# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20180408.10km.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 2018-04-08 19:55:14,71.1039644167,-151.327597847,0.16,0.65,0.03,0.08,0.22,0.38,0.53 2018-04-08 19:56:36,71.189659473,-151.410956161,0.16,0.58,0.04,0.09,0.22,0.35,0.46 2018-04-08 19:57:56,71.2750006155,-151.494155571,0.15,0.60,0.02,0.08,0.21,0.34,0.45 2018-04-08 19:59:22,71.3610082697,-151.579264081,0.14,0.54,0.03,0.07,0.19,0.33,0.42 2018-04-08 20:00:51,71.4455078667,-151.665290189,0.11,0.49,0.05,0.07,0.14,0.22,0.33 2018-04-08 20:01:52,71.5053191594,-151.726825116,0.13,0.45,0.04,0.06,0.18,0.31,0.42 2018-04-08 20:05:27,71.7329986936,-151.977637529,0.12,0.27,0.02,0.05,0.19,0.23,0.26 2018-04-08 20:06:24,71.7979754666,-152.052349461,0.18,0.82,0.04,0.09,0.26,0.38,0.60 2018-04-08 20:07:34,71.8751739818,-152.139602999,0.20,0.59,0.09,0.14,0.25,0.34,0.44 2018-04-08 20:08:48,71.960171672,-152.233432613,0.12,0.41,0.06,0.07,0.16,0.28,0.33 2018-04-08 20:10:03,72.046509918,-152.313748949,0.11,0.35,0.05,0.07,0.13,0.20,0.29 2018-04-08 20:10:47,72.0962664809,-152.347075672,0.07,0.20,0.04,0.04,0.09,0.17,0.20 2018-04-08 20:14:07,72.256258648,-152.795046831,0.13,0.41,0.05,0.08,0.17,0.28,0.37 2018-04-08 20:15:30,72.309277894,-153.033329477,0.14,0.39,0.06,0.09,0.18,0.27,0.33 2018-04-08 20:16:54,72.36200641,-153.273000764,0.20,0.52,0.05,0.10,0.28,0.36,0.42 2018-04-08 20:18:18,72.414464296,-153.514021159,0.20,0.67,0.11,0.14,0.24,0.38,0.50 2018-04-08 20:19:42,72.466580973,-153.756544196,0.13,0.37,0.05,0.08,0.17,0.26,0.31 2018-04-08 20:21:07,72.518447877,-154.000372776,0.20,0.58,0.09,0.13,0.25,0.36,0.49 2018-04-08 20:22:31,72.573181639,-154.236795499,0.11,0.44,0.04,0.06,0.12,0.27,0.35 2018-04-08 20:23:54,72.632216987,-154.462915344,0.13,0.32,0.05,0.09,0.17,0.23,0.28 2018-04-08 20:25:18,72.690036186,-154.693638442,0.11,0.25,0.05,0.07,0.14,0.20,0.23 2018-04-08 20:26:41,72.747685615,-154.925638925,0.14,0.35,0.06,0.09,0.17,0.24,0.28 2018-04-08 20:28:03,72.805015742,-155.159242504,0.15,0.47,0.05,0.09,0.20,0.30,0.38 2018-04-08 20:29:33,72.8668256985,-155.414097797,0.11,0.32,0.06,0.08,0.12,0.18,0.28 2018-04-08 20:30:49,72.918851762,-155.630915304,0.16,0.48,0.05,0.09,0.20,0.31,0.42 2018-04-08 20:32:11,72.975358461,-155.869040497,0.10,0.33,0.05,0.06,0.13,0.20,0.27 2018-04-08 20:33:32,73.0315917117,-156.108699424,0.11,0.25,0.06,0.08,0.13,0.19,0.23 2018-04-08 20:34:53,73.087550636,-156.349879678,0.12,0.46,0.05,0.07,0.15,0.25,0.36 2018-04-08 20:36:14,73.143180671,-156.592742021,0.11,0.35,0.06,0.08,0.13,0.22,0.27 2018-04-08 20:37:34,73.19855168,-156.837069107,0.09,0.27,0.05,0.07,0.10,0.15,0.21 2018-04-08 20:38:54,73.253626613,-157.082981407,0.09,0.27,0.05,0.07,0.11,0.15,0.19 2018-04-08 20:40:15,73.308404609,-157.330471,0.11,0.42,0.06,0.07,0.12,0.21,0.33 2018-04-08 20:41:35,73.362910984,-157.579471356,0.10,0.32,0.06,0.07,0.12,0.21,0.28 2018-04-08 20:42:55,73.417104199,-157.830104754,0.10,0.29,0.06,0.07,0.13,0.19,0.25 2018-04-08 20:44:16,73.471012733,-158.082284579,0.11,0.29,0.06,0.08,0.13,0.19,0.24 2018-04-08 20:45:35,73.524590298,-158.336130772,0.10,0.27,0.06,0.07,0.12,0.17,0.20 2018-04-08 20:46:55,73.577878809,-158.591535558,0.10,0.28,0.06,0.07,0.11,0.15,0.19 2018-04-08 20:47:54,73.6167790163,-158.779987432,0.09,0.43,0.06,0.07,0.11,0.14,0.20 2018-04-08 20:52:10,73.82878107,-159.457824188,0.15,0.41,0.06,0.09,0.19,0.26,0.32 2018-04-08 20:53:13,73.8879990402,-159.598469778,0.17,0.41,0.06,0.10,0.23,0.33,0.39 2018-04-08 20:59:57,74.2704082311,-160.533216721,0.09,0.21,0.05,0.07,0.10,0.14,0.17 2018-04-08 21:01:42,74.3701067871,-160.786116459,0.08,0.19,0.04,0.06,0.09,0.13,0.16 2018-04-08 21:02:25,74.4113788749,-160.891770652,0.08,0.14,0.04,0.06,0.09,0.12,0.13 2018-04-08 21:03:39,74.4820557322,-161.073656282,0.10,0.24,0.06,0.07,0.12,0.17,0.22 2018-04-08 21:05:43,74.600836148,-161.384145787,0.10,0.30,0.06,0.07,0.09,0.23,0.28 2018-04-08 21:06:16,74.6316744734,-161.465804418,0.09,0.19,0.06,0.07,0.11,0.14,0.17 2018-04-08 21:08:13,74.7437340299,-161.765420633,0.12,0.27,0.06,0.08,0.15,0.21,0.24 2018-04-08 21:09:05,74.792575671,-161.897852694,0.12,0.29,0.07,0.09,0.15,0.19,0.25 2018-04-08 21:10:21,74.865604262,-162.097756341,0.12,0.41,0.06,0.08,0.15,0.21,0.26 2018-04-08 21:11:38,74.938532996,-162.299140222,0.13,0.36,0.06,0.08,0.15,0.25,0.30 2018-04-08 21:12:55,75.011258717,-162.502559,0.10,0.29,0.06,0.07,0.12,0.19,0.25 2018-04-08 21:14:11,75.083811057,-162.707857331,0.13,0.38,0.06,0.09,0.15,0.20,0.26 2018-04-08 21:15:27,75.15618838,-162.915063022,0.14,0.30,0.07,0.10,0.17,0.23,0.28 2018-04-08 21:16:44,75.228367416,-163.124309149,0.10,0.25,0.07,0.08,0.12,0.17,0.20 2018-04-08 21:18:00,75.300424785,-163.335216048,0.10,0.22,0.06,0.08,0.12,0.17,0.20 2018-04-08 21:19:16,75.372277659,-163.548196507,0.12,0.31,0.07,0.09,0.14,0.21,0.25 2018-04-08 21:20:32,75.443928886,-163.763260021,0.12,0.26,0.07,0.09,0.14,0.19,0.22 2018-04-08 21:21:47,75.515405935,-163.980274902,0.12,0.32,0.06,0.09,0.14,0.21,0.26 2018-04-08 21:23:03,75.586669907,-164.19943653,0.11,0.42,0.06,0.08,0.13,0.21,0.28 2018-04-08 21:24:19,75.657748881,-164.420633876,0.09,0.26,0.06,0.07,0.11,0.14,0.18 2018-04-08 21:25:34,75.728680948,-164.643688787,0.09,0.52,0.05,0.07,0.10,0.15,0.27 2018-04-08 21:26:49,75.799393244,-164.868997862,0.09,0.24,0.07,0.07,0.10,0.15,0.20 2018-04-08 21:28:06,75.8705028804,-165.09849168,0.09,0.26,0.05,0.06,0.10,0.17,0.22 2018-04-08 21:29:20,75.940155411,-165.326284091,0.13,0.40,0.07,0.09,0.16,0.25,0.28 2018-04-08 21:30:13,75.989224604,-165.48831208,0.16,0.44,0.07,0.11,0.20,0.29,0.41 2018-04-08 21:36:15,75.968065307,-166.986713333,0.17,0.60,0.08,0.11,0.22,0.29,0.37 2018-04-08 21:37:33,75.953664763,-167.352249066,0.14,0.44,0.07,0.09,0.17,0.26,0.32 2018-04-08 21:38:52,75.938775461,-167.717065922,0.14,0.41,0.05,0.10,0.19,0.27,0.34 2018-04-08 21:40:09,75.9233300697,-168.081113903,0.12,0.35,0.03,0.08,0.16,0.24,0.32 2018-04-08 21:41:27,75.9073631873,-168.443830155,0.14,0.52,0.06,0.08,0.17,0.30,0.42 2018-04-08 21:43:03,75.8865017921,-168.899459987,0.10,0.31,0.05,0.08,0.12,0.18,0.24 2018-04-08 21:44:05,75.873729776,-169.16836593,0.10,0.30,0.05,0.07,0.12,0.17,0.24 2018-04-08 21:45:31,75.856043311,-169.529007352,0.11,0.30,0.06,0.08,0.13,0.21,0.25 2018-04-08 21:46:52,75.837860243,-169.888797127,0.12,0.48,0.05,0.07,0.15,0.28,0.36 2018-04-08 21:48:15,75.81916621,-170.247693466,0.10,0.38,0.03,0.06,0.13,0.22,0.28 2018-04-08 21:49:39,75.799941189,-170.605641408,0.12,0.41,0.05,0.07,0.15,0.25,0.35 2018-04-08 21:51:00,75.7802398772,-170.962680697,0.12,0.31,0.05,0.08,0.15,0.22,0.27 2018-04-08 21:52:21,75.759911764,-171.318638543,0.13,0.38,0.06,0.09,0.16,0.23,0.30 2018-04-08 21:53:41,75.739138867,-171.673670173,0.11,0.42,0.04,0.07,0.14,0.24,0.33 2018-04-08 21:55:02,75.717790373,-172.027635763,0.11,0.34,0.05,0.08,0.13,0.21,0.27 2018-04-08 21:56:23,75.695953996,-172.380583844,0.12,0.56,0.04,0.07,0.14,0.23,0.31 2018-04-08 21:57:45,75.673576087,-172.732448703,0.11,0.47,0.04,0.07,0.13,0.21,0.31 2018-04-08 21:59:07,75.650649627,-173.083197348,0.10,0.41,0.04,0.06,0.12,0.18,0.30 2018-04-08 22:00:29,75.627195831,-173.432810295,0.12,0.38,0.03,0.07,0.15,0.25,0.32 2018-04-08 22:01:50,75.603296908,-173.781374406,0.10,0.38,0.04,0.06,0.12,0.19,0.26 2018-04-08 22:03:10,75.578845602,-174.128744725,0.12,0.47,0.05,0.08,0.16,0.23,0.31 2018-04-08 22:04:29,75.553934018,-174.47500945,0.12,0.42,0.05,0.07,0.15,0.24,0.32 2018-04-08 22:05:49,75.528518495,-174.820088695,0.09,0.29,0.04,0.06,0.12,0.19,0.24 2018-04-08 22:07:09,75.502598282,-175.163972002,0.11,0.48,0.04,0.07,0.14,0.21,0.31 2018-04-08 22:08:29,75.476169182,-175.506628539,0.11,0.45,0.04,0.06,0.15,0.21,0.29 2018-04-08 22:09:50,75.449270188,-175.848088774,0.10,0.32,0.04,0.06,0.13,0.20,0.26 2018-04-08 22:11:11,75.421838313,-176.188252541,0.12,0.45,0.05,0.07,0.15,0.24,0.34 2018-04-08 22:12:32,75.393805981,-176.527009569,0.10,0.26,0.04,0.07,0.13,0.19,0.24 2018-04-08 22:13:53,75.365421627,-176.864668972,0.10,0.45,0.05,0.07,0.12,0.21,0.28 2018-04-08 22:15:13,75.336548844,-177.201028389,0.09,0.58,0.04,0.06,0.11,0.20,0.32 2018-04-08 22:16:34,75.307187863,-177.536072481,0.11,0.40,0.04,0.06,0.13,0.24,0.35 2018-04-08 22:17:56,75.27736242,-177.869820706,0.11,0.50,0.04,0.07,0.14,0.23,0.31 2018-04-08 22:19:17,75.247043376,-178.202215226,0.11,0.35,0.02,0.06,0.15,0.24,0.31 2018-04-08 22:20:39,75.216263805,-178.533288203,0.11,0.36,0.05,0.07,0.14,0.23,0.29 2018-04-08 22:22:00,75.184974539,-178.862948394,0.14,0.54,0.05,0.09,0.16,0.27,0.43 2018-04-08 22:23:21,75.153265477,-179.191302846,0.17,0.59,0.06,0.12,0.22,0.30,0.42 2018-04-08 22:24:42,75.121020551,-179.518172233,0.11,0.45,0.05,0.07,0.13,0.24,0.32 2018-04-08 22:26:03,75.088402649,-173.008382234,0.13,0.42,0.05,0.08,0.16,0.24,0.37 2018-04-08 22:27:23,75.055273426,179.832076042,0.13,0.54,0.05,0.09,0.16,0.24,0.31 2018-04-08 22:28:31,75.0272571057,179.562124466,0.10,0.33,0.04,0.06,0.13,0.23,0.30 2018-04-08 22:34:05,74.785545723,179.414932843,0.11,0.39,0.05,0.07,0.14,0.24,0.31 2018-04-08 22:35:30,74.712295729,179.612620819,0.10,0.65,0.04,0.06,0.13,0.22,0.33 2018-04-08 22:37:00,74.638926625,179.808750396,0.13,0.46,0.05,0.08,0.17,0.26,0.36 2018-04-08 22:38:28,74.56533931,-5.267373089,0.10,0.35,0.03,0.06,0.13,0.20,0.25 2018-04-08 22:39:54,74.491657496,-179.804542014,0.11,0.43,0.05,0.07,0.13,0.22,0.28 2018-04-08 22:41:19,74.417818955,-179.613639516,0.09,0.35,0.05,0.06,0.11,0.18,0.23 2018-04-08 22:42:44,74.343802435,-179.424577059,0.16,0.98,0.05,0.09,0.20,0.34,0.53 2018-04-08 22:44:09,74.269625817,-179.237245052,0.12,0.43,0.04,0.08,0.15,0.24,0.33 2018-04-08 22:45:35,74.19529498,-179.051601224,0.10,0.35,0.05,0.06,0.13,0.20,0.26 2018-04-08 22:47:00,74.120849277,-178.867442312,0.10,0.38,0.05,0.07,0.12,0.19,0.25 2018-04-08 22:48:27,74.046264589,-178.68487289,0.13,0.59,0.04,0.07,0.17,0.30,0.46 2018-04-08 22:49:53,73.971523449,-178.503984915,0.10,0.45,0.04,0.06,0.12,0.21,0.28 2018-04-08 22:51:20,73.896615305,-178.324814758,0.11,0.53,0.05,0.06,0.14,0.23,0.31 2018-04-08 22:52:46,73.821592713,-178.147089116,0.13,0.33,0.03,0.08,0.17,0.24,0.28 2018-04-08 22:54:13,73.746429536,-177.97092352,0.13,0.41,0.05,0.08,0.16,0.24,0.37 2018-04-08 22:55:40,73.671171021,-177.796068324,0.15,0.50,0.05,0.10,0.19,0.28,0.38 2018-04-08 22:57:08,73.595766349,-177.622793772,0.14,0.54,0.04,0.08,0.18,0.28,0.42 2018-04-08 22:58:35,73.5202193,-177.451079127,0.16,0.44,0.06,0.10,0.20,0.28,0.36 2018-04-08 23:00:02,73.44453065,-177.280897622,0.13,0.47,0.05,0.08,0.16,0.27,0.40 2018-04-08 23:01:29,73.36871488,-177.112183242,0.11,0.35,0.05,0.07,0.14,0.20,0.25 2018-04-08 23:02:56,73.292738021,-176.94509138,0.11,0.38,0.04,0.06,0.15,0.24,0.29 2018-04-08 23:04:23,73.216725213,-176.778930918,0.11,0.38,0.05,0.07,0.13,0.21,0.26 2018-04-08 23:05:50,73.14053932,-176.614452403,0.09,0.28,0.05,0.06,0.11,0.19,0.24 2018-04-08 23:07:17,73.064222886,-176.451412711,0.10,0.36,0.05,0.06,0.12,0.17,0.23 2018-04-08 23:08:45,72.987769514,-176.289850749,0.11,0.36,0.03,0.07,0.14,0.20,0.25 2018-04-08 23:10:13,72.911257081,-176.129314041,0.13,0.79,0.04,0.07,0.15,0.28,0.51 2018-04-08 23:11:40,72.83464898,-175.970008181,0.12,0.34,0.05,0.08,0.15,0.21,0.27 2018-04-08 23:13:07,72.75786575,-175.812348296,0.11,0.31,0.04,0.07,0.14,0.22,0.27 2018-04-08 23:14:35,72.680990207,-175.655904256,0.10,0.27,0.05,0.07,0.13,0.19,0.23 2018-04-08 23:16:02,72.6039797,-175.500870522,0.11,0.31,0.05,0.07,0.15,0.22,0.26 2018-04-08 23:17:31,72.5268711806,-175.347052864,0.14,0.39,0.05,0.08,0.18,0.25,0.30 2018-04-08 23:19:03,72.4456256847,-175.186178932,0.11,0.60,0.04,0.06,0.12,0.30,0.44 2018-04-08 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23:56:00,70.408613089,-171.62347509,0.11,0.29,0.04,0.07,0.14,0.22,0.26 2018-04-08 23:57:25,70.328973878,-171.499768442,0.09,0.31,0.04,0.05,0.11,0.19,0.25 2018-04-08 23:58:49,70.24926406,-171.376947131,0.11,0.31,0.03,0.08,0.13,0.19,0.23 2018-04-08 23:59:52,70.1898184292,-171.286095639,0.07,0.19,0.03,0.05,0.08,0.13,0.15