# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20140325.10km.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 2014-03-25 11:25:48,76.9574282794,-74.790054188,0.09,0.25,0.05,0.07,0.11,0.16,0.20 2014-03-25 11:27:16,77.0489205482,-74.7429848138,0.08,0.23,0.04,0.05,0.10,0.15,0.19 2014-03-25 11:28:40,77.1397047855,-74.6949441713,0.09,0.18,0.06,0.08,0.10,0.12,0.15 2014-03-25 11:30:07,77.2289978113,-74.6469650368,0.09,0.13,0.06,0.07,0.10,0.11,0.11 2014-03-25 11:31:36,77.3191821348,-74.5975951835,0.10,0.14,0.07,0.09,0.10,0.12,0.13 2014-03-25 11:36:21,77.6154237007,-74.430980703,0.08,0.22,0.05,0.07,0.09,0.11,0.14 2014-03-25 11:37:52,77.7057850931,-74.3787994775,0.07,0.11,0.05,0.06,0.07,0.08,0.09 2014-03-25 11:39:23,77.7949113678,-74.325850811,0.07,0.11,0.05,0.06,0.08,0.10,0.11 2014-03-25 11:40:53,77.884050056,-74.273015673,0.07,0.11,0.05,0.05,0.07,0.09,0.11 2014-03-25 11:42:23,77.97316035,-74.218664392,0.07,0.10,0.05,0.06,0.07,0.08,0.09 2014-03-25 11:43:52,78.06226796,-74.163827495,0.07,0.15,0.05,0.06,0.07,0.09,0.12 2014-03-25 11:45:23,78.1513507615,-74.1076688321,0.07,0.11,0.05,0.06,0.08,0.09,0.10 2014-03-25 11:46:54,78.240444783,-74.051532455,0.07,0.17,0.05,0.05,0.07,0.10,0.11 2014-03-25 11:48:23,78.3297117411,-73.9948748506,0.07,0.15,0.05,0.06,0.09,0.11,0.13 2014-03-25 11:49:53,78.414583391,-73.8564389,0.08,0.15,0.06,0.07,0.10,0.12,0.13 2014-03-25 11:51:21,78.4959611008,-73.666007142,0.06,0.16,0.05,0.05,0.07,0.09,0.12 2014-03-25 11:52:50,78.577783823,-73.479394358,0.06,0.13,0.05,0.05,0.06,0.09,0.10 2014-03-25 11:54:20,78.659496572,-73.290241441,0.07,0.17,0.04,0.05,0.07,0.10,0.12 2014-03-25 11:55:50,78.7410833524,-73.0983752259,0.06,0.12,0.04,0.05,0.06,0.09,0.11 2014-03-25 11:57:22,78.822537187,-72.903657631,0.06,0.15,0.05,0.06,0.07,0.08,0.10 2014-03-25 11:58:54,78.903848245,-72.705956711,0.06,0.09,0.05,0.05,0.06,0.07,0.08 2014-03-25 12:00:24,78.985038582,-72.505486431,0.06,0.10,0.05,0.05,0.06,0.07,0.08 2014-03-25 12:01:53,79.06608328,-72.301958161,0.06,0.08,0.05,0.05,0.06,0.07,0.07 2014-03-25 12:03:24,79.1470049148,-72.0955603403,0.05,0.08,0.05,0.05,0.06,0.06,0.07 2014-03-25 12:04:57,79.2277759231,-71.8859822652,0.05,0.10,0.04,0.05,0.06,0.06,0.07 2014-03-25 12:06:33,79.3083883129,-71.6731070453,0.05,0.08,0.04,0.05,0.05,0.06,0.07 2014-03-25 12:08:06,79.3888845926,-71.4573668913,0.05,0.10,0.05,0.05,0.06,0.07,0.09 2014-03-25 12:09:38,79.469200988,-71.238017909,0.06,0.11,0.05,0.05,0.07,0.08,0.09 2014-03-25 12:11:09,79.549412839,-71.015885185,0.07,0.11,0.05,0.06,0.08,0.09,0.10 2014-03-25 12:12:47,79.6298730713,-70.7888553775,0.07,0.10,0.05,0.06,0.07,0.08,0.09 2014-03-25 12:14:32,79.710150078,-70.557834356,0.11,0.56,0.05,0.06,0.15,0.28,0.42 2014-03-25 12:16:12,79.789848539,-70.324917008,0.18,0.50,0.05,0.10,0.25,0.40,0.45 2014-03-25 12:17:47,79.869406134,-70.088660374,0.11,0.39,0.05,0.06,0.13,0.25,0.33 2014-03-25 12:19:23,79.948762016,-69.848381733,0.16,0.54,0.06,0.09,0.21,0.30,0.38 2014-03-25 12:21:01,80.027942103,-69.604343916,0.13,0.41,0.05,0.09,0.17,0.25,0.32 2014-03-25 12:22:39,80.106957152,-69.356618211,0.14,0.38,0.07,0.11,0.17,0.23,0.33 2014-03-25 12:24:17,80.185765557,-69.104671783,0.17,0.70,0.05,0.09,0.20,0.34,0.51 2014-03-25 12:25:57,80.264400201,-68.848855275,0.19,0.42,0.08,0.14,0.24,0.33,0.38 2014-03-25 12:27:43,80.342819194,-68.588737637,0.25,0.79,0.09,0.16,0.32,0.49,0.69 2014-03-25 12:29:24,80.421142631,-68.324008143,0.11,0.26,0.05,0.07,0.13,0.19,0.22 2014-03-25 12:31:01,80.497150286,-68.03492913,0.09,0.25,0.06,0.07,0.10,0.14,0.20 2014-03-25 12:32:39,80.57008078,-67.715427432,0.08,0.27,0.05,0.05,0.09,0.17,0.23 2014-03-25 12:34:20,80.642873821,-67.392350555,0.09,0.27,0.05,0.06,0.12,0.17,0.22 2014-03-25 12:36:02,80.715252292,-67.06358382,0.06,0.13,0.04,0.05,0.06,0.08,0.11 2014-03-25 12:37:42,80.78731079,-66.729831669,0.09,0.31,0.05,0.05,0.10,0.19,0.24 2014-03-25 12:39:20,80.859088437,-66.391135198,0.08,0.27,0.05,0.06,0.09,0.13,0.20 2014-03-25 12:40:59,80.9305351,-66.047039194,0.07,0.21,0.05,0.05,0.07,0.12,0.15 2014-03-25 12:42:40,81.001653479,-65.697517208,0.06,0.15,0.04,0.05,0.06,0.08,0.12 2014-03-25 12:44:22,81.072445812,-65.342557078,0.07,0.25,0.04,0.05,0.08,0.15,0.20 2014-03-25 12:46:03,81.142874963,-64.981817157,0.06,0.14,0.04,0.05,0.06,0.09,0.12 2014-03-25 12:47:42,81.212984069,-64.614904835,0.06,0.16,0.05,0.05,0.07,0.10,0.12 2014-03-25 12:49:21,81.283177955,-64.240237186,0.06,0.14,0.05,0.05,0.06,0.09,0.12 2014-03-25 12:50:57,81.354225228,-63.870995856,0.06,0.27,0.05,0.05,0.06,0.07,0.13 2014-03-25 12:52:31,81.434503424,-63.59556747,0.07,0.16,0.05,0.06,0.07,0.09,0.12 2014-03-25 12:54:05,81.515857802,-63.32924135,0.07,0.17,0.05,0.06,0.07,0.10,0.12 2014-03-25 12:55:38,81.596538886,-63.058916753,0.07,0.17,0.05,0.06,0.07,0.10,0.12 2014-03-25 12:57:12,81.676920595,-62.783173119,0.07,0.13,0.06,0.06,0.07,0.09,0.10 2014-03-25 12:58:46,81.757158939,-62.502791549,0.07,0.15,0.05,0.06,0.08,0.11,0.13 2014-03-25 13:00:21,81.837177481,-62.216664553,0.07,0.16,0.06,0.06,0.07,0.08,0.14 2014-03-25 13:01:53,81.916524499,-61.918340201,0.07,0.10,0.06,0.06,0.07,0.08,0.09 2014-03-25 13:03:25,81.993807599,-61.591084487,0.19,0.60,0.07,0.09,0.24,0.39,0.54 2014-03-25 13:04:58,82.070959131,-61.259102743,0.22,0.54,0.08,0.11,0.31,0.41,0.47 2014-03-25 13:06:30,82.147818655,-60.920363523,0.14,0.71,0.07,0.09,0.16,0.32,0.47 2014-03-25 13:08:02,82.2244196,-60.575251181,0.10,0.29,0.07,0.08,0.11,0.16,0.24 2014-03-25 13:09:34,82.300721467,-60.22310068,0.12,0.28,0.07,0.09,0.14,0.21,0.25 2014-03-25 13:11:06,82.3778625774,-59.8585667269,0.10,0.35,0.07,0.09,0.11,0.16,0.19 2014-03-25 13:12:14,82.4352999209,-59.5822704473,0.11,0.29,0.06,0.08,0.13,0.19,0.27