# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20120410.10km.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 2012-04-10 12:48:06,70.3549629777,-20.5856540313,nan,nan,nan,nan,nan,nan,nan 2012-04-10 12:49:40,70.4431907218,-20.5324982896,nan,nan,nan,nan,nan,nan,nan 2012-04-10 12:51:16,70.5349620453,-20.4804002111,nan,nan,nan,nan,nan,nan,nan 2012-04-10 12:52:50,70.6247782622,-20.4295773207,nan,nan,nan,nan,nan,nan,nan 2012-04-10 12:54:22,70.7130175405,-20.3787990863,nan,nan,nan,nan,nan,nan,nan 2012-04-10 12:55:53,70.8012506503,-20.3276149724,nan,nan,nan,nan,nan,nan,nan 2012-04-10 12:57:23,70.889477965,-20.276111961,nan,nan,nan,nan,nan,nan,nan 2012-04-10 12:58:49,70.9777182587,-20.2239952736,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:00:14,71.0660904626,-20.171377236,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:01:37,71.154314628,-20.118290582,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:03:00,71.242487122,-20.064974218,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:04:21,71.330626775,-20.010899655,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:05:43,71.418765639,-19.956559909,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:07:04,71.506867379,-19.901371571,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:08:25,71.59496279,-19.845836484,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:09:46,71.68304097,-19.7897744085,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:11:08,71.771105726,-19.733247218,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:12:39,71.859154374,-19.676194476,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:14:13,71.947193733,-19.618715444,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:15:48,72.035198502,-19.560420032,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:17:23,72.123205389,-19.501884615,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:18:57,72.2111718137,-19.4424209593,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:20:32,72.2991260538,-19.3824744186,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:22:07,72.387086642,-19.322348253,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:23:41,72.475008611,-19.261319497,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:25:16,72.562913026,-19.199728478,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:26:50,72.650803265,-19.137591746,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:28:24,72.738664502,-19.074691863,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:29:58,72.826524417,-19.011460676,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:31:32,72.914333859,-18.947128152,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:33:06,73.002159313,-18.88271011,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:34:39,73.0899221923,-18.8169811942,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:36:13,73.177693318,-18.751052891,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:37:45,73.2654412359,-18.6844311341,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:39:18,73.353162559,-18.617037154,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:40:50,73.440863532,-18.54897601,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:42:21,73.528542854,-18.480224023,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:43:52,73.616200837,-18.410787184,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:45:23,73.703832594,-18.340562785,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:46:55,73.791443507,-18.269637353,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:48:26,73.879020441,-18.197803479,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:49:57,73.966580953,-18.125337972,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:51:27,74.054119786,-18.052134502,nan,nan,nan,nan,nan,nan,nan 2012-04-10 13:52:58,74.141628432,-17.978058728,0.05,0.10,0.02,0.03,0.06,0.09,0.10 2012-04-10 13:54:29,74.22911577,-17.903251354,0.04,0.13,0.02,0.02,0.05,0.08,0.10 2012-04-10 13:56:00,74.3165744254,-17.8275900524,0.09,0.18,0.04,0.07,0.11,0.14,0.16 2012-04-10 13:57:31,74.404013698,-17.751217477,0.17,0.32,0.10,0.14,0.20,0.23,0.26 2012-04-10 13:59:02,74.491425339,-17.673972869,0.23,0.40,0.05,0.21,0.27,0.31,0.37 2012-04-10 14:00:32,74.578803432,-17.595777903,0.30,0.52,0.18,0.24,0.35,0.41,0.45 2012-04-10 14:02:02,74.666151075,-17.516672688,0.39,0.66,0.31,0.36,0.42,0.50,0.57 2012-04-10 14:03:31,74.753472154,-17.436711319,0.40,0.57,0.31,0.37,0.44,0.49,0.53 2012-04-10 14:05:00,74.840777241,-17.356037239,0.38,0.70,0.26,0.32,0.42,0.51,0.55 2012-04-10 14:06:29,74.928034766,-17.274163507,0.36,0.63,0.23,0.30,0.41,0.50,0.58 2012-04-10 14:07:58,75.015274283,-17.191548118,0.41,0.74,0.25,0.33,0.48,0.56,0.63 2012-04-10 14:09:27,75.102489106,-17.108079032,0.46,0.84,0.33,0.41,0.51,0.59,0.70 2012-04-10 14:10:56,75.189661031,-17.023451959,0.41,0.77,0.22,0.35,0.48,0.59,0.66 2012-04-10 14:12:24,75.276806115,-16.937904698,0.41,0.76,0.23,0.33,0.49,0.59,0.65 2012-04-10 14:13:52,75.363920115,-16.851377178,0.43,0.74,0.31,0.37,0.49,0.60,0.67 2012-04-10 14:15:20,75.45100312,-16.763860215,0.39,0.67,0.19,0.32,0.47,0.55,0.61 2012-04-10 14:16:47,75.538049415,-16.675237852,0.47,0.96,0.33,0.41,0.53,0.62,0.70 2012-04-10 14:18:15,75.625064248,-16.585592802,0.44,0.87,0.26,0.37,0.51,0.63,0.72 2012-04-10 14:19:42,75.712058339,-16.495102953,0.37,0.68,0.26,0.32,0.42,0.51,0.58 2012-04-10 14:21:09,75.799610098,-16.412847629,0.42,0.74,0.24,0.35,0.49,0.59,0.65 2012-04-10 14:22:37,75.885952437,-16.311036722,0.51,0.86,0.29,0.43,0.59,0.70,0.78 2012-04-10 14:24:03,75.972803213,-16.216672015,0.48,0.87,0.28,0.40,0.56,0.66,0.73 2012-04-10 14:25:27,76.059627602,-16.121292684,0.35,0.65,0.23,0.29,0.40,0.51,0.59 2012-04-10 14:26:53,76.146447685,-16.025264541,0.28,0.53,0.13,0.21,0.35,0.45,0.51 2012-04-10 14:28:19,76.233177498,-15.927236763,0.29,0.64,0.11,0.20,0.38,0.49,0.58 2012-04-10 14:29:43,76.319897306,-15.828452696,0.37,0.95,0.22,0.29,0.42,0.55,0.82 2012-04-10 14:31:08,76.406588625,-15.728586949,0.42,1.02,0.24,0.35,0.48,0.59,0.72 2012-04-10 14:32:34,76.493227652,-15.627283211,0.35,0.84,0.19,0.28,0.41,0.56,0.73 2012-04-10 14:33:59,76.579824881,-15.524689107,0.31,0.85,0.14,0.21,0.38,0.55,0.73 2012-04-10 14:35:24,76.666388296,-15.420923979,0.44,0.86,0.19,0.36,0.52,0.64,0.73 2012-04-10 14:36:50,76.75290532,-15.315770448,0.32,0.64,0.18,0.27,0.37,0.48,0.54 2012-04-10 14:38:16,76.839382585,-15.209306105,0.27,0.57,0.15,0.21,0.32,0.42,0.49 2012-04-10 14:39:42,76.925815273,-15.101458964,0.27,0.53,0.12,0.21,0.33,0.43,0.47 2012-04-10 14:41:08,77.012193643,-14.992065395,0.29,0.54,0.18,0.24,0.33,0.42,0.48 2012-04-10 14:42:34,77.098534287,-14.881381661,0.28,0.62,0.12,0.21,0.34,0.48,0.55 2012-04-10 14:44:00,77.184821956,-14.769119525,0.26,0.69,0.14,0.21,0.32,0.41,0.49 2012-04-10 14:45:27,77.27106063,-14.655351166,0.26,0.59,0.12,0.19,0.32,0.42,0.51 2012-04-10 14:46:53,77.35725744,-14.540173445,0.30,0.61,0.13,0.24,0.36,0.47,0.56 2012-04-10 14:48:19,77.443399369,-14.423364185,0.38,0.71,0.22,0.32,0.44,0.55,0.62 2012-04-10 14:49:46,77.529479084,-14.304748376,0.36,0.81,0.20,0.28,0.43,0.61,0.70 2012-04-10 14:51:12,77.615469164,-14.18398523,0.42,1.08,0.22,0.34,0.49,0.62,0.73 2012-04-10 14:52:38,77.701419548,-14.061782779,0.38,0.72,0.22,0.31,0.44,0.55,0.64 2012-04-10 14:54:05,77.787298166,-13.937636097,0.43,0.73,0.30,0.37,0.48,0.58,0.64 2012-04-10 14:55:31,77.873127404,-13.811881636,0.37,0.71,0.18,0.30,0.44,0.56,0.66 2012-04-10 14:56:57,77.958909962,-13.684508611,0.29,0.91,0.12,0.19,0.37,0.57,0.69 2012-04-10 14:58:23,78.044620689,-13.555130634,0.37,0.80,0.17,0.26,0.47,0.62,0.69 2012-04-10 14:59:49,78.130276533,-13.423994108,0.46,0.88,0.29,0.38,0.54,0.66,0.76 2012-04-10 15:01:15,78.215867247,-13.290928208,0.37,0.86,0.12,0.28,0.47,0.61,0.75 2012-04-10 15:02:41,78.301406215,-13.156100029,0.25,0.83,0.08,0.13,0.35,0.57,0.71 2012-04-10 15:04:08,78.386867687,-13.019104715,0.18,0.57,0.07,0.11,0.22,0.37,0.48 2012-04-10 15:05:35,78.472266364,-12.880152564,0.18,0.71,0.05,0.07,0.25,0.53,0.58 2012-04-10 15:07:03,78.557605024,-12.739264442,0.35,0.87,0.08,0.19,0.49,0.63,0.74 2012-04-10 15:08:29,78.642865485,-12.596128603,0.32,0.85,0.05,0.19,0.44,0.64,0.77 2012-04-10 15:09:56,78.728060051,-12.4509146081,0.18,0.47,0.05,0.10,0.25,0.35,0.41 2012-04-10 15:11:21,78.8133060417,-12.3032450792,0.21,1.02,0.06,0.11,0.26,0.50,0.94 2012-04-10 15:12:46,78.8986580369,-12.1546116988,0.15,0.43,0.06,0.09,0.20,0.29,0.37 2012-04-10 15:14:13,78.9836050291,-12.0018776427,0.17,0.46,0.05,0.09,0.23,0.32,0.37 2012-04-10 15:15:42,79.0677251801,-11.8486422505,0.16,0.51,0.07,0.12,0.19,0.27,0.37 2012-04-10 15:28:38,79.1507260269,-11.6922709318,0.17,2.43,0.08,0.11,0.18,0.31,0.74 2012-04-10 15:29:51,79.0639642111,-11.8517072275,0.19,0.43,0.10,0.16,0.22,0.29,0.33 2012-04-10 15:31:06,78.9734820892,-12.0163890743,0.16,0.37,0.08,0.10,0.22,0.30,0.33 2012-04-10 15:32:36,78.8670072243,-12.2086342665,0.18,0.72,0.09,0.13,0.22,0.27,0.36 2012-04-10 15:33:54,78.7763286449,-12.3658778035,0.19,1.59,0.08,0.10,0.19,0.45,1.04 2012-04-10 15:35:08,78.6902962215,-12.5119159815,0.29,0.74,0.13,0.20,0.35,0.51,0.61 2012-04-10 15:36:19,78.604903458,-12.653618269,0.25,0.65,0.07,0.11,0.37,0.50,0.60 2012-04-10 15:37:31,78.519774666,-12.798294211,0.37,0.79,0.10,0.24,0.48,0.64,0.73 2012-04-10 15:38:43,78.4344246713,-12.9385515627,0.17,0.55,0.07,0.10,0.23,0.32,0.42 2012-04-10 15:39:56,78.3489771778,-13.0762965383,0.16,0.30,0.09,0.13,0.18,0.23,0.27 2012-04-10 15:41:08,78.263502419,-13.212647641,0.34,0.67,0.14,0.24,0.43,0.53,0.62 2012-04-10 15:42:20,78.177946974,-13.346796988,0.47,0.80,0.22,0.41,0.55,0.66,0.72 2012-04-10 15:43:33,78.0923099,-13.478744814,0.46,0.88,0.24,0.35,0.58,0.69,0.76 2012-04-10 15:44:45,78.006648506,-13.609381377,0.29,0.66,0.16,0.22,0.36,0.50,0.59 2012-04-10 15:45:57,77.920910611,-13.737932635,0.33,1.00,0.14,0.21,0.43,0.54,0.62 2012-04-10 15:47:09,77.835124618,-13.864854499,0.45,0.76,0.33,0.40,0.50,0.59,0.70 2012-04-10 15:48:20,77.749264546,-13.989781635,0.42,0.70,0.31,0.37,0.46,0.56,0.61 2012-04-10 15:49:32,77.663356765,-14.113108264,0.42,0.67,0.31,0.37,0.48,0.55,0.59 2012-04-10 15:50:44,77.577367973,-14.234346245,0.44,0.79,0.29,0.38,0.50,0.60,0.68 2012-04-10 15:51:56,77.491375918,-14.354706344,0.38,0.74,0.24,0.31,0.45,0.55,0.62 2012-04-10 15:53:08,77.405236437,-14.471979216,0.39,0.65,0.26,0.33,0.45,0.54,0.60 2012-04-10 15:54:20,77.319091383,-14.588391887,0.30,0.50,0.17,0.25,0.35,0.41,0.45 2012-04-10 15:55:31,77.232874633,-14.702927102,0.28,0.57,0.16,0.22,0.34,0.41,0.47 2012-04-10 15:56:43,77.146609871,-14.815955786,0.29,0.48,0.18,0.23,0.35,0.41,0.44 2012-04-10 15:57:55,77.060289159,-14.927369256,0.33,0.59,0.20,0.28,0.37,0.47,0.55 2012-04-10 15:59:07,76.973950386,-15.037767419,0.30,0.52,0.19,0.26,0.35,0.41,0.45 2012-04-10 16:00:18,76.887535293,-15.146254607,0.29,0.48,0.18,0.24,0.33,0.40,0.44 2012-04-10 16:01:30,76.8011077006,-15.2538758636,0.30,0.59,0.16,0.25,0.35,0.44,0.53 2012-04-10 16:02:42,76.714592686,-15.359450698,0.39,0.70,0.23,0.31,0.46,0.56,0.65 2012-04-10 16:03:54,76.62807019,-15.46423056,0.48,0.80,0.28,0.41,0.55,0.64,0.73 2012-04-10 16:05:09,76.541490811,-15.567458972,0.34,0.71,0.17,0.25,0.41,0.53,0.63 2012-04-10 16:06:26,76.454875643,-15.669466355,0.40,0.75,0.23,0.33,0.47,0.56,0.67 2012-04-10 16:07:42,76.368200825,-15.769929557,0.44,0.96,0.29,0.37,0.49,0.63,0.81 2012-04-10 16:08:58,76.281516756,-15.869628171,0.41,0.66,0.30,0.37,0.45,0.52,0.59 2012-04-10 16:10:16,76.194772102,-15.967766301,0.29,0.62,0.14,0.22,0.35,0.46,0.52 2012-04-10 16:11:35,76.107989172,-16.064699547,0.35,0.72,0.18,0.29,0.42,0.51,0.60 2012-04-10 16:12:53,76.021168263,-16.160432583,0.46,0.71,0.34,0.39,0.51,0.61,0.65 2012-04-10 16:14:09,75.934330347,-16.255335873,0.52,0.87,0.35,0.44,0.59,0.69,0.76 2012-04-10 16:15:24,75.847434698,-16.348778011,0.51,0.89,0.35,0.43,0.57,0.67,0.79 2012-04-10 16:16:40,75.760517335,-16.441316398,0.42,0.68,0.31,0.37,0.47,0.55,0.61 2012-04-10 16:17:55,75.673553819,-16.532578599,0.40,0.73,0.29,0.35,0.44,0.58,0.66 2012-04-10 16:19:10,75.586564043,-16.622877121,0.50,0.75,0.37,0.44,0.55,0.64,0.70 2012-04-10 16:20:25,75.499524381,-16.71187717,0.50,0.81,0.38,0.44,0.54,0.64,0.71 2012-04-10 16:21:40,75.412478172,-16.800263092,0.41,0.66,0.25,0.36,0.47,0.53,0.59 2012-04-10 16:22:55,75.32536682,-16.887113985,0.49,0.75,0.36,0.43,0.55,0.64,0.67 2012-04-10 16:24:10,75.238246025,-16.973308337,0.42,0.69,0.26,0.35,0.49,0.60,0.65 2012-04-10 16:25:24,75.151093668,-17.058507814,0.47,0.78,0.36,0.42,0.52,0.60,0.68 2012-04-10 16:26:37,75.063896892,-17.142541758,0.51,0.73,0.42,0.47,0.55,0.61,0.67 2012-04-10 16:27:51,74.976686068,-17.225875135,0.36,0.59,0.26,0.32,0.40,0.46,0.53 2012-04-10 16:29:05,74.889432996,-17.308075385,0.41,0.61,0.30,0.37,0.45,0.52,0.56 2012-04-10 16:30:19,74.802144898,-17.389257118,0.42,0.65,0.32,0.38,0.46,0.52,0.56 2012-04-10 16:31:33,74.714840525,-17.469725244,0.42,0.60,0.34,0.39,0.45,0.49,0.54 2012-04-10 16:32:46,74.627515282,-17.549412726,0.39,0.64,0.27,0.34,0.43,0.48,0.52 2012-04-10 16:34:00,74.540148521,-17.628031455,0.32,0.57,0.24,0.28,0.35,0.42,0.49 2012-04-10 16:35:14,74.452749775,-17.705711731,0.23,0.38,0.13,0.21,0.27,0.31,0.34 2012-04-10 16:36:29,74.365340556,-17.78279949,0.15,0.27,0.09,0.12,0.18,0.21,0.23 2012-04-10 16:37:43,74.2778841982,-17.8587203293,0.09,0.21,0.05,0.07,0.12,0.14,0.16 2012-04-10 16:38:56,74.190322119,-17.934495548,0.05,0.15,0.02,0.04,0.06,0.08,0.10 2012-04-10 16:40:11,74.102759081,-18.008933779,0.03,0.11,0.00,0.01,0.03,0.06,0.11 2012-04-10 16:41:25,74.015222632,-18.082394302,nan,nan,nan,nan,nan,nan,nan 2012-04-10 16:42:39,73.927683618,-18.155417859,nan,nan,nan,nan,nan,nan,nan 2012-04-10 16:43:54,73.84011112,-18.227525245,nan,nan,nan,nan,nan,nan,nan 2012-04-10 16:45:09,73.752456576,-18.298967941,0.45,0.76,0.09,0.20,0.65,0.71,0.75 2012-04-10 16:46:26,73.664447963,-18.370082918,nan,nan,nan,nan,nan,nan,nan 2012-04-10 16:47:16,73.6097294628,-18.4136451942,nan,nan,nan,nan,nan,nan,nan