.08,0.10,0.13
2015-03-27 23:21:19,72.1616590948,-126.402855567,0.06,0.11,0.03,0.05,0.07,0.09,0.10