# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20140331.10km.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 2014-03-31 14:47:51,84.30016254,-28.985049949,0.22,0.51,0.06,0.13,0.29,0.41,0.45 2014-03-31 14:49:22,84.396723056,-29.342964047,0.22,0.53,0.05,0.14,0.30,0.41,0.48 2014-03-31 14:50:42,84.480236294,-29.684463202,0.22,0.66,0.11,0.15,0.26,0.39,0.52 2014-03-31 14:52:02,84.56358114,-30.035558798,0.26,0.81,0.09,0.16,0.33,0.45,0.56 2014-03-31 14:53:22,84.646708356,-30.3977536,0.26,1.02,0.14,0.19,0.30,0.44,0.69 2014-03-31 14:54:42,84.72959676,-30.771810549,0.24,0.74,0.06,0.17,0.29,0.43,0.56 2014-03-31 14:56:02,84.812264443,-31.157530512,0.29,0.82,0.13,0.21,0.35,0.48,0.63 2014-03-31 14:57:23,84.894712695,-31.555144237,0.22,0.49,0.10,0.16,0.27,0.39,0.46 2014-03-31 14:58:43,84.9769193,-31.965471529,0.19,0.61,0.09,0.13,0.24,0.37,0.45 2014-03-31 15:00:02,85.058866967,-32.389235104,0.17,0.56,0.08,0.11,0.20,0.33,0.46 2014-03-31 15:01:22,85.140557278,-32.826691424,0.21,0.58,0.05,0.14,0.26,0.40,0.51 2014-03-31 15:02:41,85.221951843,-33.279174217,0.20,0.69,0.08,0.12,0.24,0.39,0.53 2014-03-31 15:04:00,85.303025128,-33.747641954,0.24,0.60,0.09,0.18,0.29,0.42,0.52 2014-03-31 15:05:19,85.383815539,-34.231468583,0.21,0.52,0.10,0.15,0.27,0.38,0.46 2014-03-31 15:06:39,85.464289183,-34.731878048,0.28,0.74,0.10,0.18,0.36,0.52,0.61 2014-03-31 15:07:58,85.544358744,-35.251447257,0.21,0.50,0.10,0.15,0.26,0.35,0.41 2014-03-31 15:09:17,85.624106537,-35.788549693,0.22,0.60,0.09,0.16,0.26,0.38,0.45 2014-03-31 15:10:37,85.703452812,-36.345634637,0.20,0.55,0.09,0.15,0.25,0.35,0.42 2014-03-31 15:11:56,85.782364231,-36.923951678,0.24,0.70,0.13,0.17,0.28,0.43,0.59 2014-03-31 15:13:16,85.860890709,-37.522751384,0.18,0.51,0.08,0.12,0.23,0.34,0.46 2014-03-31 15:14:36,85.938928705,-38.145074774,0.20,0.61,0.10,0.14,0.23,0.36,0.46 2014-03-31 15:15:57,86.016503187,-38.790882951,0.21,0.52,0.11,0.15,0.25,0.38,0.48 2014-03-31 15:17:17,86.093509346,-39.463303982,0.24,0.59,0.11,0.16,0.30,0.45,0.52 2014-03-31 15:18:38,86.169994078,-40.16174733,0.21,0.77,0.10,0.14,0.24,0.38,0.57 2014-03-31 15:19:58,86.24593687,-40.887337522,0.21,0.56,0.10,0.14,0.27,0.39,0.47 2014-03-31 15:21:20,86.322037805,-41.651890981,0.28,0.69,0.12,0.19,0.34,0.50,0.58 2014-03-31 15:22:49,86.404922657,-42.528456351,0.22,0.55,0.10,0.15,0.28,0.40,0.49 2014-03-31 15:23:59,86.4685706248,-43.2380432476,0.21,0.39,0.12,0.16,0.24,0.33,0.37 2014-03-31 15:30:35,86.4153479297,-43.3899731262,0.23,0.58,0.11,0.17,0.28,0.37,0.46 2014-03-31 15:31:54,86.340718917,-44.186075225,0.26,1.02,0.11,0.15,0.30,0.67,0.86 2014-03-31 15:33:14,86.265418332,-44.950378186,0.24,0.66,0.12,0.18,0.28,0.39,0.51 2014-03-31 15:34:34,86.18946953,-45.685182815,0.23,0.54,0.12,0.17,0.28,0.38,0.46 2014-03-31 15:35:54,86.113063265,-46.391258606,0.23,0.68,0.10,0.15,0.29,0.42,0.52 2014-03-31 15:37:14,86.036108802,-47.068283601,0.23,0.64,0.12,0.16,0.27,0.41,0.52 2014-03-31 15:38:34,85.958650742,-47.720130747,0.19,0.62,0.08,0.11,0.25,0.40,0.47 2014-03-31 15:39:54,85.880722356,-48.348186899,0.18,0.48,0.07,0.12,0.22,0.31,0.43 2014-03-31 15:41:14,85.802319133,-48.95284984,0.19,0.52,0.04,0.13,0.24,0.33,0.44 2014-03-31 15:42:34,85.723482372,-49.535730623,0.26,0.71,0.14,0.20,0.32,0.44,0.51 2014-03-31 15:43:54,85.64418614,-50.096650871,0.25,0.56,0.11,0.19,0.31,0.39,0.45 2014-03-31 15:45:13,85.564490672,-50.637536358,0.25,0.66,0.12,0.19,0.31,0.41,0.49 2014-03-31 15:46:33,85.484422082,-51.15948292,0.24,0.63,0.12,0.18,0.30,0.39,0.47 2014-03-31 15:47:53,85.404040088,-51.664411997,0.24,0.62,0.11,0.17,0.28,0.42,0.52 2014-03-31 15:49:13,85.323373381,-52.15349557,0.22,0.63,0.11,0.16,0.26,0.38,0.49 2014-03-31 15:50:33,85.242312368,-52.6242950272,0.26,0.69,0.12,0.18,0.32,0.43,0.55 2014-03-31 15:51:53,85.160934222,-53.079109067,0.27,0.90,0.11,0.18,0.32,0.46,0.78 2014-03-31 15:53:12,85.079287572,-53.519521123,0.28,0.68,0.14,0.20,0.33,0.46,0.52 2014-03-31 15:54:31,84.99740542,-53.946707409,0.22,0.83,0.10,0.14,0.28,0.42,0.59 2014-03-31 15:55:50,84.915229828,-54.359511109,0.22,0.59,0.05,0.15,0.27,0.39,0.46 2014-03-31 15:57:09,84.832848241,-54.760433655,0.22,1.05,0.11,0.15,0.26,0.43,0.67 2014-03-31 15:58:28,84.75019354,-55.148017746,0.24,0.55,0.13,0.17,0.30,0.39,0.46 2014-03-31 15:59:46,84.667320776,-55.523943801,0.28,1.03,0.12,0.21,0.33,0.47,0.69 2014-03-31 16:01:05,84.58424903,-55.888951653,0.29,0.78,0.12,0.19,0.36,0.53,0.66 2014-03-31 16:02:23,84.500969454,-56.243084702,0.28,0.74,0.14,0.21,0.33,0.47,0.56 2014-03-31 16:03:42,84.417482638,-56.586547154,0.27,0.66,0.11,0.19,0.34,0.45,0.58 2014-03-31 16:05:00,84.33379984,-56.919834391,0.24,0.80,0.11,0.16,0.28,0.46,0.60 2014-03-31 16:06:19,84.249954177,-57.244006088,0.24,0.86,0.10,0.16,0.29,0.44,0.67 2014-03-31 16:07:37,84.165949348,-57.559388034,0.21,0.61,0.11,0.15,0.25,0.38,0.49 2014-03-31 16:08:56,84.081816029,-57.86695294,0.21,0.71,0.10,0.14,0.26,0.43,0.56 2014-03-31 16:10:15,83.997408809,-58.16303046,0.20,0.80,0.10,0.13,0.23,0.40,0.49 2014-03-31 16:11:33,83.912948052,-58.453568731,0.24,0.74,0.09,0.17,0.30,0.42,0.55 2014-03-31 16:12:52,83.828311566,-58.735522172,0.26,0.71,0.13,0.20,0.31,0.43,0.61 2014-03-31 16:14:09,83.743540325,-59.01012531,0.24,0.85,0.11,0.16,0.30,0.43,0.61 2014-03-31 16:15:27,83.65863451,-59.277541903,0.25,0.69,0.11,0.17,0.30,0.48,0.61 2014-03-31 16:16:45,83.573621518,-59.538598502,0.26,0.76,0.13,0.18,0.30,0.47,0.57 2014-03-31 16:18:02,83.488446604,-59.791976638,0.23,0.93,0.09,0.14,0.29,0.41,0.65 2014-03-31 16:19:20,83.403190359,-60.039934746,0.16,0.72,0.09,0.11,0.19,0.31,0.49 2014-03-31 16:20:38,83.317794489,-60.281036505,0.19,0.72,0.08,0.12,0.24,0.38,0.50 2014-03-31 16:21:56,83.232308548,-60.516751806,0.27,1.06,0.12,0.20,0.32,0.49,0.86 2014-03-31 16:23:16,83.146697103,-60.74621088,0.11,0.90,0.06,0.07,0.11,0.20,0.62 2014-03-31 16:24:37,83.061007116,-60.970756847,0.10,0.51,0.06,0.06,0.09,0.31,0.40 2014-03-31 16:25:58,82.975196221,-61.189363616,0.07,0.15,0.06,0.06,0.08,0.10,0.12 2014-03-31 16:27:19,82.889306132,-61.403207218,0.08,0.16,0.07,0.07,0.09,0.11,0.14 2014-03-31 16:28:40,82.803303065,-61.611637875,0.09,0.19,0.07,0.08,0.10,0.12,0.15 2014-03-31 16:30:01,82.717238219,-61.815964881,0.13,0.63,0.08,0.09,0.13,0.28,0.52 2014-03-31 16:31:20,82.6354396897,-62.0056574883,0.24,0.82,0.08,0.10,0.36,0.53,0.75