# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20150403.10km.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
2015-04-03 12:37:31,80.580245696,-97.308064168,0.29,0.78,0.11,0.19,0.37,0.53,0.64
2015-04-03 12:38:56,80.6102692583,-97.8262009929,0.37,1.23,0.20,0.27,0.43,0.62,0.98
2015-04-03 12:40:21,80.639439787,-98.347764019,0.33,0.86,0.14,0.24,0.39,0.56,0.71
2015-04-03 12:41:45,80.667392423,-98.873436373,0.37,1.12,0.20,0.29,0.42,0.58,0.81
2015-04-03 12:43:10,80.694885644,-99.401569292,0.34,0.87,0.18,0.26,0.40,0.54,0.68
2015-04-03 12:44:35,80.721776211,-99.932414262,0.34,0.73,0.19,0.25,0.41,0.57,0.64
2015-04-03 12:45:59,80.747810341,-100.466411302,0.34,1.17,0.16,0.23,0.42,0.62,0.79
2015-04-03 12:47:24,80.773179495,-101.003121247,0.35,0.82,0.20,0.27,0.40,0.56,0.70
2015-04-03 12:48:49,80.797727593,-101.542752112,0.34,0.85,0.18,0.26,0.40,0.57,0.74
2015-04-03 12:50:14,80.821359356,-102.085379369,0.28,0.68,0.13,0.20,0.34,0.48,0.59
2015-04-03 12:51:38,80.844030792,-102.630975513,0.23,0.60,0.11,0.16,0.30,0.41,0.52
2015-04-03 12:53:02,80.866114507,-103.178837818,0.33,0.78,0.14,0.24,0.40,0.54,0.63
2015-04-03 12:54:26,80.887291056,-103.729409459,0.35,0.91,0.15,0.26,0.43,0.58,0.70
2015-04-03 12:55:50,80.907728033,-104.282352013,0.29,0.72,0.17,0.22,0.34,0.44,0.60
2015-04-03 12:57:14,80.927308511,-104.83774047,0.26,0.70,0.14,0.18,0.31,0.47,0.61
2015-04-03 12:58:37,80.946023293,-105.395488682,0.33,0.86,0.12,0.22,0.44,0.66,0.76
2015-04-03 13:00:00,80.963895569,-105.955469346,0.31,0.70,0.15,0.23,0.37,0.48,0.55
2015-04-03 13:01:24,80.980887282,-106.517628392,0.26,0.67,0.13,0.20,0.32,0.42,0.51
2015-04-03 13:02:48,80.996992344,-107.081868833,0.26,0.54,0.15,0.21,0.30,0.40,0.47
2015-04-03 13:04:13,81.012329,-107.647973177,0.28,0.99,0.14,0.21,0.33,0.45,0.57
2015-04-03 13:05:37,81.026785339,-108.215955403,0.24,0.68,0.07,0.14,0.32,0.45,0.51
2015-04-03 13:07:01,81.040359321,-108.785711978,0.28,0.93,0.11,0.18,0.35,0.49,0.60
2015-04-03 13:08:25,81.053039053,-109.357143135,0.25,0.79,0.12,0.17,0.31,0.45,0.62
2015-04-03 13:11:03,81.07402449,-110.436342463,0.28,0.85,0.11,0.20,0.35,0.51,0.68
2015-04-03 13:13:36,81.092267977,-111.483529635,0.26,0.66,0.11,0.18,0.32,0.47,0.60
2015-04-03 13:15:00,81.100789721,-112.061330517,0.31,0.86,0.15,0.22,0.37,0.52,0.63
2015-04-03 13:16:24,81.10848233,-112.640137543,0.30,0.86,0.14,0.22,0.36,0.50,0.62
2015-04-03 13:17:48,81.115127398,-113.219948073,0.28,0.70,0.13,0.20,0.35,0.50,0.61
2015-04-03 13:19:11,81.121029219,-113.800499597,0.30,1.00,0.15,0.22,0.36,0.49,0.64
2015-04-03 13:20:35,81.125970273,-114.381775303,0.31,0.86,0.12,0.22,0.37,0.55,0.74
2015-04-03 13:21:58,81.130063749,-114.963625722,0.26,0.65,0.13,0.20,0.33,0.45,0.54
2015-04-03 13:23:19,81.133125831,-115.545982486,0.26,0.75,0.13,0.19,0.31,0.42,0.57
2015-04-03 13:24:42,81.135395688,-116.128663105,0.27,0.78,0.12,0.18,0.34,0.51,0.64
2015-04-03 13:26:04,81.136775704,-116.7115788,0.27,0.85,0.13,0.19,0.33,0.47,0.58
2015-04-03 13:27:27,81.137137163,-117.294614154,0.26,0.74,0.13,0.19,0.30,0.47,0.56
2015-04-03 13:28:49,81.136676419,-117.877639086,0.23,0.78,0.10,0.16,0.29,0.39,0.59
2015-04-03 13:30:11,81.135348725,-118.46054716,0.24,0.59,0.11,0.17,0.29,0.40,0.52
2015-04-03 13:31:33,81.133074272,-119.043226606,0.23,0.58,0.11,0.17,0.29,0.40,0.48
2015-04-03 13:32:55,81.129811407,-119.625527205,0.20,0.74,0.09,0.15,0.25,0.35,0.43
2015-04-03 13:34:18,81.125706761,-120.207361867,0.26,1.07,0.12,0.18,0.31,0.50,0.74
2015-04-03 13:35:40,81.120807762,-120.788645102,0.27,1.07,0.12,0.17,0.33,0.48,0.83
2015-04-03 13:37:02,81.114805352,-121.369137095,0.27,0.79,0.13,0.19,0.32,0.49,0.64
2015-04-03 13:38:24,81.108422077,-121.949056071,0.26,0.80,0.11,0.19,0.31,0.45,0.56
2015-04-03 13:39:46,81.100609876,-122.527777974,0.23,0.80,0.13,0.17,0.27,0.38,0.48
2015-04-03 13:41:08,81.091902622,-123.105448877,0.26,0.64,0.12,0.19,0.32,0.45,0.57
2015-04-03 13:42:30,81.082448497,-123.682042538,0.26,0.69,0.10,0.16,0.32,0.50,0.60
2015-04-03 13:43:52,81.072103706,-124.2573634,0.20,0.64,0.11,0.15,0.24,0.33,0.44
2015-04-03 13:46:09,81.052673946,-125.212683471,0.29,0.74,0.14,0.21,0.36,0.46,0.62
2015-04-03 13:48:08,81.034045164,-126.04757949,0.24,0.84,0.13,0.19,0.28,0.36,0.45
2015-04-03 13:49:30,81.020120803,-126.616580774,0.23,0.64,0.12,0.18,0.26,0.38,0.51
2015-04-03 13:50:51,81.005259591,-127.183703271,0.25,0.60,0.13,0.18,0.30,0.42,0.54
2015-04-03 13:52:13,80.989589753,-127.748978167,0.21,0.76,0.10,0.15,0.25,0.35,0.56
2015-04-03 13:53:35,80.97303332,-128.312218231,0.24,0.73,0.14,0.19,0.28,0.37,0.47
2015-04-03 13:54:56,80.955607618,-128.873337197,0.24,0.65,0.12,0.16,0.29,0.44,0.54
2015-04-03 13:56:17,80.937343952,-129.43227066,0.27,0.80,0.13,0.19,0.33,0.52,0.67
2015-04-03 13:57:38,80.9182448,-129.988955914,0.22,0.73,0.12,0.17,0.26,0.34,0.48
2015-04-03 13:58:59,80.898300485,-130.543265056,0.21,0.53,0.11,0.15,0.26,0.35,0.41
2015-04-03 14:00:21,80.877538863,-131.095144145,0.24,0.68,0.11,0.16,0.30,0.44,0.53
2015-04-03 14:01:42,80.855918849,-131.6444395,0.33,1.30,0.12,0.20,0.40,0.76,1.06
2015-04-03 14:03:03,80.833498071,-132.191148318,0.24,0.61,0.14,0.19,0.28,0.39,0.51
2015-04-03 14:04:24,80.810243756,-132.735130374,0.29,0.99,0.12,0.18,0.32,0.60,0.89
2015-04-03 14:05:45,80.786222111,-133.276436689,0.21,0.57,0.12,0.16,0.25,0.35,0.47
2015-04-03 14:07:05,80.761346918,-133.814809187,0.23,0.63,0.11,0.16,0.27,0.42,0.52
2015-04-03 14:08:25,80.735692732,-134.350303721,0.22,0.56,0.11,0.16,0.27,0.39,0.48
2015-04-03 14:09:45,80.709271064,-134.882865597,0.22,0.72,0.10,0.15,0.27,0.40,0.52
2015-04-03 14:11:05,80.682031758,-135.41231881,0.18,0.63,0.10,0.13,0.22,0.32,0.42
2015-04-03 14:12:25,80.654030498,-135.938697745,0.21,0.50,0.11,0.17,0.25,0.34,0.41
2015-04-03 14:13:46,80.625241979,-136.461876274,0.23,0.56,0.13,0.16,0.27,0.39,0.48
2015-04-03 14:15:05,80.595439434,-136.981300367,0.23,0.54,0.11,0.16,0.28,0.40,0.49
2015-04-03 14:16:25,80.565514464,-137.498843626,0.18,0.52,0.06,0.12,0.23,0.33,0.45
2015-04-03 14:17:45,80.534092274,-138.011402746,0.13,0.33,0.06,0.10,0.16,0.22,0.27
2015-04-03 14:19:05,80.502419766,-138.521697536,0.19,0.65,0.11,0.14,0.22,0.37,0.51
2015-04-03 14:20:25,80.46991329,-139.028355238,0.20,0.64,0.10,0.14,0.25,0.35,0.45
2015-04-03 14:21:44,80.436778891,-139.531796755,0.21,0.64,0.12,0.15,0.24,0.38,0.47
2015-04-03 14:23:04,80.402854478,-140.031762968,0.19,0.66,0.12,0.15,0.21,0.29,0.39
2015-04-03 14:24:28,80.366084263,-140.55803132,0.20,0.47,0.10,0.15,0.24,0.31,0.37
2015-04-03 14:25:56,80.326881934,-141.102858662,0.19,0.49,0.10,0.14,0.23,0.31,0.39
2015-04-03 14:27:23,80.286763846,-141.642833622,0.22,0.52,0.11,0.16,0.26,0.36,0.43
2015-04-03 14:28:26,80.2577154397,-142.024321142,0.24,0.53,0.13,0.19,0.28,0.34,0.43
2015-04-03 14:36:44,79.7082633267,-142.097887728,0.16,0.74,0.05,0.10,0.21,0.31,0.42
2015-04-03 14:44:48,79.212684708,-141.177806984,0.18,0.96,0.09,0.13,0.22,0.30,0.46
2015-04-03 14:46:10,79.189940938,-140.709926356,0.15,0.56,0.09,0.11,0.18,0.26,0.37
2015-04-03 14:47:32,79.16653827,-140.243923457,0.15,0.50,0.06,0.12,0.18,0.26,0.30
2015-04-03 14:48:55,79.142404748,-139.780014031,0.16,0.53,0.09,0.12,0.20,0.28,0.33
2015-04-03 14:50:17,79.117601024,-139.318120686,0.18,0.44,0.09,0.12,0.22,0.30,0.37
2015-04-03 14:51:39,79.092165802,-138.85963005,0.19,0.48,0.11,0.14,0.22,0.33,0.42
2015-04-03 14:53:00,79.066164449,-138.40579824,0.20,0.51,0.12,0.15,0.23,0.35,0.43
2015-04-03 14:54:22,79.039499924,-137.954080517,0.19,0.57,0.06,0.15,0.23,0.33,0.40
2015-04-03 14:55:43,79.012190718,-137.504527778,0.16,0.47,0.07,0.12,0.19,0.29,0.41
2015-04-03 14:57:04,78.984248949,-137.057163999,0.17,0.50,0.10,0.12,0.20,0.29,0.35
2015-04-03 14:58:25,78.955463061,-136.61240615,0.18,0.54,0.09,0.12,0.21,0.33,0.40
2015-04-03 14:59:45,78.926093447,-136.169846697,0.19,0.69,0.09,0.13,0.23,0.38,0.52
2015-04-03 15:01:06,78.896327063,-135.729176345,0.14,0.43,0.05,0.06,0.17,0.30,0.36
2015-04-03 15:02:27,78.865802417,-135.291073879,0.18,0.68,0.09,0.11,0.21,0.33,0.50
2015-04-03 15:03:47,78.834642105,-134.855369476,0.21,0.50,0.11,0.15,0.25,0.36,0.43
2015-04-03 15:05:07,78.80288358,-134.422031377,0.20,0.72,0.10,0.14,0.24,0.35,0.49
2015-04-03 15:06:27,78.770423566,-133.991300348,0.20,0.59,0.12,0.16,0.23,0.33,0.42
2015-04-03 15:07:47,78.737364614,-133.563013723,0.20,0.63,0.11,0.15,0.24,0.35,0.48
2015-04-03 15:09:07,78.703734849,-133.137145551,0.20,0.58,0.10,0.15,0.25,0.36,0.47
2015-04-03 15:10:28,78.66945226,-132.713895187,0.20,0.82,0.10,0.14,0.24,0.37,0.54
2015-04-03 15:11:48,78.634616989,-132.293080373,0.19,0.66,0.09,0.12,0.24,0.37,0.49
2015-04-03 15:13:09,78.599149553,-131.874911721,0.05,0.20,0.05,0.05,0.05,0.06,0.16
2015-04-03 15:14:29,78.563176716,-131.459141382,0.05,0.06,0.05,0.05,0.05,0.05,0.06
2015-04-03 15:15:49,78.52651099,-131.04621563,0.05,0.06,0.04,0.05,0.05,0.05,0.05
2015-04-03 15:17:09,78.489321573,-130.635787031,0.15,0.61,0.05,0.08,0.20,0.29,0.45
2015-04-03 15:18:29,78.451530871,-130.228060991,0.20,1.07,0.07,0.12,0.26,0.39,0.64
2015-04-03 15:19:49,78.413249322,-129.822801642,0.05,0.06,0.05,0.05,0.05,0.05,0.06
2015-04-03 15:21:09,78.374346248,-129.420330464,0.14,0.52,0.05,0.09,0.18,0.28,0.37
2015-04-03 15:22:29,78.334914457,-129.020463484,0.12,0.59,0.05,0.05,0.17,0.27,0.38
2015-04-03 15:23:49,78.294887094,-128.623389194,0.18,0.67,0.07,0.12,0.22,0.34,0.54
2015-04-03 15:25:09,78.254392565,-128.228813458,0.21,0.49,0.11,0.16,0.25,0.36,0.41
2015-04-03 15:26:29,78.213295349,-127.837096544,0.22,0.98,0.11,0.16,0.26,0.38,0.64
2015-04-03 15:27:48,78.171706352,-127.447981612,0.24,1.13,0.10,0.17,0.29,0.42,0.52
2015-04-03 15:29:08,78.129540335,-127.061691822,0.21,0.68,0.09,0.14,0.27,0.42,0.55
2015-04-03 15:30:28,78.086902153,-126.67798596,0.29,0.71,0.13,0.23,0.36,0.46,0.56
2015-04-03 15:31:47,78.043752507,-126.29698492,0.22,0.45,0.11,0.17,0.26,0.34,0.39
2015-04-03 15:33:06,78.000046207,-125.918827646,0.31,1.28,0.15,0.22,0.36,0.56,0.88
2015-04-03 15:34:26,77.955885858,-125.54325713,0.33,1.06,0.11,0.21,0.41,0.65,0.92
2015-04-03 15:35:46,77.911178624,-125.170539717,0.33,1.00,0.15,0.21,0.41,0.66,0.83
2015-04-03 15:37:06,77.866000314,-124.800487145,0.24,0.63,0.06,0.16,0.31,0.44,0.56
2015-04-03 15:38:26,77.820388938,-124.432994201,0.06,0.09,0.05,0.05,0.06,0.07,0.08
2015-04-03 15:39:47,77.774245865,-124.068350443,0.29,1.44,0.09,0.17,0.37,0.55,0.86
2015-04-03 15:41:08,77.727648292,-123.706358472,0.25,1.10,0.12,0.18,0.29,0.44,0.79
2015-04-03 15:42:28,77.680568151,-123.347109723,0.28,0.92,0.06,0.17,0.37,0.58,0.69
2015-04-03 15:43:48,77.632988978,-122.990667157,0.26,1.17,0.06,0.15,0.34,0.52,0.66
2015-04-03 15:45:07,77.585004521,-122.636766804,0.28,0.71,0.14,0.19,0.34,0.51,0.63
2015-04-03 15:46:26,77.536465168,-122.28588615,0.30,1.06,0.13,0.20,0.36,0.54,0.72
2015-04-03 15:47:44,77.487515994,-121.937452725,0.29,0.79,0.13,0.21,0.36,0.51,0.68
2015-04-03 15:49:03,77.438099313,-121.591427685,0.28,1.41,0.13,0.19,0.34,0.46,0.77
2015-04-03 15:50:22,77.38824637,-121.248071994,0.30,0.77,0.15,0.22,0.36,0.50,0.67
2015-04-03 15:51:41,77.337972191,-120.907351555,0.33,1.07,0.15,0.24,0.41,0.56,0.74
2015-04-03 15:52:59,77.28729759,-120.569210819,0.32,1.00,0.15,0.24,0.39,0.51,0.69
2015-04-03 15:54:18,77.236102772,-120.233998813,0.29,1.24,0.08,0.21,0.36,0.47,0.56
2015-04-03 15:55:04,77.2064794452,-120.041183787,0.35,0.58,0.21,0.28,0.41,0.49,0.55