# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20110316.10km.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
2011-03-16 12:47:09,81.392115275,-97.370319501,0.25,0.54,0.12,0.20,0.31,0.41,0.47
2011-03-16 12:48:28,81.378094395,-97.962655781,0.20,0.70,0.09,0.13,0.24,0.36,0.49
2011-03-16 12:49:49,81.361372896,-98.550882136,0.24,0.64,0.11,0.17,0.29,0.40,0.50
2011-03-16 12:51:13,81.344543281,-99.137766396,0.20,0.54,0.06,0.14,0.25,0.34,0.40
2011-03-16 12:52:38,81.325468076,-99.720445397,0.22,0.58,0.09,0.15,0.27,0.36,0.42
2011-03-16 12:54:02,81.307149858,-100.302983034,0.20,0.53,0.10,0.15,0.24,0.32,0.41
2011-03-16 12:55:25,81.287689887,-100.882599605,0.20,0.50,0.10,0.15,0.23,0.33,0.42
2011-03-16 12:56:47,81.266570011,-101.45832475,0.26,0.55,0.15,0.21,0.30,0.40,0.48
2011-03-16 12:58:10,81.244988663,-102.031899684,0.22,0.64,0.12,0.17,0.26,0.35,0.46
2011-03-16 12:59:32,81.222752361,-102.602996288,0.21,0.72,0.09,0.14,0.25,0.39,0.49
2011-03-16 13:00:55,81.199411618,-103.170728403,0.22,0.60,0.10,0.15,0.27,0.40,0.54
2011-03-16 13:02:17,81.175204073,-103.735382083,0.24,0.60,0.12,0.17,0.28,0.39,0.50
2011-03-16 13:03:40,81.150176454,-104.296958229,0.19,0.59,0.08,0.13,0.24,0.35,0.46
2011-03-16 13:05:02,81.124327984,-104.85536964,0.21,0.56,0.09,0.15,0.26,0.37,0.45
2011-03-16 13:06:23,81.097618409,-105.410432699,0.19,0.50,0.08,0.13,0.23,0.33,0.42
2011-03-16 13:07:44,81.070221077,-105.962420134,0.20,0.78,0.08,0.13,0.24,0.34,0.47
2011-03-16 13:09:06,81.042173318,-106.511352309,0.20,0.49,0.10,0.15,0.25,0.32,0.38
2011-03-16 13:10:27,81.013349327,-107.056891337,0.22,0.59,0.09,0.16,0.28,0.39,0.49
2011-03-16 13:11:44,80.983950561,-107.599428151,0.18,0.58,0.09,0.12,0.21,0.31,0.41
2011-03-16 13:13:02,80.953083986,-108.136862208,0.19,0.73,0.07,0.11,0.23,0.39,0.56
2011-03-16 13:14:20,80.921573742,-108.670935841,0.21,0.56,0.09,0.13,0.27,0.41,0.47
2011-03-16 13:15:39,80.889610164,-109.202067987,0.24,0.61,0.08,0.17,0.30,0.39,0.50
2011-03-16 13:16:59,80.856730873,-109.729089147,0.18,0.50,0.08,0.12,0.23,0.30,0.40
2011-03-16 13:18:18,80.823255836,-110.252749661,0.22,0.62,0.11,0.16,0.26,0.37,0.46
2011-03-16 13:19:38,80.788952909,-110.772378057,0.21,0.57,0.10,0.15,0.25,0.36,0.47
2011-03-16 13:20:58,80.753949085,-111.288246378,0.18,0.46,0.09,0.14,0.22,0.29,0.34
2011-03-16 13:22:18,80.718237377,-111.800273496,0.17,0.50,0.09,0.13,0.20,0.29,0.36
2011-03-16 13:23:37,80.681839177,-112.308409656,0.21,0.57,0.08,0.15,0.26,0.37,0.47
2011-03-16 13:24:57,80.644707176,-112.812606444,0.20,0.53,0.10,0.14,0.25,0.35,0.43
2011-03-16 13:26:16,80.606992732,-113.313164384,0.21,0.47,0.09,0.15,0.26,0.36,0.42
2011-03-16 13:27:36,80.568387697,-113.809154463,0.16,0.98,0.07,0.11,0.19,0.27,0.44
2011-03-16 13:28:55,80.529099029,-114.301112059,0.19,0.45,0.11,0.14,0.23,0.30,0.39
2011-03-16 13:30:14,80.48968122,-114.790673842,0.19,0.52,0.08,0.14,0.23,0.33,0.40
2011-03-16 13:31:33,80.449145252,-115.274845908,0.17,0.51,0.09,0.13,0.21,0.29,0.35
2011-03-16 13:32:52,80.408028215,-115.75518532,0.17,0.66,0.09,0.11,0.20,0.32,0.41
2011-03-16 13:34:10,80.366119673,-116.230997215,0.16,0.59,0.06,0.09,0.21,0.32,0.42
2011-03-16 13:35:29,80.323741753,-116.703268777,0.16,0.64,0.07,0.11,0.19,0.30,0.43
2011-03-16 13:36:47,80.2809266187,-117.172103363,0.18,0.44,0.08,0.11,0.23,0.33,0.41
2011-03-16 13:38:05,80.237296574,-117.636220528,0.18,0.47,0.08,0.12,0.23,0.33,0.40
2011-03-16 13:39:23,80.193155605,-118.096596157,0.20,0.56,0.09,0.13,0.25,0.37,0.45
2011-03-16 13:40:41,80.148106086,-118.551853392,0.17,0.54,0.07,0.11,0.21,0.32,0.42
2011-03-16 13:41:59,80.103050819,-119.004999947,0.18,0.53,0.09,0.14,0.22,0.29,0.35
2011-03-16 13:43:18,80.056905213,-119.452293409,0.18,0.58,0.07,0.10,0.23,0.37,0.46
2011-03-16 13:44:35,80.011018441,-119.898541106,0.20,0.66,0.08,0.13,0.24,0.34,0.42
2011-03-16 13:45:53,79.963650715,-120.337557145,0.20,0.71,0.09,0.13,0.26,0.37,0.48
2011-03-16 13:47:11,79.915612155,-120.772123768,0.17,0.64,0.08,0.12,0.20,0.31,0.47
2011-03-16 13:48:29,79.867753893,-121.205268349,0.23,0.93,0.10,0.15,0.28,0.41,0.53
2011-03-16 13:49:46,79.818667214,-121.631925672,0.18,0.60,0.07,0.13,0.22,0.33,0.47
2011-03-16 13:51:03,79.769590215,-122.056579804,0.21,0.76,0.08,0.13,0.27,0.40,0.56
2011-03-16 13:52:21,79.719545654,-122.475598139,0.19,0.64,0.09,0.14,0.22,0.36,0.50
2011-03-16 13:53:39,79.669080309,-122.891007493,0.20,0.67,0.07,0.10,0.27,0.43,0.57
2011-03-16 13:54:59,79.618223264,-123.302919528,0.19,0.68,0.08,0.12,0.25,0.35,0.59
2011-03-16 13:56:21,79.566955622,-123.71126523,0.19,0.59,0.09,0.14,0.22,0.33,0.40
2011-03-16 13:57:43,79.514959514,-124.11479955,0.17,0.68,0.09,0.12,0.21,0.32,0.47
2011-03-16 13:59:03,79.462565767,-124.514792176,0.19,0.48,0.10,0.14,0.22,0.32,0.38
2011-03-16 14:00:22,79.409509419,-124.910191331,0.22,0.68,0.09,0.15,0.28,0.41,0.52
2011-03-16 14:01:39,79.356259162,-125.302853816,0.16,0.61,0.08,0.11,0.19,0.32,0.46
2011-03-16 14:02:55,79.302557029,-125.691765334,0.16,0.53,0.08,0.10,0.19,0.32,0.45
2011-03-16 14:04:11,79.248632482,-126.077862374,0.21,0.64,0.09,0.15,0.25,0.36,0.48
2011-03-16 14:05:27,79.193970938,-126.459044413,0.23,0.68,0.10,0.17,0.28,0.40,0.53
2011-03-16 14:06:43,79.138623666,-126.835486547,0.17,0.62,0.08,0.12,0.20,0.30,0.41
2011-03-16 14:07:59,79.083048705,-127.209087415,0.15,0.58,0.08,0.10,0.17,0.26,0.33
2011-03-16 14:09:16,79.02704188,-127.579013855,0.16,0.42,0.08,0.11,0.19,0.28,0.34
2011-03-16 14:10:32,78.970458386,-127.944634854,0.17,0.42,0.09,0.12,0.20,0.28,0.36
2011-03-16 14:11:48,78.913379582,-128.30629075,0.15,0.39,0.08,0.11,0.19,0.26,0.33
2011-03-16 14:13:04,78.856319448,-128.666191921,0.15,0.54,0.08,0.10,0.19,0.28,0.36
2011-03-16 14:14:20,78.798514706,-129.021069003,0.18,0.70,0.10,0.12,0.22,0.33,0.47
2011-03-16 14:15:36,78.740647156,-129.373887257,0.15,0.41,0.08,0.11,0.18,0.26,0.35
2011-03-16 14:16:52,78.682157759,-129.722194379,0.17,0.50,0.07,0.12,0.21,0.30,0.43
2011-03-16 14:18:08,78.622926868,-130.065460958,0.14,0.35,0.08,0.10,0.17,0.25,0.30
2011-03-16 14:19:23,78.564045255,-130.408507216,0.16,0.51,0.09,0.11,0.19,0.29,0.36
2011-03-16 14:20:39,78.504362412,-130.746255976,0.16,0.89,0.07,0.10,0.19,0.31,0.48
2011-03-16 14:21:54,78.444134181,-131.079835276,0.18,0.57,0.09,0.12,0.21,0.33,0.45
2011-03-16 14:23:09,78.383991904,-131.412090466,0.16,0.54,0.06,0.10,0.20,0.28,0.39
2011-03-16 14:24:25,78.323215948,-131.739782784,0.15,0.46,0.07,0.11,0.18,0.25,0.34
2011-03-16 14:25:39,78.262377041,-132.065513825,0.16,0.41,0.07,0.11,0.18,0.31,0.36
2011-03-16 14:26:54,78.200859314,-132.38646962,0.17,0.43,0.08,0.12,0.20,0.30,0.41
2011-03-16 14:28:08,78.138881518,-132.703656374,0.15,0.41,0.08,0.11,0.19,0.27,0.31
2011-03-16 14:29:23,78.07698014,-133.019574156,0.21,0.54,0.11,0.15,0.25,0.37,0.44
2011-03-16 14:30:37,78.014338203,-133.330427548,0.16,0.43,0.07,0.12,0.20,0.27,0.34
2011-03-16 14:31:51,77.951204813,-133.637363882,0.15,0.38,0.08,0.11,0.18,0.26,0.31
2011-03-16 14:33:06,77.888513405,-133.9448085,0.16,0.57,0.07,0.12,0.19,0.28,0.36
2011-03-16 14:34:21,77.825233473,-134.24791873,0.15,0.41,0.08,0.11,0.17,0.26,0.35
2011-03-16 14:35:37,77.761403085,-134.546868653,0.17,0.49,0.09,0.11,0.21,0.31,0.38
2011-03-16 14:36:53,77.697573724,-134.844295747,0.14,0.56,0.08,0.10,0.16,0.24,0.35
2011-03-16 14:38:09,77.632895377,-135.136127517,0.15,0.48,0.08,0.10,0.17,0.25,0.37
2011-03-16 14:39:25,77.56840323,-135.42735578,0.14,0.35,0.08,0.11,0.16,0.24,0.29
2011-03-16 14:40:42,77.502797069,-135.711668198,0.13,0.54,0.08,0.10,0.16,0.23,0.32
2011-03-16 14:41:58,77.438419957,-136.00047875,0.13,0.36,0.07,0.10,0.16,0.24,0.31
2011-03-16 14:43:14,77.372652972,-136.281131358,0.12,0.39,0.07,0.08,0.14,0.22,0.28
2011-03-16 14:44:31,77.30686212,-136.560212576,0.13,0.28,0.08,0.10,0.16,0.22,0.26
2011-03-16 14:45:47,77.240715737,-136.836128209,0.16,0.46,0.09,0.12,0.19,0.26,0.34
2011-03-16 14:47:04,77.174381915,-137.109707958,0.15,0.40,0.09,0.12,0.18,0.25,0.31
2011-03-16 14:48:21,77.107750443,-137.380433758,0.16,0.41,0.09,0.12,0.19,0.29,0.38
2011-03-16 14:49:38,77.040903399,-137.648710488,0.14,0.38,0.07,0.10,0.17,0.25,0.30
2011-03-16 14:50:55,76.973845052,-137.914576046,0.15,0.46,0.08,0.11,0.19,0.26,0.36
2011-03-16 14:52:11,76.906156664,-138.175938094,0.13,0.41,0.07,0.10,0.15,0.22,0.27
2011-03-16 14:53:28,76.83874727,-138.437360879,0.16,0.34,0.08,0.12,0.19,0.26,0.31
2011-03-16 14:54:46,76.771024104,-138.695906736,0.14,0.35,0.08,0.10,0.17,0.22,0.25
2011-03-16 14:56:03,76.702881419,-138.951047255,0.16,0.54,0.09,0.12,0.19,0.28,0.34
2011-03-16 14:57:20,76.634491416,-139.203648739,0.16,0.39,0.08,0.11,0.19,0.27,0.32
2011-03-16 14:58:37,76.565979109,-139.454363946,0.12,0.31,0.08,0.10,0.14,0.19,0.24
2011-03-16 14:59:54,76.49699509,-139.701391773,0.14,0.36,0.07,0.11,0.17,0.26,0.31
2011-03-16 15:01:11,76.428051533,-139.947402008,0.14,0.36,0.08,0.11,0.16,0.23,0.27
2011-03-16 15:02:28,76.35868964,-140.190054068,0.14,0.33,0.09,0.11,0.17,0.23,0.28
2011-03-16 15:03:46,76.28926116,-140.431152009,0.13,0.58,0.05,0.09,0.17,0.23,0.31
2011-03-16 15:05:03,76.219535027,-140.669516354,0.13,0.34,0.08,0.10,0.16,0.23,0.28
2011-03-16 15:06:20,76.149599934,-140.905598158,0.14,0.37,0.08,0.10,0.16,0.24,0.29
2011-03-16 15:07:37,76.079366203,-141.139614491,0.15,0.59,0.08,0.12,0.18,0.26,0.33
2011-03-16 15:08:24,76.0361492611,-141.281861779,0.13,0.23,0.09,0.10,0.14,0.20,0.22