# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20170324.10km.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
2017-03-24 13:45:44,82.4601903854,-55.4115800713,0.32,1.10,0.17,0.27,0.37,0.45,0.67
2017-03-24 13:47:00,82.539194056,-55.237218783,0.37,1.09,0.15,0.25,0.47,0.70,0.85
2017-03-24 13:48:22,82.625424661,-55.042144344,0.32,0.70,0.16,0.26,0.38,0.48,0.62
2017-03-24 13:49:45,82.711570836,-54.842658504,0.31,0.65,0.20,0.25,0.35,0.45,0.53
2017-03-24 13:51:08,82.797659178,-54.639175374,0.27,0.59,0.16,0.22,0.30,0.38,0.48
2017-03-24 13:52:30,82.883652306,-54.430732802,0.25,0.67,0.14,0.19,0.30,0.41,0.50
2017-03-24 13:53:53,82.969551408,-54.217245833,0.26,0.76,0.15,0.20,0.31,0.38,0.50
2017-03-24 13:55:16,83.055352293,-53.998523792,0.22,0.63,0.10,0.14,0.28,0.41,0.52
2017-03-24 13:56:39,83.141047791,-53.774264567,0.23,0.71,0.13,0.18,0.26,0.37,0.44
2017-03-24 13:58:02,83.22666408,-53.545113678,0.24,1.03,0.12,0.18,0.28,0.43,0.66
2017-03-24 13:59:26,83.3121751,-53.310231365,0.25,0.66,0.14,0.20,0.30,0.38,0.44
2017-03-24 14:00:49,83.397570815,-53.069291326,0.29,0.58,0.17,0.23,0.35,0.44,0.52
2017-03-24 14:02:13,83.482850817,-52.82216007,0.29,0.76,0.13,0.20,0.35,0.52,0.67
2017-03-24 14:03:37,83.568000167,-52.568303474,0.31,0.76,0.18,0.24,0.35,0.48,0.58
2017-03-24 14:05:01,83.653043466,-52.30817392,0.30,0.80,0.14,0.21,0.35,0.55,0.67
2017-03-24 14:06:25,83.737978548,-52.041716239,0.17,0.55,0.09,0.11,0.21,0.35,0.47
2017-03-24 14:07:48,83.822764304,-51.76773703,0.27,0.66,0.13,0.21,0.31,0.42,0.56
2017-03-24 14:09:11,83.907411565,-51.486240338,0.19,0.63,0.05,0.13,0.24,0.37,0.51
2017-03-24 14:10:34,83.991906643,-51.196862036,0.20,0.49,0.10,0.15,0.23,0.32,0.37
2017-03-24 14:11:56,84.076252138,-50.899426314,0.21,0.58,0.11,0.15,0.26,0.36,0.44
2017-03-24 14:13:20,84.160463823,-50.594157203,0.21,0.57,0.10,0.15,0.24,0.36,0.49
2017-03-24 14:14:43,84.244504118,-50.279943401,0.28,0.76,0.03,0.12,0.42,0.55,0.65
2017-03-24 14:16:06,84.328372887,-49.956640866,0.22,0.59,0.08,0.16,0.26,0.38,0.47
2017-03-24 14:17:28,84.412053583,-49.623568482,0.25,0.71,0.11,0.19,0.30,0.39,0.47
2017-03-24 14:18:49,84.4955983009,-49.2801987932,0.21,0.56,0.03,0.15,0.27,0.38,0.48
2017-03-24 14:20:11,84.578853147,-48.927506359,0.22,0.51,0.12,0.16,0.27,0.39,0.47
2017-03-24 14:21:33,84.661963247,-48.563829086,0.20,0.53,0.10,0.15,0.24,0.31,0.40
2017-03-24 14:22:55,84.744864184,-48.188953599,0.22,0.59,0.12,0.16,0.27,0.41,0.50
2017-03-24 14:24:20,84.827518296,-47.801696736,0.19,0.56,0.09,0.13,0.23,0.40,0.52
2017-03-24 14:25:47,84.909940519,-47.402332132,0.21,0.61,0.06,0.13,0.28,0.41,0.47
2017-03-24 14:27:14,84.992107983,-46.989818628,0.17,0.66,0.08,0.13,0.21,0.29,0.37
2017-03-24 14:28:40,85.074062593,-46.564909511,0.21,0.53,0.11,0.15,0.25,0.33,0.40
2017-03-24 14:30:07,85.155719209,-46.125180082,0.20,0.50,0.04,0.14,0.26,0.36,0.45
2017-03-24 14:31:33,85.237091296,-45.670669863,0.22,0.50,0.11,0.17,0.27,0.36,0.45
2017-03-24 14:33:00,85.318158271,-45.200511222,0.19,0.41,0.09,0.14,0.22,0.32,0.39
2017-03-24 14:34:27,85.398904086,-44.71400657,0.22,0.47,0.11,0.17,0.26,0.33,0.38
2017-03-24 14:35:53,85.47933467,-44.210930571,0.20,0.56,0.12,0.15,0.23,0.33,0.39
2017-03-24 14:37:19,85.559403852,-43.689682359,0.17,0.63,0.09,0.12,0.20,0.30,0.42
2017-03-24 14:38:46,85.639111153,-43.149707775,0.17,0.35,0.10,0.13,0.19,0.25,0.30
2017-03-24 14:40:12,85.718401085,-42.589334781,0.16,0.38,0.08,0.12,0.19,0.25,0.30
2017-03-24 14:41:38,85.797281328,-42.008190191,0.19,0.43,0.09,0.14,0.24,0.31,0.36
2017-03-24 14:43:05,85.875746906,-41.405603354,0.17,0.52,0.09,0.13,0.20,0.28,0.38
2017-03-24 14:44:32,85.953768239,-40.780515771,0.17,0.63,0.07,0.11,0.21,0.33,0.48
2017-03-24 14:45:58,86.031272456,-40.130576661,0.16,0.51,0.05,0.11,0.20,0.29,0.42
2017-03-24 14:47:25,86.108254682,-39.455061507,0.17,0.57,0.10,0.13,0.20,0.27,0.34
2017-03-24 14:48:52,86.184681737,-38.752615761,0.15,0.41,0.10,0.12,0.17,0.24,0.30
2017-03-24 14:50:18,86.260507186,-38.021422578,0.15,0.43,0.08,0.11,0.17,0.24,0.33
2017-03-24 14:51:45,86.33577367,-37.26185411,0.16,0.41,0.10,0.13,0.18,0.26,0.33
2017-03-24 14:53:12,86.410351043,-36.470152141,0.14,0.39,0.08,0.10,0.17,0.23,0.34
2017-03-24 14:54:39,86.484211607,-35.64496644,0.17,0.64,0.09,0.13,0.20,0.30,0.41
2017-03-24 14:56:05,86.557339949,-34.785240161,0.15,0.42,0.07,0.10,0.18,0.26,0.34
2017-03-24 14:57:32,86.629631293,-33.887677944,0.17,0.38,0.08,0.13,0.21,0.27,0.32
2017-03-24 14:58:58,86.701141841,-32.952907095,0.13,0.33,0.06,0.09,0.17,0.23,0.27
2017-03-24 15:00:24,86.771720107,-31.976664769,0.13,0.39,0.07,0.10,0.16,0.24,0.30
2017-03-24 15:01:51,86.841330176,-30.957254406,0.18,0.47,0.09,0.13,0.21,0.30,0.36
2017-03-24 15:03:17,86.909894096,-29.89224059,0.17,0.38,0.09,0.13,0.21,0.26,0.31
2017-03-24 15:04:20,86.9590478628,-29.0914875376,0.16,0.36,0.09,0.13,0.19,0.24,0.33
2017-03-24 15:25:56,86.490354951,-35.579128971,0.18,0.55,0.10,0.14,0.21,0.29,0.36
2017-03-24 15:27:23,86.416512806,-36.406239138,0.15,0.38,0.08,0.11,0.19,0.27,0.32
2017-03-24 15:28:50,86.342027558,-37.201523758,0.16,0.40,0.09,0.12,0.19,0.24,0.29
2017-03-24 15:30:16,86.266855221,-37.964656561,0.16,0.48,0.09,0.11,0.18,0.27,0.38
2017-03-24 15:31:42,86.191063609,-38.697903375,0.16,0.37,0.09,0.12,0.19,0.27,0.31
2017-03-24 15:33:09,86.114641387,-39.401674853,0.16,0.45,0.08,0.11,0.18,0.30,0.36
2017-03-24 15:34:35,86.037673841,-40.078603911,0.14,0.42,0.03,0.09,0.19,0.25,0.32
2017-03-24 15:36:01,85.960300904,-40.732703935,0.16,0.46,0.07,0.11,0.20,0.28,0.36
2017-03-24 15:37:27,85.882231577,-41.357569909,0.17,0.40,0.09,0.13,0.21,0.27,0.32
2017-03-24 15:38:53,85.8038668,-41.963533775,0.18,0.47,0.09,0.13,0.22,0.29,0.34
2017-03-24 15:40:18,85.725010677,-42.546194126,0.15,0.35,0.08,0.12,0.18,0.25,0.31
2017-03-24 15:41:43,85.645743911,-43.10803444,0.15,0.48,0.08,0.11,0.17,0.26,0.38
2017-03-24 15:43:08,85.566080102,-43.649839186,0.14,0.38,0.08,0.10,0.18,0.24,0.30
2017-03-24 15:44:32,85.485977484,-44.171005913,0.19,0.71,0.09,0.15,0.22,0.30,0.49
2017-03-24 15:45:57,85.405625128,-44.676861842,0.22,0.59,0.11,0.17,0.26,0.35,0.45
2017-03-24 15:47:21,85.324956958,-45.165994345,0.20,0.61,0.11,0.15,0.24,0.31,0.39
2017-03-24 15:48:45,85.243858369,-45.635959342,0.23,0.46,0.12,0.17,0.27,0.36,0.40
2017-03-24 15:50:10,85.162479258,-46.090995151,0.19,0.59,0.05,0.13,0.24,0.36,0.50
2017-03-24 15:51:36,85.080893835,-46.53320987,0.19,0.44,0.06,0.14,0.23,0.32,0.38
2017-03-24 15:53:02,84.998949505,-46.958903211,0.19,0.51,0.09,0.13,0.23,0.33,0.40
2017-03-24 15:54:29,84.916723141,-47.370490668,0.21,0.71,0.10,0.15,0.25,0.38,0.57
2017-03-24 15:55:56,84.834382431,-47.77259385,0.24,0.68,0.12,0.17,0.28,0.42,0.57
2017-03-24 15:57:23,84.751732913,-48.160474915,0.21,0.62,0.11,0.15,0.24,0.42,0.51
2017-03-24 15:58:50,84.66884604,-48.536229855,0.22,0.55,0.10,0.16,0.26,0.36,0.43
2017-03-24 16:00:17,84.585803886,-48.902247776,0.22,0.63,0.12,0.16,0.26,0.39,0.53
2017-03-24 16:01:44,84.5027026466,-49.2563628851,0.18,0.55,0.03,0.11,0.25,0.38,0.46
2017-03-24 16:03:11,84.419037838,-49.599517722,0.25,0.56,0.13,0.19,0.30,0.42,0.50
2017-03-24 16:04:37,84.335314833,-49.931729383,0.23,0.59,0.10,0.17,0.29,0.39,0.50
2017-03-24 16:06:02,84.251486571,-50.256446562,0.26,0.79,0.03,0.07,0.40,0.55,0.68
2017-03-24 16:07:28,84.167444585,-50.570989954,0.22,0.59,0.10,0.15,0.26,0.45,0.54
2017-03-24 16:08:53,84.083259783,-50.877282449,0.21,0.62,0.11,0.15,0.26,0.36,0.45
2017-03-24 16:10:17,83.99892903,-51.17549883,0.19,0.52,0.11,0.14,0.22,0.31,0.37
2017-03-24 16:11:42,83.914435872,-51.465267347,0.19,0.64,0.05,0.13,0.25,0.36,0.51
2017-03-24 16:13:05,83.829803499,-51.747440247,0.27,0.65,0.13,0.21,0.31,0.43,0.55
2017-03-24 16:14:25,83.745013057,-52.021660952,0.17,0.55,0.08,0.11,0.21,0.34,0.43
2017-03-24 16:15:47,83.660101334,-52.288976863,0.31,0.77,0.13,0.21,0.38,0.54,0.66
2017-03-24 16:17:09,83.575070353,-52.549616785,0.29,0.84,0.17,0.23,0.34,0.47,0.59
2017-03-24 16:18:31,83.489921756,-52.803671769,0.29,0.73,0.13,0.19,0.37,0.51,0.63
2017-03-24 16:19:54,83.404641987,-53.050964572,0.29,0.63,0.17,0.23,0.33,0.44,0.52
2017-03-24 16:21:16,83.319265075,-53.29264855,0.25,0.68,0.14,0.20,0.29,0.36,0.44
2017-03-24 16:22:39,83.233760579,-53.527911744,0.25,1.03,0.12,0.18,0.29,0.41,0.62
2017-03-24 16:24:01,83.148176981,-53.758045536,0.23,0.65,0.13,0.18,0.26,0.36,0.42
2017-03-24 16:25:23,83.062486124,-53.982579135,0.23,0.60,0.09,0.15,0.30,0.43,0.53
2017-03-24 16:26:45,82.97667082,-54.201125663,0.25,0.61,0.13,0.19,0.30,0.39,0.49
2017-03-24 16:28:06,82.890794847,-54.415404704,0.24,0.75,0.14,0.18,0.28,0.40,0.50
2017-03-24 16:29:28,82.804811374,-54.624334087,0.27,0.58,0.17,0.22,0.31,0.40,0.48
2017-03-24 16:30:49,82.718739516,-54.828448261,0.30,0.52,0.20,0.25,0.34,0.42,0.47
2017-03-24 16:32:11,82.632587123,-55.028035161,0.34,0.75,0.17,0.27,0.41,0.51,0.58
2017-03-24 16:33:32,82.546353082,-55.22315753,0.36,0.95,0.14,0.23,0.48,0.69,0.84
2017-03-24 16:34:54,82.460044941,-55.414098919,0.30,0.64,0.16,0.25,0.35,0.42,0.46
2017-03-24 16:36:15,82.373658931,-55.600868394,0.24,0.65,0.17,0.20,0.27,0.33,0.52
2017-03-24 16:37:07,82.3176507264,-55.7200828311,0.47,1.57,0.17,0.29,0.53,1.02,1.42