# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20120326.10km.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
2012-03-26 13:01:42,86.0156231766,-109.818583247,0.29,0.50,0.20,0.24,0.32,0.39,0.45
2012-03-26 13:03:10,85.9248046552,-110.598378822,0.30,0.61,0.20,0.25,0.34,0.41,0.47
2012-03-26 13:04:18,85.845545023,-111.212199754,0.27,0.53,0.19,0.23,0.31,0.39,0.45
2012-03-26 13:05:26,85.766451689,-111.814635297,0.33,0.62,0.23,0.29,0.37,0.46,0.52
2012-03-26 13:06:33,85.686907253,-112.388415115,0.29,0.51,0.21,0.24,0.32,0.40,0.48
2012-03-26 13:07:41,85.607426282,-112.939113565,0.25,0.47,0.17,0.21,0.29,0.35,0.39
2012-03-26 13:08:47,85.527678901,-113.47423747,0.27,0.60,0.16,0.22,0.32,0.42,0.51
2012-03-26 13:09:55,85.447431912,-113.987450155,0.29,0.54,0.19,0.23,0.33,0.43,0.50
2012-03-26 13:11:04,85.366942402,-114.485623609,0.24,0.42,0.17,0.20,0.27,0.33,0.38
2012-03-26 13:12:13,85.286055647,-114.965239066,0.22,0.48,0.15,0.18,0.25,0.32,0.36
2012-03-26 13:13:19,85.204845982,-115.42856166,0.23,0.61,0.16,0.18,0.26,0.36,0.49
2012-03-26 13:14:25,85.123370347,-115.877396684,0.22,0.53,0.14,0.17,0.25,0.32,0.44
2012-03-26 13:15:30,85.041566313,-116.310434811,0.25,0.44,0.17,0.21,0.29,0.37,0.42
2012-03-26 13:16:35,84.959673968,-116.734188367,0.27,0.62,0.18,0.22,0.30,0.42,0.52
2012-03-26 13:17:40,84.877203602,-117.136287844,0.25,0.45,0.16,0.21,0.28,0.37,0.42
2012-03-26 13:18:46,84.794759024,-117.532639527,0.26,0.46,0.17,0.21,0.29,0.36,0.41
2012-03-26 13:19:52,84.712075704,-117.916803892,0.26,0.49,0.16,0.21,0.30,0.38,0.43
2012-03-26 13:20:59,84.629007196,-118.285019472,0.23,0.61,0.17,0.20,0.25,0.31,0.38
2012-03-26 13:22:06,84.545834375,-118.644858316,0.23,0.54,0.15,0.19,0.26,0.36,0.48
2012-03-26 13:23:13,84.462442699,-118.993601468,0.27,0.56,0.19,0.23,0.31,0.38,0.48
2012-03-26 13:24:20,84.378920126,-119.333752776,0.26,0.53,0.17,0.21,0.30,0.37,0.44
2012-03-26 13:25:27,84.295129919,-119.661926759,0.24,0.47,0.16,0.19,0.27,0.36,0.42
2012-03-26 13:26:34,84.21122239,-119.982268234,0.26,0.46,0.18,0.21,0.30,0.39,0.43
2012-03-26 13:27:41,84.127131667,-120.293318997,0.24,0.49,0.17,0.21,0.27,0.34,0.39
2012-03-26 13:28:48,84.042849734,-120.594970637,0.22,0.39,0.15,0.19,0.25,0.30,0.36
2012-03-26 13:29:55,83.95845978,-120.889564631,0.22,0.43,0.13,0.16,0.25,0.34,0.38
2012-03-26 13:31:03,83.873887683,-121.175321148,0.25,0.73,0.16,0.20,0.27,0.39,0.50
2012-03-26 13:32:10,83.789227592,-121.454841038,0.22,0.45,0.15,0.18,0.25,0.33,0.41
2012-03-26 13:33:17,83.704320387,-121.724132266,0.21,0.44,0.14,0.17,0.25,0.32,0.40
2012-03-26 13:34:25,83.619397147,-121.989436847,0.22,0.39,0.16,0.18,0.25,0.29,0.34
2012-03-26 13:35:32,83.534299496,-122.246669149,0.24,0.54,0.16,0.20,0.27,0.37,0.45
2012-03-26 13:36:39,83.449060519,-122.496827577,0.26,0.75,0.18,0.21,0.29,0.38,0.60
2012-03-26 13:37:47,83.363739101,-122.741578474,0.29,0.60,0.19,0.24,0.34,0.41,0.44
2012-03-26 13:38:54,83.278331284,-122.980909834,0.25,0.50,0.18,0.21,0.29,0.38,0.44
2012-03-26 13:40:01,83.192828695,-123.214795813,0.25,0.45,0.16,0.20,0.29,0.35,0.40
2012-03-26 13:41:08,83.107163778,-123.441522994,0.29,0.59,0.20,0.25,0.32,0.38,0.49
2012-03-26 13:42:16,83.02141897,-123.663349602,0.24,0.49,0.16,0.20,0.27,0.33,0.39
2012-03-26 13:43:23,82.935527559,-123.878589097,0.22,0.59,0.16,0.19,0.24,0.29,0.41
2012-03-26 13:44:31,82.849594112,-124.090118543,0.20,0.59,0.13,0.17,0.23,0.30,0.36
2012-03-26 13:45:38,82.763611021,-124.297719352,0.24,0.49,0.17,0.21,0.27,0.33,0.39
2012-03-26 13:46:45,82.677531891,-124.500482616,0.25,0.61,0.15,0.19,0.29,0.45,0.53
2012-03-26 13:47:53,82.591301846,-124.696906098,0.22,0.50,0.15,0.18,0.25,0.33,0.42
2012-03-26 13:49:00,82.50501136,-124.889457634,0.23,0.41,0.15,0.19,0.27,0.34,0.37
2012-03-26 13:50:07,82.418673395,-125.078550522,0.22,0.45,0.15,0.19,0.25,0.31,0.40
2012-03-26 13:51:15,82.332267526,-125.263712265,0.20,0.37,0.14,0.17,0.23,0.28,0.30
2012-03-26 13:52:22,82.24579034,-125.445015482,0.22,0.43,0.16,0.19,0.25,0.30,0.34
2012-03-26 13:53:29,82.159237515,-125.622269147,0.25,0.61,0.15,0.20,0.29,0.38,0.44
2012-03-26 13:54:37,82.072605502,-125.795496595,0.23,0.44,0.16,0.19,0.25,0.31,0.38
2012-03-26 13:55:44,81.985896566,-125.964805805,0.23,0.42,0.15,0.20,0.27,0.32,0.38
2012-03-26 13:56:51,81.899121385,-126.130538004,0.25,0.66,0.15,0.21,0.28,0.37,0.55
2012-03-26 13:57:58,81.812327486,-126.294053597,0.22,0.45,0.14,0.19,0.26,0.32,0.36
2012-03-26 13:59:07,81.725467382,-126.454190633,0.21,0.39,0.15,0.18,0.24,0.30,0.36
2012-03-26 14:00:16,81.638521943,-126.610327552,0.24,0.46,0.16,0.20,0.27,0.33,0.39
2012-03-26 14:01:25,81.551492286,-126.762621419,0.20,0.45,0.14,0.16,0.22,0.28,0.37
2012-03-26 14:02:34,81.464513772,-126.914711446,0.22,0.46,0.15,0.18,0.25,0.34,0.41
2012-03-26 14:03:43,81.377399958,-127.061692263,0.25,0.53,0.16,0.20,0.28,0.37,0.45
2012-03-26 14:04:51,81.290235164,-127.205843863,0.25,0.52,0.16,0.20,0.28,0.38,0.46
2012-03-26 14:06:00,81.203027431,-127.347470937,0.21,0.45,0.13,0.17,0.24,0.31,0.39
2012-03-26 14:07:09,81.115785854,-127.486821037,0.21,0.44,0.14,0.17,0.25,0.32,0.37
2012-03-26 14:08:18,81.028510026,-127.623911098,0.24,0.57,0.15,0.19,0.27,0.37,0.46
2012-03-26 14:09:26,80.941147387,-127.757375058,0.21,0.47,0.14,0.17,0.23,0.30,0.36
2012-03-26 14:10:35,80.853770957,-127.88917437,0.24,0.59,0.14,0.20,0.27,0.36,0.41
2012-03-26 14:11:44,80.766288449,-128.016482202,0.27,0.51,0.17,0.22,0.30,0.38,0.43
2012-03-26 14:12:52,80.678952409,-128.146923914,0.20,0.45,0.13,0.16,0.24,0.31,0.35
2012-03-26 14:14:01,80.591456567,-128.271993973,0.22,0.51,0.14,0.17,0.25,0.35,0.42
2012-03-26 14:15:10,80.503898883,-128.394283321,0.25,0.48,0.15,0.20,0.28,0.36,0.44
2012-03-26 14:16:18,80.416365454,-128.516077913,0.19,0.50,0.13,0.16,0.21,0.28,0.37
2012-03-26 14:17:27,80.328721255,-128.633525312,0.20,0.37,0.12,0.16,0.23,0.30,0.35
2012-03-26 14:18:34,80.2427747101,-128.748646025,0.20,0.44,0.13,0.16,0.22,0.30,0.37
2012-03-26 14:27:46,80.1398497672,-128.89055936,0.15,0.43,0.08,0.11,0.18,0.27,0.35
2012-03-26 14:29:10,80.22859361,-128.773488827,0.15,0.64,0.06,0.10,0.17,0.28,0.46
2012-03-26 14:30:37,80.317300188,-128.656000269,0.16,0.43,0.08,0.11,0.19,0.29,0.38
2012-03-26 14:32:04,80.405065692,-128.537187315,0.15,0.51,0.08,0.11,0.17,0.30,0.40
2012-03-26 14:33:33,80.492643048,-128.416667642,0.20,0.65,0.09,0.14,0.25,0.36,0.52
2012-03-26 14:35:02,80.580178092,-128.293928713,0.18,0.65,0.09,0.12,0.22,0.36,0.52
2012-03-26 14:36:30,80.667704329,-128.169821672,0.15,0.52,0.08,0.10,0.18,0.28,0.37
2012-03-26 14:37:56,80.755169264,-128.04287795,0.20,0.58,0.09,0.14,0.24,0.35,0.44
2012-03-26 14:39:22,80.84259893,-127.913832156,0.19,0.54,0.09,0.14,0.23,0.33,0.41
2012-03-26 14:40:48,80.929967819,-127.78195194,0.16,0.52,0.08,0.12,0.19,0.28,0.41
2012-03-26 14:42:15,81.017306582,-127.648014334,0.20,0.79,0.09,0.14,0.23,0.39,0.60
2012-03-26 14:43:42,81.104613354,-127.511931863,0.18,0.59,0.09,0.12,0.22,0.33,0.46
2012-03-26 14:45:09,81.191833584,-127.372189914,0.17,0.58,0.08,0.12,0.20,0.33,0.44
2012-03-26 14:46:37,81.27907429,-127.231620216,0.20,0.61,0.10,0.13,0.24,0.40,0.54
2012-03-26 14:48:05,81.366227469,-127.087316549,0.19,0.54,0.09,0.13,0.23,0.33,0.39
2012-03-26 14:49:33,81.453333145,-126.940310282,0.18,0.57,0.09,0.12,0.21,0.32,0.47
2012-03-26 14:51:01,81.540364757,-126.789832933,0.16,0.56,0.09,0.12,0.19,0.27,0.39
2012-03-26 14:52:30,81.627400026,-126.6378836,0.19,0.51,0.10,0.14,0.22,0.31,0.43
2012-03-26 14:53:58,81.714337677,-126.481752333,0.17,0.47,0.08,0.12,0.20,0.30,0.37
2012-03-26 14:55:26,81.801217044,-126.322442204,0.18,0.54,0.08,0.13,0.21,0.31,0.36
2012-03-26 14:56:54,81.888036439,-126.159857121,0.21,0.93,0.10,0.15,0.25,0.37,0.58
2012-03-26 14:58:23,81.974798846,-125.993976249,0.21,0.52,0.09,0.15,0.27,0.36,0.45
2012-03-26 14:59:51,82.061515428,-125.825091596,0.19,0.44,0.10,0.15,0.23,0.30,0.39
2012-03-26 15:01:20,82.148167717,-125.652653409,0.20,0.56,0.09,0.14,0.25,0.36,0.46
2012-03-26 15:02:49,82.234801507,-125.477924049,0.17,0.43,0.10,0.13,0.21,0.26,0.35
2012-03-26 15:04:17,82.321244355,-125.296111802,0.18,0.37,0.10,0.14,0.21,0.30,0.33
2012-03-26 15:05:46,82.407652627,-125.111249581,0.18,0.77,0.10,0.13,0.21,0.33,0.45
2012-03-26 15:07:14,82.494045094,-124.923842256,0.18,0.52,0.09,0.13,0.22,0.31,0.37
2012-03-26 15:08:43,82.580345236,-124.731844527,0.20,0.59,0.10,0.14,0.26,0.36,0.45
2012-03-26 15:10:11,82.666534951,-124.534786966,0.22,0.66,0.11,0.15,0.25,0.43,0.54
2012-03-26 15:11:40,82.752628764,-124.332706343,0.20,0.63,0.11,0.15,0.24,0.34,0.42
2012-03-26 15:13:08,82.838688347,-124.127316744,0.16,0.52,0.10,0.12,0.19,0.24,0.33
2012-03-26 15:14:36,82.9245754,-123.914864167,0.18,0.97,0.10,0.14,0.21,0.28,0.38
2012-03-26 15:16:05,83.010417386,-123.698634118,0.20,0.46,0.10,0.16,0.23,0.32,0.38
2012-03-26 15:17:33,83.096254806,-123.479597883,0.23,0.49,0.12,0.17,0.27,0.36,0.43
2012-03-26 15:19:02,83.181863441,-123.251736938,0.19,0.51,0.10,0.14,0.24,0.33,0.42
2012-03-26 15:20:30,83.267521241,-123.022328185,0.21,0.58,0.12,0.15,0.24,0.37,0.47
2012-03-26 15:21:59,83.352893432,-122.782391975,0.25,0.52,0.12,0.18,0.31,0.42,0.49
2012-03-26 15:23:28,83.438267602,-122.539427038,0.22,0.90,0.10,0.15,0.26,0.39,0.64
2012-03-26 15:24:57,83.523478793,-122.288930588,0.19,0.55,0.10,0.14,0.22,0.36,0.44
2012-03-26 15:26:26,83.60857632,-122.032122479,0.18,0.65,0.10,0.13,0.21,0.31,0.43
2012-03-26 15:27:55,83.693556555,-121.768787042,0.17,0.53,0.09,0.12,0.20,0.29,0.35
2012-03-26 15:29:24,83.778477965,-121.500321314,0.18,0.47,0.09,0.13,0.23,0.31,0.40
2012-03-26 15:30:52,83.863139051,-121.221248242,0.19,0.76,0.10,0.14,0.22,0.30,0.41
2012-03-26 15:32:21,83.947770343,-120.937536925,0.19,0.75,0.08,0.13,0.24,0.35,0.48
2012-03-26 15:33:50,84.032221133,-120.645060152,0.17,0.48,0.08,0.11,0.21,0.29,0.38
2012-03-26 15:35:19,84.116497861,-120.343831852,0.19,0.57,0.10,0.14,0.23,0.33,0.40
2012-03-26 15:36:48,84.200601799,-120.033691591,0.22,0.56,0.10,0.14,0.28,0.38,0.46
2012-03-26 15:38:17,84.284548414,-119.714897673,0.19,0.49,0.10,0.14,0.22,0.31,0.41
2012-03-26 15:39:46,84.368431042,-119.38969131,0.21,0.63,0.09,0.14,0.26,0.35,0.42
2012-03-26 15:41:14,84.451953203,-119.050164654,0.22,0.58,0.11,0.16,0.27,0.40,0.51
2012-03-26 15:42:43,84.535352433,-118.702252896,0.19,0.62,0.10,0.13,0.22,0.32,0.43
2012-03-26 15:44:12,84.618569984,-118.344266444,0.18,0.62,0.10,0.13,0.21,0.30,0.39
2012-03-26 15:45:41,84.701544717,-117.974375675,0.21,0.50,0.11,0.15,0.26,0.35,0.45
2012-03-26 15:47:09,84.784348965,-117.594224101,0.20,0.50,0.09,0.14,0.25,0.34,0.42
2012-03-26 15:48:38,84.866937499,-117.202381756,0.19,0.49,0.08,0.14,0.25,0.35,0.42
2012-03-26 15:50:06,84.94924106,-116.796756922,0.22,0.68,0.12,0.16,0.25,0.42,0.58
2012-03-26 15:51:34,85.031364863,-116.379832865,0.19,0.61,0.10,0.13,0.24,0.35,0.45
2012-03-26 15:53:02,85.113137092,-115.946877079,0.18,0.80,0.09,0.11,0.21,0.32,0.45
2012-03-26 15:54:31,85.194631551,-115.499495905,0.18,0.60,0.10,0.12,0.21,0.36,0.48
2012-03-26 15:55:59,85.275917153,-115.039080855,0.16,0.52,0.08,0.11,0.18,0.31,0.42
2012-03-26 15:57:27,85.356836704,-114.561304881,0.18,0.46,0.10,0.13,0.22,0.32,0.40
2012-03-26 15:58:55,85.437425423,-114.066710679,0.21,0.66,0.11,0.15,0.25,0.36,0.50
2012-03-26 16:00:23,85.517698982,-113.555309864,0.24,0.58,0.11,0.18,0.30,0.41,0.49
2012-03-26 16:01:51,85.597518239,-113.02313076,0.19,0.55,0.10,0.14,0.23,0.34,0.42
2012-03-26 16:03:19,85.67710039,-112.475299293,0.22,0.52,0.10,0.15,0.26,0.37,0.47
2012-03-26 16:04:47,85.756229258,-111.905901876,0.25,0.63,0.12,0.18,0.31,0.41,0.56
2012-03-26 16:06:14,85.834954447,-111.315710441,0.22,0.63,0.10,0.15,0.27,0.41,0.51
2012-03-26 16:07:42,85.913265781,-110.702403193,0.22,0.67,0.09,0.15,0.27,0.37,0.51
2012-03-26 16:09:06,85.9875203186,-110.093800813,0.19,0.54,0.10,0.13,0.24,0.34,0.41