# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20170419.10km.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
2017-04-19 12:15:57,80.54727094,-96.758564324,0.17,0.62,0.04,0.10,0.23,0.36,0.44
2017-04-19 12:17:24,80.577986984,-97.27337666,0.26,0.56,0.09,0.19,0.32,0.43,0.52
2017-04-19 12:18:48,80.607931236,-97.791526013,0.33,1.02,0.13,0.24,0.39,0.61,0.81
2017-04-19 12:20:11,80.637140224,-98.312887867,0.33,0.91,0.12,0.24,0.41,0.58,0.70
2017-04-19 12:21:33,80.665442452,-98.83769026,0.23,0.90,0.09,0.13,0.30,0.52,0.74
2017-04-19 12:22:55,80.69316338,-99.3652841828,0.22,0.76,0.09,0.14,0.29,0.42,0.53
2017-04-19 12:24:14,80.7177221454,-99.8505907152,0.13,0.34,0.09,0.10,0.14,0.20,0.29
2017-04-19 12:25:50,80.7467659425,-100.441186016,0.17,0.87,0.07,0.10,0.22,0.36,0.50
2017-04-19 12:27:16,80.771582224,-100.966312179,0.16,0.60,0.07,0.09,0.20,0.33,0.55
2017-04-19 12:28:41,80.796102166,-101.505899436,0.22,0.62,0.09,0.15,0.27,0.40,0.50
2017-04-19 12:30:05,80.819823675,-102.048286858,0.13,0.69,0.07,0.08,0.15,0.26,0.39
2017-04-19 12:31:29,80.84274321,-102.593389135,0.19,0.69,0.04,0.11,0.27,0.38,0.45
2017-04-19 12:32:53,80.864829621,-103.141176058,0.18,0.57,0.07,0.10,0.25,0.39,0.48
2017-04-19 12:34:14,80.886109666,-103.691526269,0.17,0.46,0.08,0.11,0.21,0.32,0.41
2017-04-19 12:35:37,80.906538471,-104.244398394,0.15,0.66,0.04,0.08,0.18,0.35,0.46
2017-04-19 12:37:03,80.92615632,-104.799663374,0.20,0.75,0.09,0.13,0.25,0.37,0.49
2017-04-19 12:38:29,80.944917906,-105.357282207,0.17,0.67,0.07,0.10,0.21,0.37,0.48
2017-04-19 12:39:52,80.962848104,-105.917126621,0.19,0.46,0.09,0.13,0.23,0.33,0.43
2017-04-19 12:41:14,80.979908825,-106.479154454,0.16,0.58,0.07,0.10,0.20,0.30,0.44
2017-04-19 12:42:35,80.996119716,-107.043245192,0.22,0.58,0.11,0.16,0.26,0.34,0.43
2017-04-19 12:44:02,81.011489627,-107.609249242,0.17,0.53,0.09,0.13,0.20,0.30,0.42
2017-04-19 12:45:27,81.025985923,-108.177147523,0.22,0.67,0.11,0.15,0.27,0.37,0.42
2017-04-19 12:46:50,81.039573332,-108.74683772,0.21,0.60,0.11,0.16,0.24,0.33,0.45
2017-04-19 12:48:14,81.052277159,-109.318182406,0.20,0.48,0.11,0.15,0.23,0.31,0.40
2017-04-19 12:49:40,81.06418102,-109.891028125,0.16,0.60,0.09,0.12,0.19,0.29,0.44
2017-04-19 12:51:06,81.075165692,-110.465377671,0.20,0.57,0.11,0.16,0.24,0.31,0.42
2017-04-19 12:52:32,81.085233649,-111.041056628,0.19,0.56,0.10,0.14,0.22,0.33,0.45
2017-04-19 12:53:58,81.094426184,-111.61800089,0.21,0.57,0.10,0.14,0.25,0.37,0.47
2017-04-19 12:55:22,81.102754483,-112.196050188,0.16,0.47,0.09,0.11,0.19,0.28,0.34
2017-04-19 12:56:47,81.110181577,-112.775119049,0.18,0.42,0.08,0.13,0.22,0.30,0.38
2017-04-19 12:58:11,81.11670805,-113.355104833,0.18,0.51,0.10,0.14,0.21,0.30,0.39
2017-04-19 12:59:37,81.122322834,-113.935892983,0.16,0.39,0.08,0.12,0.19,0.26,0.32
2017-04-19 13:01:02,81.127068609,-114.517309864,0.18,0.45,0.10,0.14,0.22,0.28,0.34
2017-04-19 13:02:27,81.130891645,-115.099318203,0.16,0.40,0.07,0.11,0.20,0.29,0.35
2017-04-19 13:03:52,81.133830358,-115.681761215,0.19,0.59,0.10,0.14,0.23,0.36,0.44
2017-04-19 13:05:16,81.135849824,-116.264523139,0.19,0.68,0.10,0.13,0.23,0.31,0.37
2017-04-19 13:06:41,81.136972559,-116.847486827,0.17,0.63,0.08,0.11,0.20,0.30,0.38
2017-04-19 13:08:06,81.137184721,-117.430546036,0.16,0.57,0.09,0.13,0.19,0.24,0.29
2017-04-19 13:09:31,81.136519565,-118.013559843,0.19,0.46,0.10,0.15,0.23,0.32,0.38
2017-04-19 13:10:57,81.134922056,-118.596435299,0.17,0.39,0.09,0.13,0.21,0.29,0.35
2017-04-19 13:12:18,81.1325728,-119.149919763,0.20,0.48,0.11,0.15,0.24,0.31,0.38
2017-04-19 13:37:29,80.9355050672,-129.491404232,0.14,0.47,0.07,0.10,0.16,0.28,0.37
2017-04-19 13:38:53,80.916416839,-130.047128472,0.15,0.43,0.08,0.10,0.17,0.26,0.38
2017-04-19 13:40:16,80.896248062,-130.601004838,0.11,0.36,0.04,0.07,0.14,0.21,0.26
2017-04-19 13:41:40,80.875371096,-131.152602244,0.13,0.50,0.07,0.09,0.16,0.24,0.33
2017-04-19 13:43:05,80.853673573,-131.701646627,0.13,0.36,0.07,0.09,0.15,0.22,0.29
2017-04-19 13:44:30,80.831164767,-132.248072286,0.14,0.60,0.07,0.09,0.17,0.24,0.34
2017-04-19 13:45:55,80.807831873,-132.791788058,0.13,0.34,0.06,0.10,0.16,0.23,0.27
2017-04-19 13:47:20,80.78370125,-133.33275105,0.14,0.45,0.07,0.11,0.17,0.23,0.31
2017-04-19 13:48:45,80.758759947,-133.870842845,0.15,0.55,0.07,0.11,0.17,0.24,0.33
2017-04-19 13:50:10,80.733013545,-134.406014378,0.11,0.35,0.03,0.08,0.15,0.22,0.28
2017-04-19 13:51:35,80.706489484,-134.938215728,0.13,0.42,0.07,0.09,0.16,0.24,0.30
2017-04-19 13:53:00,80.679172501,-135.467360902,0.13,0.31,0.06,0.09,0.15,0.21,0.27
2017-04-19 13:54:25,80.651083054,-135.993418671,0.12,0.43,0.06,0.09,0.14,0.20,0.27
2017-04-19 13:55:50,80.62223899,-136.516337147,0.13,0.46,0.07,0.10,0.16,0.22,0.29
2017-04-19 13:57:16,80.592603028,-137.035969336,0.14,0.43,0.07,0.10,0.16,0.27,0.37
2017-04-19 13:58:40,80.5622484417,-137.552406416,0.13,0.38,0.07,0.10,0.16,0.22,0.28
2017-04-19 14:00:04,80.531129721,-138.06547291,0.12,0.36,0.06,0.08,0.14,0.20,0.27
2017-04-19 14:01:27,80.4992478,-138.575119275,0.12,0.36,0.06,0.08,0.15,0.24,0.30
2017-04-19 14:02:51,80.466649231,-139.081394151,0.14,0.39,0.07,0.10,0.17,0.25,0.34
2017-04-19 14:04:14,80.43332592,-139.584213834,0.15,0.42,0.06,0.10,0.18,0.28,0.37
2017-04-19 14:05:38,80.399281773,-140.083539262,0.16,0.52,0.06,0.11,0.21,0.29,0.36
2017-04-19 14:07:02,80.36452706,-140.579335131,0.12,0.53,0.06,0.09,0.14,0.20,0.30
2017-04-19 14:08:26,80.329079976,-141.071578784,0.16,0.65,0.08,0.11,0.20,0.30,0.40
2017-04-19 14:09:51,80.2929339447,-141.560214618,0.14,0.38,0.08,0.10,0.17,0.26,0.33
2017-04-19 14:11:16,80.256076378,-142.045172792,0.16,0.50,0.08,0.11,0.19,0.26,0.36
2017-04-19 14:12:41,80.218564335,-142.526536778,0.13,0.42,0.06,0.09,0.16,0.22,0.30
2017-04-19 14:14:05,80.180397374,-143.004260612,0.12,0.26,0.07,0.09,0.15,0.20,0.23
2017-04-19 14:15:30,80.141536147,-143.478216558,0.15,0.59,0.06,0.10,0.19,0.30,0.46
2017-04-19 14:16:55,80.102015654,-143.94846726,0.14,0.42,0.07,0.10,0.18,0.26,0.33
2017-04-19 14:18:21,80.061859015,-144.415012625,0.11,0.35,0.06,0.08,0.13,0.19,0.23
2017-04-19 14:19:46,80.021071308,-144.877842103,0.13,0.41,0.07,0.10,0.16,0.22,0.30
2017-04-19 14:21:11,79.979632389,-145.336853126,0.14,0.46,0.07,0.10,0.17,0.24,0.32
2017-04-19 14:22:36,79.937567451,-145.792079392,0.12,0.44,0.06,0.09,0.14,0.26,0.35
2017-04-19 14:23:59,79.894898197,-146.243572833,0.12,0.39,0.07,0.09,0.13,0.20,0.27
2017-04-19 14:25:20,79.851614254,-146.691271354,0.12,0.34,0.06,0.08,0.14,0.21,0.27
2017-04-19 14:26:42,79.807730707,-147.135182395,0.12,0.39,0.05,0.08,0.15,0.23,0.32
2017-04-19 14:28:03,79.763258147,-147.575313893,0.11,0.37,0.04,0.08,0.14,0.21,0.26
2017-04-19 14:29:25,79.718186722,-148.011631848,0.11,0.35,0.06,0.08,0.12,0.19,0.24
2017-04-19 14:30:46,79.672525741,-148.444123005,0.14,0.36,0.07,0.10,0.17,0.23,0.28
2017-04-19 14:31:51,79.6363127902,-148.781703575,0.11,0.27,0.06,0.08,0.13,0.20,0.24
2017-04-19 14:36:43,79.473397505,-148.685856716,0.10,0.34,0.05,0.08,0.11,0.16,0.23
2017-04-19 14:37:59,79.462212362,-148.198202609,0.12,0.26,0.07,0.09,0.14,0.20,0.22
2017-04-19 14:39:16,79.450273797,-147.711633012,0.10,0.23,0.06,0.08,0.12,0.16,0.19
2017-04-19 14:40:34,79.437568342,-147.226202243,0.12,0.40,0.06,0.09,0.14,0.24,0.33
2017-04-19 14:41:51,79.4241046171,-146.741989596,0.11,0.47,0.04,0.07,0.14,0.23,0.33
2017-04-19 14:43:08,79.4099156561,-146.2590187,0.13,0.37,0.04,0.10,0.17,0.24,0.33
2017-04-19 14:44:26,79.395018981,-145.777320179,0.12,0.31,0.06,0.09,0.15,0.21,0.25
2017-04-19 14:45:43,79.379351412,-145.297037627,0.14,0.48,0.07,0.10,0.17,0.25,0.34
2017-04-19 14:47:01,79.362977598,-144.818161852,0.13,0.52,0.07,0.10,0.15,0.22,0.28
2017-04-19 14:48:18,79.3459120049,-144.340738603,0.14,0.40,0.07,0.09,0.18,0.29,0.33
2017-04-19 14:49:36,79.328071111,-143.864924457,0.15,0.57,0.06,0.10,0.19,0.27,0.42
2017-04-19 14:50:54,79.3095273906,-143.390702993,0.13,0.46,0.07,0.09,0.15,0.23,0.36
2017-04-19 14:52:12,79.290191345,-142.918223508,0.13,0.28,0.05,0.09,0.16,0.23,0.26
2017-04-19 14:53:30,79.2703031291,-142.447254725,0.11,0.40,0.06,0.09,0.13,0.20,0.23
2017-04-19 14:54:48,79.2496660369,-141.978070568,0.11,0.31,0.03,0.08,0.13,0.18,0.25
2017-04-19 14:56:06,79.228313341,-141.510716658,0.14,0.41,0.07,0.10,0.16,0.24,0.31
2017-04-19 14:57:24,79.206239141,-141.04527121,0.13,0.45,0.07,0.09,0.15,0.23,0.31
2017-04-19 14:58:43,79.183467407,-140.581744159,0.12,0.28,0.07,0.10,0.15,0.19,0.23
2017-04-19 15:00:01,79.160002961,-140.120172673,0.13,0.34,0.07,0.10,0.15,0.22,0.27
2017-04-19 15:01:19,79.13592287,-139.660501634,0.10,0.30,0.04,0.07,0.13,0.18,0.21
2017-04-19 15:02:37,79.111112829,-139.202951625,0.13,0.39,0.07,0.09,0.15,0.23,0.29
2017-04-19 15:03:55,79.085619812,-138.747491822,0.12,0.33,0.06,0.09,0.14,0.20,0.27
2017-04-19 15:05:13,79.059471609,-138.294137907,0.14,0.45,0.08,0.10,0.16,0.22,0.28
2017-04-19 15:06:31,79.032634862,-137.842974535,0.16,0.61,0.07,0.11,0.20,0.29,0.36
2017-04-19 15:07:50,79.0051563306,-137.393981523,0.15,0.39,0.07,0.10,0.18,0.29,0.33
2017-04-19 15:09:08,78.9770359888,-136.947208229,0.18,0.45,0.08,0.12,0.22,0.34,0.39
2017-04-19 15:10:24,78.9482598843,-136.502713716,0.16,0.54,0.07,0.10,0.20,0.33,0.42
2017-04-19 15:11:40,78.9188602874,-136.060492218,0.13,0.31,0.07,0.09,0.15,0.21,0.26
2017-04-19 15:12:56,78.888768393,-135.620691892,0.12,0.56,0.06,0.08,0.14,0.22,0.34
2017-04-19 15:14:11,78.858076458,-135.183197787,0.12,0.28,0.06,0.08,0.14,0.21,0.24
2017-04-19 15:15:27,78.826753601,-134.748102896,0.12,0.43,0.07,0.09,0.15,0.19,0.26
2017-04-19 15:16:42,78.7947925167,-134.31546498,0.16,0.46,0.04,0.11,0.19,0.30,0.39
2017-04-19 15:17:58,78.7621939741,-133.885321038,0.10,0.40,0.03,0.03,0.15,0.23,0.29
2017-04-19 15:19:13,78.729013179,-133.457591525,0.21,0.63,0.09,0.14,0.25,0.40,0.52
2017-04-19 15:20:28,78.695213326,-133.032381028,0.13,0.37,0.06,0.10,0.16,0.22,0.26
2017-04-19 15:21:43,78.660781076,-132.609749665,0.12,1.03,0.06,0.08,0.13,0.23,0.76
2017-04-19 15:22:58,78.625832834,-132.1894807,0.13,0.38,0.07,0.09,0.17,0.24,0.30
2017-04-19 15:24:13,78.590204511,-131.771994183,0.14,0.42,0.06,0.09,0.18,0.26,0.34
2017-04-19 15:25:28,78.554012579,-131.357028266,0.12,0.37,0.06,0.08,0.15,0.22,0.30
2017-04-19 15:26:43,78.51726469,-130.944612552,0.11,0.29,0.05,0.07,0.13,0.19,0.25
2017-04-19 15:27:58,78.479936312,-130.534827342,0.13,0.34,0.06,0.10,0.16,0.22,0.29
2017-04-19 15:29:13,78.442062598,-130.127612341,0.16,0.47,0.08,0.12,0.20,0.28,0.35
2017-04-19 15:30:29,78.403562239,-129.723187993,0.17,0.64,0.04,0.08,0.22,0.37,0.54
2017-04-19 15:31:44,78.36454718,-129.321321325,0.12,0.33,0.03,0.09,0.14,0.21,0.25
2017-04-19 15:33:00,78.324983162,-128.922108075,0.13,0.37,0.06,0.09,0.16,0.22,0.30
2017-04-19 15:34:16,78.28482358,-128.525690169,0.15,0.77,0.06,0.09,0.17,0.34,0.64
2017-04-19 15:35:33,78.244183196,-128.131822345,0.14,0.65,0.06,0.08,0.16,0.30,0.48
2017-04-19 15:36:50,78.202999744,-127.740666816,0.14,0.47,0.08,0.10,0.17,0.24,0.30
2017-04-19 15:38:06,78.161223994,-127.352348473,0.11,0.42,0.06,0.08,0.13,0.21,0.31
2017-04-19 15:39:23,78.118952381,-126.966676639,0.15,0.46,0.07,0.11,0.18,0.27,0.36
2017-04-19 15:40:40,78.076187035,-126.58364044,0.13,0.52,0.07,0.09,0.16,0.23,0.32
2017-04-19 15:41:57,78.032914865,-126.203303419,0.11,0.33,0.06,0.08,0.14,0.21,0.26
2017-04-19 15:42:57,77.9984291827,-125.905309062,0.14,0.43,0.06,0.09,0.18,0.25,0.36
2017-04-19 15:44:56,77.9298543642,-125.32712203,0.22,0.87,0.11,0.15,0.28,0.42,0.59
2017-04-19 15:45:47,77.899998812,-125.078803061,0.17,0.44,0.08,0.13,0.20,0.28,0.37
2017-04-19 15:47:03,77.854715701,-124.709382393,0.16,0.47,0.08,0.11,0.18,0.28,0.36
2017-04-19 15:48:19,77.808896206,-124.342805268,0.18,0.61,0.09,0.13,0.22,0.31,0.46
2017-04-19 15:49:35,77.762666639,-123.978759174,0.21,0.97,0.08,0.13,0.22,0.52,0.79
2017-04-19 15:50:51,77.715948831,-123.617451581,0.20,0.67,0.10,0.15,0.24,0.31,0.38
2017-04-19 15:52:06,77.668715419,-123.258981572,0.18,0.82,0.07,0.11,0.22,0.39,0.59
2017-04-19 15:53:21,77.621026642,-122.903195478,0.22,0.59,0.10,0.15,0.28,0.40,0.49
2017-04-19 15:54:37,77.572923609,-122.549973148,0.23,0.70,0.12,0.17,0.28,0.38,0.48
2017-04-19 15:55:54,77.524309907,-122.19961564,0.24,0.74,0.07,0.16,0.30,0.51,0.61
2017-04-19 15:57:12,77.47529619,-121.851803083,0.25,0.61,0.14,0.19,0.30,0.42,0.50
2017-04-19 15:58:31,77.425809541,-121.50675074,0.26,0.57,0.12,0.19,0.31,0.42,0.51
2017-04-19 15:59:54,77.375907201,-121.164300789,0.22,0.70,0.08,0.14,0.28,0.40,0.54
2017-04-19 16:01:08,77.3316397671,-120.865109709,0.20,0.55,0.08,0.13,0.25,0.34,0.45