# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20090331.10km.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
2009-03-31 12:28:41,83.430615734,-56.840735861,0.26,0.86,0.10,0.16,0.32,0.51,0.65
2009-03-31 12:29:59,83.502048175,-56.361979671,0.31,0.85,0.14,0.22,0.37,0.61,0.74
2009-03-31 12:31:17,83.570541674,-55.844783039,0.35,0.79,0.17,0.26,0.43,0.60,0.72
2009-03-31 12:32:38,83.640709158,-55.334886544,0.32,0.78,0.15,0.22,0.39,0.55,0.71
2009-03-31 12:33:59,83.710249438,-54.818657712,0.34,0.99,0.16,0.24,0.42,0.63,0.86
2009-03-31 12:35:20,83.779144384,-54.28884108,0.38,1.11,0.13,0.25,0.49,0.76,0.99
2009-03-31 12:36:41,83.847915374,-53.746788496,0.33,1.08,0.14,0.21,0.40,0.75,0.91
2009-03-31 12:38:02,83.915929382,-53.19615804,0.27,0.71,0.12,0.19,0.34,0.46,0.57
2009-03-31 12:39:22,83.9830809197,-52.628820466,0.24,0.71,0.07,0.16,0.32,0.41,0.51
2009-03-31 12:40:41,84.05008505,-52.049619401,0.25,1.05,0.11,0.15,0.31,0.54,0.69
2009-03-31 12:41:59,84.116231399,-51.45997511,0.26,1.27,0.12,0.18,0.31,0.44,0.60
2009-03-31 12:43:18,84.181799132,-50.85606187,0.23,0.57,0.12,0.17,0.27,0.37,0.47
2009-03-31 12:44:37,84.247073546,-50.237611831,0.20,0.64,0.10,0.14,0.25,0.36,0.50
2009-03-31 12:45:55,84.311324549,-49.607768027,0.23,0.55,0.12,0.16,0.28,0.41,0.51
2009-03-31 12:47:13,84.374933002,-48.962685365,0.26,0.71,0.13,0.19,0.31,0.44,0.55
2009-03-31 12:48:31,84.438076401,-48.300910704,0.23,0.72,0.11,0.16,0.28,0.39,0.49
2009-03-31 12:49:49,84.5001144,-47.626817115,0.19,0.56,0.10,0.13,0.24,0.35,0.44
2009-03-31 12:51:07,84.561543466,-46.937784208,0.23,0.74,0.11,0.16,0.28,0.37,0.45
2009-03-31 12:52:25,84.62240636,-46.230279668,0.19,0.53,0.08,0.12,0.24,0.34,0.40
2009-03-31 12:53:42,84.682201471,-45.510948181,0.20,0.58,0.10,0.14,0.24,0.36,0.49
2009-03-31 12:54:59,84.741122269,-44.774102966,0.20,0.64,0.10,0.14,0.24,0.36,0.50
2009-03-31 12:56:15,84.799477181,-44.016875436,0.22,0.59,0.07,0.13,0.30,0.40,0.47
2009-03-31 12:57:31,84.8566731,-43.248420774,0.24,0.68,0.07,0.17,0.30,0.46,0.54
2009-03-31 12:58:47,84.9128008405,-42.461422383,0.26,0.58,0.13,0.20,0.32,0.41,0.51
2009-03-31 13:00:03,84.968395181,-41.653821406,0.26,0.67,0.11,0.18,0.32,0.46,0.56
2009-03-31 13:01:18,85.022648139,-40.833031771,0.21,0.71,0.11,0.16,0.25,0.36,0.43
2009-03-31 13:02:33,85.075861769,-39.99436983,0.23,0.67,0.12,0.17,0.28,0.37,0.52
2009-03-31 13:03:47,85.128431421,-39.132997491,0.24,0.55,0.11,0.17,0.29,0.39,0.47
2009-03-31 13:05:01,85.179522711,-38.257438012,0.18,0.45,0.09,0.13,0.21,0.31,0.41
2009-03-31 13:06:15,85.229465465,-37.364240263,0.19,0.52,0.10,0.14,0.23,0.31,0.38
2009-03-31 13:07:30,85.2786571342,-36.4492792979,0.22,0.61,0.12,0.16,0.26,0.39,0.47
2009-03-31 13:08:44,85.326229454,-35.516220802,0.19,0.53,0.10,0.14,0.23,0.33,0.45
2009-03-31 13:09:58,85.372580802,-34.567120471,0.23,0.53,0.11,0.16,0.29,0.41,0.50
2009-03-31 13:11:13,85.417811536,-33.595278277,0.21,0.83,0.07,0.15,0.26,0.35,0.47
2009-03-31 13:12:27,85.461744327,-32.605713369,0.23,0.61,0.11,0.17,0.29,0.38,0.49
2009-03-31 13:13:41,85.504173396,-31.60029613,0.22,0.67,0.10,0.16,0.28,0.39,0.47
2009-03-31 13:14:55,85.545222451,-30.572429076,0.22,0.52,0.08,0.15,0.29,0.37,0.47
2009-03-31 13:16:10,85.585022497,-29.522893873,0.16,0.68,0.08,0.11,0.19,0.29,0.40
2009-03-31 13:17:01,85.6121808949,-28.7761687946,0.14,0.39,0.07,0.10,0.17,0.26,0.34
2009-03-31 13:22:32,85.6041242868,-23.7121952628,0.20,0.68,0.09,0.13,0.24,0.40,0.50
2009-03-31 13:23:48,85.565704634,-22.643538546,0.19,0.63,0.08,0.13,0.24,0.39,0.48
2009-03-31 13:25:04,85.525739367,-21.607615,0.20,0.53,0.11,0.15,0.23,0.34,0.46
2009-03-31 13:26:20,85.4837604016,-20.5932264306,0.19,0.40,0.10,0.15,0.23,0.31,0.34
2009-03-31 13:27:37,85.440790052,-19.586657997,0.21,0.85,0.10,0.15,0.26,0.38,0.43
2009-03-31 13:28:54,85.396034185,-18.6091546971,0.25,0.71,0.09,0.19,0.30,0.45,0.59
2009-03-31 13:30:11,85.344220272,-17.699601133,0.21,0.64,0.08,0.14,0.25,0.40,0.51
2009-03-31 13:31:30,85.28418499,-16.858119341,0.20,0.46,0.13,0.16,0.23,0.30,0.36
2009-03-31 13:32:46,85.244928929,-15.878476406,0.20,0.70,0.12,0.16,0.23,0.34,0.44
2009-03-31 13:34:02,85.2028804141,-14.9246869104,0.16,0.41,0.07,0.09,0.21,0.27,0.33
2009-03-31 13:35:19,85.15640922,-14.006489279,0.17,0.53,0.07,0.12,0.22,0.29,0.35
2009-03-31 13:36:35,85.104894534,-13.139465235,0.19,0.44,0.09,0.14,0.24,0.33,0.38
2009-03-31 13:37:51,85.052333305,-12.290265825,0.20,0.58,0.12,0.15,0.23,0.32,0.43
2009-03-31 13:39:07,84.998427334,-11.454465269,0.18,0.95,0.09,0.13,0.22,0.31,0.46
2009-03-31 13:40:22,84.943728311,-10.640838383,0.19,0.54,0.10,0.13,0.24,0.34,0.40
2009-03-31 13:41:38,84.888103869,-9.844837644,0.20,0.61,0.10,0.15,0.24,0.33,0.48
2009-03-31 13:42:54,84.831248832,-9.062297818,0.17,0.51,0.10,0.13,0.19,0.25,0.33
2009-03-31 13:44:10,84.773671342,-8.299597824,0.16,0.40,0.06,0.10,0.20,0.30,0.35
2009-03-31 13:45:25,84.715301872,-7.554096949,0.17,0.43,0.10,0.13,0.20,0.26,0.33
2009-03-31 13:46:42,84.6558087001,-6.82188669956,0.14,0.32,0.06,0.09,0.17,0.25,0.30
2009-03-31 13:47:58,84.595618228,-6.107659888,0.13,0.37,0.09,0.10,0.15,0.24,0.33
2009-03-31 13:49:14,84.53471774,-5.410415656,0.19,0.49,0.10,0.14,0.24,0.33,0.42
2009-03-31 13:50:30,84.4727277435,-4.72527901926,0.13,0.36,0.08,0.10,0.15,0.21,0.28
2009-03-31 13:51:46,84.410221891,-4.055164223,0.18,0.36,0.09,0.13,0.22,0.28,0.33
2009-03-31 13:53:03,84.347100526,-3.40262128,0.18,0.55,0.08,0.12,0.23,0.33,0.46
2009-03-31 13:54:20,84.283085406,-2.762173235,0.18,0.48,0.06,0.10,0.24,0.33,0.42
2009-03-31 13:55:37,84.218385349,-2.136534702,0.12,0.27,0.06,0.09,0.15,0.19,0.23
2009-03-31 13:56:52,84.153219604,-1.526154401,0.14,0.45,0.07,0.09,0.17,0.28,0.36
2009-03-31 13:58:07,84.086867049,-0.923835297,0.16,0.46,0.10,0.12,0.19,0.25,0.33
2009-03-31 13:59:22,84.019755109,-0.332737226,0.15,0.46,0.10,0.12,0.17,0.23,0.28
2009-03-31 14:00:36,83.952807231,0.2389980405,0.15,0.52,0.09,0.11,0.17,0.27,0.41
2009-03-31 14:01:51,83.885060556,0.798337697,0.18,0.77,0.10,0.13,0.20,0.35,0.51
2009-03-31 14:03:05,83.8165784617,1.34766316967,0.15,0.55,0.09,0.11,0.18,0.27,0.36
2009-03-31 14:04:19,83.747881371,1.882107617,0.18,0.46,0.08,0.13,0.22,0.29,0.37
2009-03-31 14:05:32,83.6786741225,2.40595623022,0.15,0.45,0.07,0.10,0.19,0.27,0.34
2009-03-31 14:06:47,83.608559962,2.921443539,0.12,0.29,0.06,0.09,0.14,0.21,0.26
2009-03-31 14:08:01,83.538416427,3.422857758,0.14,0.55,0.06,0.07,0.19,0.29,0.39
2009-03-31 14:09:17,83.467730372,3.912806658,0.15,0.33,0.07,0.11,0.18,0.25,0.28
2009-03-31 14:10:33,83.3961565125,4.395985666,0.14,0.34,0.08,0.10,0.17,0.24,0.30
2009-03-31 14:11:48,83.324615,4.866334222,0.13,0.41,0.06,0.07,0.18,0.27,0.35
2009-03-31 14:13:04,83.252668609,5.326613535,0.10,0.27,0.06,0.06,0.13,0.18,0.23
2009-03-31 14:14:20,83.179912936,5.780377837,0.15,0.47,0.08,0.10,0.19,0.28,0.38
2009-03-31 14:15:36,83.107066093,6.222045367,0.14,0.51,0.06,0.09,0.17,0.28,0.36
2009-03-31 14:16:51,83.033885122,6.65387566,0.14,0.36,0.07,0.10,0.17,0.25,0.32
2009-03-31 14:18:07,82.959977899,7.079280024,0.15,0.42,0.08,0.12,0.18,0.26,0.34
2009-03-31 14:19:23,82.885985923,7.495160631,0.14,0.32,0.07,0.08,0.19,0.25,0.28
2009-03-31 14:20:38,82.811737415,7.901358706,0.15,0.43,0.08,0.10,0.18,0.31,0.38
2009-03-31 14:21:54,82.7365821618,8.30283063125,0.17,0.45,0.09,0.12,0.21,0.31,0.37
2009-03-31 14:22:49,82.6811543857,8.59193271222,0.14,0.31,0.08,0.11,0.16,0.20,0.25
2009-03-31 15:01:24,80.3129897322,7.85968084824,0.10,0.27,0.05,0.08,0.12,0.18,0.23
2009-03-31 15:02:50,80.3701459735,7.44259189168,0.11,0.35,0.05,0.07,0.14,0.22,0.29
2009-03-31 15:04:16,80.4275541401,7.01682560366,0.14,0.39,0.03,0.10,0.17,0.25,0.32
2009-03-31 15:05:41,80.4823770772,6.59933165898,0.13,0.34,0.06,0.09,0.15,0.21,0.27
2009-03-31 15:07:06,80.5377280181,6.17098964834,0.11,0.29,0.08,0.10,0.12,0.15,0.22
2009-03-31 15:08:32,80.5924604347,5.73724665312,0.10,0.29,0.07,0.08,0.11,0.19,0.26
2009-03-31 15:09:59,80.646797942,5.297551085,0.15,0.38,0.08,0.10,0.18,0.28,0.34
2009-03-31 15:11:26,80.700486035,4.853121463,0.13,0.34,0.06,0.10,0.15,0.22,0.27
2009-03-31 15:12:53,80.7537622465,4.40437569739,0.11,0.27,0.05,0.07,0.15,0.21,0.24
2009-03-31 15:14:20,80.80631309,3.949540055,0.14,0.41,0.06,0.09,0.18,0.25,0.35
2009-03-31 15:15:48,80.858342993,3.489911053,0.07,0.12,0.05,0.06,0.08,0.09,0.10
2009-03-31 15:17:16,80.9098014289,3.02483543863,0.12,0.28,0.08,0.10,0.14,0.18,0.23
2009-03-31 15:18:44,80.960692168,2.555297889,0.12,0.36,0.08,0.09,0.14,0.24,0.32
2009-03-31 15:20:11,81.0108929679,2.08079443932,0.13,0.41,0.06,0.09,0.15,0.23,0.30
2009-03-31 15:21:39,81.0605667597,1.59947860833,0.12,0.37,0.06,0.07,0.17,0.25,0.32
2009-03-31 15:23:07,81.109520475,1.113436655,0.15,0.41,0.08,0.10,0.18,0.27,0.32
2009-03-31 15:24:36,81.1579577525,0.62282957317,0.14,0.46,0.08,0.10,0.17,0.25,0.29
2009-03-31 15:26:05,81.205666834,0.126065148,0.17,0.34,0.09,0.13,0.20,0.25,0.31
2009-03-31 15:27:33,81.252804627,-0.375445183,0.14,0.43,0.08,0.10,0.18,0.24,0.28
2009-03-31 15:29:02,81.2992027693,-0.882744142813,0.15,0.34,0.10,0.12,0.18,0.24,0.30
2009-03-31 15:30:31,81.344968749,-1.394921245,0.16,0.53,0.09,0.12,0.19,0.29,0.37
2009-03-31 15:31:59,81.3898942455,-1.91259246593,0.15,0.38,0.06,0.10,0.19,0.26,0.31
2009-03-31 15:33:28,81.434263792,-2.436268633,0.16,0.41,0.06,0.13,0.20,0.25,0.33
2009-03-31 15:34:56,81.477960402,-2.964569296,0.17,0.38,0.07,0.13,0.21,0.28,0.33
2009-03-31 15:36:23,81.5208633912,-3.4982715652,0.19,0.40,0.10,0.15,0.23,0.31,0.36
2009-03-31 15:37:49,81.562996434,-4.037898891,0.15,0.65,0.07,0.08,0.19,0.28,0.39
2009-03-31 15:39:16,81.604430375,-4.58246924,0.19,0.41,0.10,0.15,0.23,0.31,0.36
2009-03-31 15:40:42,81.645210679,-5.13233097894,0.17,0.44,0.06,0.11,0.21,0.28,0.36
2009-03-31 15:42:09,81.685043866,-5.687453168,0.15,0.53,0.06,0.09,0.20,0.29,0.37
2009-03-31 15:43:35,81.724149552,-6.247993834,0.14,0.37,0.06,0.08,0.18,0.27,0.31
2009-03-31 15:45:02,81.7625816923,-6.81431584478,0.19,0.48,0.10,0.14,0.23,0.30,0.37
2009-03-31 15:46:28,81.800034358,-7.384584731,0.12,0.42,0.07,0.08,0.15,0.24,0.34
2009-03-31 15:47:54,81.8367453676,-7.96010737462,0.23,0.57,0.08,0.16,0.30,0.40,0.47
2009-03-31 15:49:21,81.872697818,-8.541734789,0.19,0.83,0.09,0.14,0.22,0.29,0.49
2009-03-31 15:50:47,81.907751875,-9.128040396,0.20,0.50,0.09,0.15,0.24,0.32,0.39
2009-03-31 15:52:12,81.9420100381,-9.71918880341,0.20,0.50,0.08,0.14,0.26,0.36,0.42
2009-03-31 15:53:36,81.975399943,-10.315382997,0.21,0.63,0.07,0.13,0.27,0.39,0.52
2009-03-31 15:54:59,82.00791197,-10.916470268,0.20,0.52,0.06,0.15,0.25,0.33,0.43
2009-03-31 15:56:22,82.0396569569,-11.5229839809,0.23,0.61,0.08,0.16,0.29,0.42,0.50
2009-03-31 15:57:44,82.070401715,-12.1351691706,0.23,0.52,0.11,0.17,0.28,0.39,0.45
2009-03-31 15:58:33,82.0883659375,-12.5021523958,0.22,0.56,0.12,0.17,0.26,0.35,0.47
2009-03-31 16:02:35,82.283111147,-13.682405455,0.29,0.53,0.16,0.23,0.34,0.41,0.46
2009-03-31 16:03:57,82.3600825656,-14.0319248266,0.24,0.51,0.12,0.18,0.30,0.39,0.47
2009-03-31 16:05:19,82.4363145536,-14.3940757599,0.24,0.62,0.13,0.19,0.29,0.35,0.42
2009-03-31 16:06:41,82.512154715,-14.761683996,0.23,0.67,0.10,0.15,0.29,0.40,0.47
2009-03-31 16:08:03,82.587863519,-15.13758842,0.28,1.03,0.11,0.20,0.33,0.44,0.65
2009-03-31 16:09:26,82.663150523,-15.52153356,0.20,0.59,0.07,0.15,0.24,0.34,0.45
2009-03-31 16:10:49,82.738132797,-15.910913584,0.21,0.48,0.07,0.14,0.27,0.35,0.43
2009-03-31 16:15:08,82.9668762543,-17.177202732,0.19,0.48,0.10,0.14,0.23,0.33,0.41
2009-03-31 16:17:31,83.092217673,-17.89645577,0.32,0.77,0.15,0.23,0.40,0.58,0.70
2009-03-31 16:18:54,83.165071869,-18.335738697,0.34,0.79,0.16,0.27,0.41,0.51,0.63
2009-03-31 16:20:18,83.237855212,-18.785266287,0.27,0.86,0.15,0.19,0.31,0.45,0.56
2009-03-31 16:21:42,83.309854759,-19.244299498,0.27,0.58,0.15,0.20,0.32,0.43,0.50
2009-03-31 16:23:09,83.3814768821,-19.712658244,0.24,0.56,0.12,0.17,0.29,0.40,0.48
2009-03-31 16:24:36,83.452723991,-20.19209189,0.27,0.59,0.14,0.19,0.33,0.47,0.53
2009-03-31 16:26:05,83.523441759,-20.68056084,0.17,0.55,0.07,0.08,0.23,0.36,0.43
2009-03-31 16:27:35,83.593906147,-21.179247617,0.20,0.62,0.07,0.10,0.26,0.41,0.55
2009-03-31 16:29:05,83.663744051,-21.690255233,0.22,0.55,0.10,0.15,0.27,0.41,0.47
2009-03-31 16:30:36,83.733040913,-22.21105981,0.20,0.72,0.08,0.13,0.25,0.36,0.47
2009-03-31 16:31:59,83.7955817014,-22.6949549787,0.22,0.55,0.09,0.16,0.27,0.36,0.44