# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20170406.10km.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
2017-04-06 10:28:22,80.534219788,29.020504941,0.12,0.30,0.06,0.09,0.14,0.20,0.24
2017-04-06 10:29:36,80.596284742,29.416770527,0.06,0.26,0.03,0.03,0.08,0.14,0.20
2017-04-06 10:30:49,80.6577267624,29.8191644279,0.09,0.38,0.03,0.06,0.12,0.19,0.26
2017-04-06 10:31:46,80.7043679052,30.1276823013,0.08,0.23,0.03,0.03,0.10,0.17,0.21
2017-04-06 10:36:11,80.91809673,31.6158389477,0.08,0.20,0.03,0.04,0.10,0.15,0.17
2017-04-06 10:37:02,80.958311447,31.908965399,0.11,0.27,0.05,0.08,0.13,0.18,0.22
2017-04-06 10:38:19,81.016948195,32.343425991,0.10,0.27,0.06,0.08,0.12,0.16,0.20
2017-04-06 10:39:38,81.075033862,32.783685664,0.11,0.29,0.04,0.09,0.13,0.17,0.21
2017-04-06 10:40:58,81.132606668,33.229581774,0.08,0.24,0.03,0.03,0.11,0.16,0.21
2017-04-06 10:42:19,81.18968588,33.681025897,0.09,0.31,0.03,0.04,0.12,0.18,0.24
2017-04-06 10:43:40,81.246166097,34.138558712,0.09,0.22,0.03,0.07,0.11,0.15,0.19
2017-04-06 10:45:00,81.302109137,34.601846717,0.08,0.23,0.03,0.04,0.12,0.18,0.21
2017-04-06 10:46:21,81.357496407,35.071005233,0.12,0.34,0.04,0.09,0.15,0.20,0.23
2017-04-06 10:47:41,81.412301309,35.546158231,0.12,0.28,0.07,0.09,0.14,0.19,0.22
2017-04-06 10:49:01,81.466519075,36.027338226,0.07,0.21,0.03,0.03,0.09,0.13,0.15
2017-04-06 10:50:20,81.520151727,36.51451144,0.10,0.23,0.05,0.09,0.12,0.16,0.20
2017-04-06 10:51:40,81.573141223,37.007906196,0.07,0.22,0.03,0.03,0.09,0.15,0.18
2017-04-06 10:53:01,81.625532953,37.507399597,0.08,0.24,0.03,0.03,0.12,0.18,0.21
2017-04-06 10:54:23,81.67727631,38.013101113,0.07,0.23,0.03,0.03,0.11,0.16,0.19
2017-04-06 10:55:45,81.728359204,38.525163227,0.08,0.25,0.03,0.04,0.10,0.16,0.18
2017-04-06 10:57:06,81.778795566,39.043481227,0.08,0.24,0.03,0.04,0.10,0.16,0.19
2017-04-06 10:58:24,81.828578061,39.567935686,0.09,0.23,0.03,0.06,0.12,0.15,0.17
2017-04-06 10:59:42,81.877653243,40.098877434,0.09,0.21,0.03,0.06,0.11,0.16,0.19
2017-04-06 11:00:59,81.926045797,40.636141267,0.11,0.31,0.07,0.09,0.13,0.19,0.27
2017-04-06 11:02:15,81.973696067,41.179925493,0.07,0.31,0.03,0.04,0.09,0.15,0.21
2017-04-06 11:03:32,82.020646758,41.730011237,0.09,0.25,0.03,0.06,0.11,0.16,0.19
2017-04-06 11:04:50,82.0669139904,42.2863259503,0.07,0.25,0.03,0.04,0.10,0.15,0.17
2017-04-06 11:06:07,82.112386742,42.849287327,0.05,0.13,0.03,0.04,0.06,0.08,0.10
2017-04-06 11:07:25,82.157092431,43.418684578,0.11,0.27,0.03,0.08,0.14,0.19,0.22
2017-04-06 11:08:28,82.1927452536,43.8837912472,0.11,0.25,0.08,0.10,0.13,0.17,0.20
2017-04-06 11:11:41,82.2980344541,45.3253798908,0.07,0.21,0.04,0.06,0.09,0.12,0.14
2017-04-06 11:12:38,82.32806758,45.760549831,0.09,0.21,0.03,0.07,0.12,0.16,0.18
2017-04-06 11:13:56,82.368790595,46.361941027,0.06,0.17,0.03,0.04,0.08,0.11,0.15
2017-04-06 11:15:15,82.40866912,46.969701263,0.06,0.20,0.03,0.04,0.07,0.11,0.16
2017-04-06 11:16:33,82.447669872,47.583855756,0.05,0.21,0.03,0.03,0.07,0.10,0.13
2017-04-06 11:17:52,82.485830795,48.204119853,0.07,0.21,0.03,0.04,0.09,0.13,0.16
2017-04-06 11:19:10,82.523090391,48.830750262,0.07,0.21,0.04,0.05,0.09,0.13,0.16
2017-04-06 11:20:29,82.559465332,49.463496501,0.08,0.27,0.03,0.05,0.09,0.15,0.20
2017-04-06 11:21:48,82.5949497327,50.102296921,0.11,0.25,0.05,0.08,0.13,0.18,0.22
2017-04-06 11:23:07,82.629529131,50.747061812,0.08,0.30,0.04,0.06,0.09,0.14,0.20
2017-04-06 11:24:26,82.663144859,51.397908688,0.09,0.21,0.05,0.07,0.10,0.14,0.17
2017-04-06 11:25:45,82.695810715,52.054647247,0.07,0.18,0.04,0.05,0.09,0.12,0.14
2017-04-06 11:27:04,82.727570891,52.716995005,0.09,0.21,0.05,0.07,0.10,0.14,0.17
2017-04-06 11:28:23,82.758550646,53.384507294,0.08,0.21,0.04,0.06,0.09,0.12,0.14
2017-04-06 11:29:42,82.788011798,54.059127037,0.10,0.42,0.04,0.07,0.12,0.17,0.27
2017-04-06 11:31:01,82.817101127,54.737481451,0.03,0.12,0.02,0.03,0.03,0.04,0.07
2017-04-06 11:32:20,82.844712719,55.422457451,0.04,0.14,0.02,0.03,0.05,0.09,0.13
2017-04-06 11:33:38,82.871321101,56.11256442,0.07,0.22,0.03,0.05,0.09,0.12,0.15
2017-04-06 11:34:57,82.8970440726,56.8073766824,0.07,0.25,0.03,0.05,0.09,0.12,0.15
2017-04-06 11:36:16,82.921764351,57.507018377,0.09,0.21,0.05,0.07,0.11,0.14,0.16
2017-04-06 11:37:35,82.945400962,58.211478025,0.08,0.21,0.03,0.07,0.09,0.14,0.19
2017-04-06 11:38:53,82.9662722627,58.9167657719,0.08,0.27,0.04,0.06,0.09,0.13,0.21
2017-04-06 11:41:34,82.979359144,60.402323876,0.07,0.21,0.03,0.05,0.08,0.11,0.14
2017-04-06 11:42:53,82.960346448,61.120109413,0.09,0.26,0.03,0.07,0.11,0.16,0.20
2017-04-06 11:44:11,82.9374129,61.827742564,0.07,0.15,0.04,0.05,0.08,0.11,0.14
2017-04-06 11:45:29,82.9133843533,62.5305652079,0.06,0.24,0.03,0.04,0.09,0.12,0.16
2017-04-06 11:46:47,82.887251283,63.225907708,0.07,0.26,0.06,0.06,0.08,0.11,0.17
2017-04-06 11:48:05,82.859957812,63.915704295,0.07,0.20,0.05,0.06,0.08,0.12,0.15
2017-04-06 11:49:23,82.83128596,64.59930968,0.08,0.21,0.05,0.06,0.10,0.14,0.17
2017-04-06 11:50:41,82.801776503,65.277847511,0.09,0.26,0.05,0.07,0.10,0.15,0.18
2017-04-06 11:51:58,82.771234987,65.950654362,0.08,0.21,0.05,0.06,0.08,0.12,0.15
2017-04-06 11:53:16,82.740136812,66.618897441,0.07,0.14,0.06,0.06,0.07,0.10,0.12
2017-04-06 11:54:34,82.707426159,67.279377147,0.06,0.17,0.03,0.06,0.07,0.10,0.15
2017-04-06 11:55:52,82.67508462,67.937970346,0.08,0.17,0.05,0.06,0.09,0.13,0.15
2017-04-06 11:57:09,82.639554616,68.583183128,0.08,0.17,0.04,0.06,0.09,0.12,0.15
2017-04-06 11:58:27,82.60442991,69.226941678,0.08,0.29,0.05,0.06,0.09,0.12,0.15
2017-04-06 11:59:45,82.56828174,69.864324588,0.07,0.17,0.03,0.05,0.08,0.11,0.13
2017-04-06 12:01:03,82.531241561,70.495485864,0.05,0.16,0.03,0.03,0.07,0.11,0.13
2017-04-06 12:02:21,82.493307149,71.120345324,0.06,0.15,0.03,0.05,0.08,0.11,0.13
2017-04-06 12:03:40,82.454468754,71.738749413,0.08,0.25,0.04,0.06,0.09,0.14,0.19
2017-04-06 12:04:58,82.414784466,72.350851286,0.08,0.21,0.05,0.06,0.10,0.13,0.16
2017-04-06 12:06:16,82.374271358,72.956652704,0.07,0.18,0.04,0.06,0.08,0.11,0.14
2017-04-06 12:07:34,82.332887319,73.555907069,0.07,0.18,0.04,0.06,0.08,0.12,0.14
2017-04-06 12:08:53,82.290669969,74.148623847,0.04,0.13,0.03,0.03,0.05,0.08,0.10
2017-04-06 12:10:11,82.247744463,74.735289626,0.06,0.21,0.03,0.03,0.07,0.12,0.17
2017-04-06 12:11:29,82.203941757,75.315156393,0.07,0.21,0.03,0.04,0.09,0.13,0.18
2017-04-06 12:12:47,82.1593820168,75.8884876672,0.06,0.19,0.03,0.03,0.07,0.11,0.14
2017-04-06 12:14:05,82.114034691,76.455278599,0.07,0.20,0.04,0.05,0.08,0.12,0.16
2017-04-06 12:15:23,82.067968683,77.015734412,0.07,0.19,0.04,0.05,0.08,0.12,0.15
2017-04-06 12:16:41,82.021140497,77.569587038,0.08,0.21,0.04,0.05,0.09,0.13,0.17
2017-04-06 12:17:58,81.973552354,78.116872062,0.07,0.16,0.04,0.05,0.08,0.12,0.14
2017-04-06 12:19:15,81.925313157,78.658003523,0.06,0.15,0.03,0.05,0.08,0.11,0.12
2017-04-06 12:20:33,81.8763216406,79.1925066985,0.06,0.21,0.03,0.04,0.07,0.13,0.17
2017-04-06 12:21:15,81.8487437429,79.4841447333,0.07,0.12,0.05,0.06,0.09,0.11,0.12
2017-04-06 12:24:39,81.8857626283,80.9813724679,0.06,0.16,0.03,0.04,0.07,0.11,0.13
2017-04-06 12:25:58,81.932119496,81.527899079,0.06,0.18,0.03,0.04,0.07,0.10,0.14
2017-04-06 12:27:17,81.9775184052,82.08174589,0.07,0.21,0.04,0.05,0.08,0.12,0.15
2017-04-06 12:28:36,82.022248622,82.64145673,0.07,0.19,0.04,0.05,0.08,0.11,0.13
2017-04-06 12:29:55,82.066218424,83.207406196,0.07,0.17,0.04,0.05,0.09,0.12,0.14
2017-04-06 12:31:14,82.109385784,83.779716471,0.07,0.19,0.03,0.05,0.09,0.14,0.17
2017-04-06 12:32:33,82.151808985,84.358043516,0.08,0.22,0.04,0.06,0.10,0.13,0.17
2017-04-06 12:33:52,82.193400619,84.942706376,0.09,0.41,0.04,0.06,0.11,0.17,0.23
2017-04-06 12:35:11,82.234216399,85.533409727,0.08,0.23,0.03,0.05,0.09,0.14,0.19
2017-04-06 12:36:30,82.274186785,86.130302835,0.04,0.15,0.02,0.03,0.05,0.09,0.12
2017-04-06 12:37:49,82.3133670033,86.7344832451,0.06,0.30,0.03,0.03,0.08,0.12,0.16
2017-04-06 12:39:08,82.351589326,87.342408662,0.06,0.17,0.03,0.04,0.06,0.12,0.15
2017-04-06 12:40:26,82.3890111903,87.9574654339,0.06,0.24,0.02,0.04,0.07,0.11,0.16
2017-04-06 12:41:45,82.425562194,88.578514707,0.06,0.19,0.04,0.05,0.07,0.11,0.16
2017-04-06 12:43:03,82.461227568,89.205477066,0.06,0.14,0.04,0.05,0.08,0.10,0.12
2017-04-06 12:44:21,82.4959443489,89.8384304856,0.05,0.14,0.03,0.04,0.06,0.08,0.11
2017-04-06 12:45:39,82.529816089,90.476953574,0.06,0.18,0.03,0.05,0.08,0.12,0.15
2017-04-06 12:46:57,82.562708207,91.121358838,0.06,0.17,0.04,0.05,0.08,0.11,0.13
2017-04-06 12:48:16,82.594688634,91.771312596,0.07,0.17,0.03,0.06,0.09,0.12,0.14
2017-04-06 12:49:34,82.625701598,92.426811614,0.08,0.18,0.05,0.06,0.09,0.12,0.14
2017-04-06 12:50:51,82.655774533,93.087667438,0.08,0.26,0.03,0.06,0.10,0.12,0.18
2017-04-06 12:52:09,82.684891616,93.753786907,0.07,0.17,0.04,0.06,0.09,0.12,0.14
2017-04-06 12:53:27,82.712993966,94.42518843,0.08,0.15,0.05,0.06,0.09,0.12,0.14
2017-04-06 12:54:45,82.740102861,95.1016416,0.08,0.22,0.05,0.06,0.09,0.13,0.16
2017-04-06 12:56:04,82.766191947,95.783096389,0.09,0.20,0.05,0.07,0.11,0.15,0.17
2017-04-06 12:57:22,82.791268627,96.469349944,0.10,0.21,0.05,0.07,0.13,0.16,0.19
2017-04-06 12:58:40,82.815288659,97.160304122,0.09,0.22,0.03,0.06,0.12,0.17,0.20
2017-04-06 12:59:58,82.838302114,97.855689295,0.10,0.23,0.06,0.08,0.12,0.16,0.19
2017-04-06 13:01:16,82.860297493,98.555352764,0.07,0.22,0.02,0.04,0.09,0.13,0.16
2017-04-06 13:02:34,82.881199953,99.259287383,0.10,0.20,0.05,0.07,0.12,0.15,0.17
2017-04-06 13:03:52,82.901026293,99.967263868,0.08,0.20,0.02,0.05,0.10,0.14,0.17
2017-04-06 13:05:10,82.919779552,100.679041856,0.09,0.32,0.02,0.06,0.11,0.17,0.27
2017-04-06 13:06:28,82.937438427,101.394466112,0.08,0.21,0.03,0.06,0.09,0.14,0.18
2017-04-06 13:07:45,82.953978197,102.113434916,0.10,0.26,0.03,0.07,0.12,0.17,0.21
2017-04-06 13:09:03,82.9694125138,102.835659718,0.09,0.24,0.02,0.05,0.11,0.17,0.21
2017-04-06 13:10:21,82.983786562,103.560877368,0.09,0.24,0.04,0.06,0.11,0.15,0.19
2017-04-06 13:11:39,82.997046913,104.28888055,0.09,0.29,0.04,0.07,0.11,0.16,0.21
2017-04-06 13:12:56,83.009189032,105.019558178,0.09,0.29,0.03,0.06,0.11,0.17,0.20
2017-04-06 13:14:14,83.020112934,105.752721951,0.09,0.21,0.04,0.06,0.11,0.15,0.18
2017-04-06 13:15:31,83.029938867,106.488025974,0.09,0.25,0.06,0.07,0.10,0.15,0.17
2017-04-06 13:16:49,83.038639013,107.225258213,0.09,0.23,0.04,0.06,0.10,0.15,0.18
2017-04-06 13:18:06,83.046227666,107.964174188,0.08,0.24,0.05,0.06,0.10,0.14,0.18
2017-04-06 13:19:23,83.05266769,108.704591257,0.10,0.26,0.05,0.07,0.12,0.17,0.21
2017-04-06 13:20:40,83.057928051,109.446280374,0.09,0.25,0.03,0.06,0.11,0.15,0.19
2017-04-06 13:21:57,83.062004211,110.188960687,0.08,0.21,0.05,0.06,0.09,0.13,0.17
2017-04-06 13:23:13,83.064941243,110.932349037,0.09,0.21,0.05,0.07,0.11,0.15,0.18
2017-04-06 13:24:30,83.066740898,111.676271992,0.08,0.19,0.06,0.07,0.10,0.13,0.16
2017-04-06 13:25:46,83.067424721,112.420460201,0.10,0.27,0.05,0.06,0.12,0.19,0.24
2017-04-06 13:27:02,83.066907557,113.164671995,0.08,0.25,0.02,0.06,0.11,0.15,0.18
2017-04-06 13:28:17,83.065180029,113.90863416,0.09,0.26,0.05,0.07,0.11,0.15,0.21
2017-04-06 13:29:33,83.062368918,114.652117712,0.10,0.34,0.04,0.07,0.13,0.18,0.22
2017-04-06 13:30:48,83.058427453,115.394888467,0.09,0.39,0.04,0.07,0.10,0.15,0.21
2017-04-06 13:32:04,83.053229182,116.136645716,0.08,0.31,0.02,0.05,0.10,0.17,0.26
2017-04-06 13:33:19,83.0469414,116.877224595,0.10,0.37,0.06,0.07,0.12,0.17,0.25
2017-04-06 13:34:27,83.0402892991,117.545879815,0.14,3.71,0.05,0.08,0.12,0.17,1.75
2017-04-06 13:38:38,83.202810377,119.112561743,0.10,0.35,0.05,0.07,0.12,0.18,0.27
2017-04-06 13:39:55,83.288123557,119.351930055,0.10,0.29,0.05,0.07,0.12,0.17,0.23
2017-04-06 13:41:11,83.373574235,119.590647529,0.08,0.19,0.05,0.07,0.10,0.13,0.15
2017-04-06 13:42:28,83.458955761,119.834224156,0.09,0.27,0.02,0.06,0.11,0.17,0.22
2017-04-06 13:43:44,83.544249643,120.08329822,0.09,0.25,0.03,0.07,0.12,0.16,0.19
2017-04-06 13:45:00,83.629445552,120.338299099,0.11,0.34,0.05,0.08,0.15,0.20,0.25
2017-04-06 13:46:17,83.71449875,120.600575074,0.09,0.25,0.03,0.06,0.11,0.18,0.22
2017-04-06 13:47:33,83.79943862,120.869422693,0.10,0.39,0.04,0.07,0.12,0.18,0.24
2017-04-06 13:48:49,83.884227436,121.146040928,0.10,0.31,0.06,0.07,0.13,0.18,0.25
2017-04-06 13:50:05,83.968861161,121.430714153,0.09,0.34,0.03,0.07,0.10,0.15,0.22
2017-04-06 13:51:21,84.053381982,121.722175191,0.10,0.25,0.06,0.07,0.11,0.18,0.23
2017-04-06 13:52:38,84.137762585,122.02176919,0.11,0.30,0.05,0.08,0.13,0.18,0.24
2017-04-06 13:53:55,84.221966224,122.330392107,0.10,0.22,0.06,0.07,0.12,0.18,0.21
2017-04-06 13:55:12,84.305981546,122.648402766,0.11,0.33,0.06,0.08,0.13,0.19,0.25
2017-04-06 13:56:28,84.389835261,122.975623562,0.11,0.30,0.03,0.08,0.14,0.20,0.24
2017-04-06 13:57:45,84.473515975,123.312190211,0.13,0.31,0.06,0.10,0.16,0.22,0.26
2017-04-06 13:59:02,84.557053713,123.657803205,0.11,0.29,0.06,0.08,0.13,0.19,0.23
2017-04-06 14:00:18,84.640353093,124.015042217,0.11,0.27,0.05,0.08,0.13,0.18,0.23
2017-04-06 14:01:35,84.723449279,124.383236481,0.12,0.30,0.07,0.09,0.14,0.20,0.24
2017-04-06 14:02:52,84.806309364,124.763534515,0.10,0.27,0.05,0.07,0.13,0.18,0.23
2017-04-06 14:03:53,84.8724556106,125.076986932,0.12,0.27,0.07,0.09,0.14,0.19,0.25