# Filename: NOAA_LSA_PODS.Arc.Surface_Roughness.v01.20120328.10km.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 2012-03-28 14:51:40,86.100261657,8.48943935,0.18,0.42,0.10,0.13,0.21,0.28,0.37 2012-03-28 14:53:01,86.176714752,7.78901393,0.19,0.40,0.12,0.14,0.22,0.28,0.32 2012-03-28 14:54:22,86.252642458,7.061774647,0.18,0.43,0.09,0.13,0.21,0.31,0.37 2012-03-28 14:55:45,86.328037004,6.306851554,0.16,0.40,0.11,0.13,0.18,0.25,0.31 2012-03-28 14:57:08,86.402495594,5.514025565,0.20,0.51,0.12,0.15,0.22,0.31,0.44 2012-03-28 14:58:30,86.476534432,4.694769448,0.20,0.52,0.11,0.15,0.23,0.33,0.45 2012-03-28 14:59:52,86.549720789,3.838202057,0.17,0.40,0.10,0.13,0.20,0.27,0.33 2012-03-28 15:01:15,86.622082463,2.944269956,0.19,0.40,0.11,0.14,0.22,0.30,0.36 2012-03-28 15:02:39,86.693548221,2.010580178,0.20,0.46,0.10,0.15,0.23,0.32,0.40 2012-03-28 15:04:04,86.764357848,1.041656674,0.16,0.51,0.06,0.11,0.19,0.28,0.37 2012-03-28 15:05:27,86.834226393,0.03026198,0.16,0.49,0.04,0.10,0.21,0.31,0.40 2012-03-28 15:06:46,86.902673978,-1.034838065,0.17,0.42,0.05,0.13,0.20,0.28,0.34 2012-03-28 15:08:07,86.9701652392,-2.14425172567,0.16,0.61,0.04,0.11,0.19,0.31,0.45 2012-03-28 15:09:29,87.036799012,-3.296854681,0.17,0.41,0.10,0.13,0.20,0.29,0.36 2012-03-28 15:10:54,87.101968971,-4.506295154,0.19,0.52,0.12,0.15,0.22,0.30,0.37 2012-03-28 15:12:18,87.165817107,-5.770218926,0.21,0.48,0.12,0.16,0.24,0.34,0.41 2012-03-28 15:13:42,87.22822031,-7.091768578,0.20,0.48,0.11,0.15,0.25,0.34,0.43 2012-03-28 15:15:05,87.289078535,-8.473456218,0.21,0.51,0.12,0.16,0.25,0.35,0.42 2012-03-28 15:16:28,87.348346224,-9.916680557,0.16,0.39,0.09,0.11,0.19,0.28,0.34 2012-03-28 15:17:51,87.405898824,-11.424107441,0.17,0.40,0.10,0.13,0.20,0.30,0.38 2012-03-28 15:19:14,87.46158634,-12.998587861,0.14,0.39,0.09,0.11,0.16,0.23,0.28 2012-03-28 15:20:37,87.515239781,-14.642912951,0.18,0.51,0.10,0.13,0.22,0.32,0.39 2012-03-28 15:22:00,87.566725399,-16.358794352,0.20,0.62,0.11,0.15,0.24,0.33,0.46 2012-03-28 15:23:23,87.616050148,-18.1454461,0.20,0.41,0.12,0.16,0.23,0.31,0.36 2012-03-28 15:24:47,87.663021054,-20.004819794,0.22,0.48,0.11,0.17,0.26,0.33,0.42 2012-03-28 15:26:11,87.707000241,-21.944196383,0.19,0.55,0.11,0.13,0.22,0.35,0.43 2012-03-28 15:27:35,87.74905851,-23.94671309,0.21,0.49,0.12,0.15,0.25,0.35,0.40 2012-03-28 15:28:59,87.787856346,-26.027615099,0.17,0.39,0.09,0.12,0.21,0.30,0.36 2012-03-28 15:30:24,87.823638534,-28.179805742,0.15,0.49,0.09,0.11,0.17,0.25,0.34 2012-03-28 15:31:48,87.85628265,-30.400367385,0.17,0.46,0.09,0.13,0.19,0.30,0.39 2012-03-28 15:33:12,87.885831376,-32.684095861,0.21,0.68,0.11,0.14,0.26,0.40,0.53 2012-03-28 15:34:36,87.911822737,-35.029456325,0.18,0.40,0.10,0.13,0.22,0.28,0.36 2012-03-28 15:36:01,87.934157774,-37.430318341,0.18,0.60,0.09,0.12,0.23,0.32,0.39 2012-03-28 15:37:24,87.952639293,-39.880009702,0.27,0.68,0.12,0.21,0.34,0.43,0.51 2012-03-28 15:38:48,87.967712231,-42.368081836,0.20,0.48,0.10,0.14,0.24,0.32,0.39 2012-03-28 15:40:11,87.978762042,-44.888839661,0.19,0.75,0.10,0.14,0.23,0.32,0.45 2012-03-28 15:41:35,87.986009404,-47.432011112,0.17,0.48,0.10,0.12,0.19,0.31,0.40 2012-03-28 15:43:02,87.989154634,-49.988619669,0.19,0.57,0.10,0.13,0.22,0.33,0.44 2012-03-28 15:44:31,87.988336355,-52.548111027,0.20,0.71,0.09,0.14,0.24,0.36,0.52 2012-03-28 15:45:59,87.983373947,-55.100173679,0.20,0.51,0.10,0.15,0.25,0.34,0.42 2012-03-28 15:47:26,87.974765945,-57.635741747,0.21,0.49,0.12,0.16,0.25,0.32,0.38 2012-03-28 15:48:52,87.962110266,-60.144521564,0.17,0.47,0.09,0.12,0.19,0.29,0.39 2012-03-28 15:50:18,87.94546311,-62.616964871,0.19,0.42,0.11,0.15,0.23,0.31,0.36 2012-03-28 15:51:46,87.925390958,-65.047451603,0.16,0.49,0.09,0.11,0.18,0.27,0.39 2012-03-28 15:53:15,87.901448825,-67.425527057,0.16,0.38,0.10,0.12,0.19,0.28,0.32 2012-03-28 15:54:44,87.874075828,-69.746993244,0.18,0.42,0.10,0.14,0.21,0.27,0.34 2012-03-28 15:56:13,87.843390324,-72.006765384,0.22,0.65,0.10,0.16,0.28,0.40,0.49 2012-03-28 15:57:41,87.809403901,-74.199344009,0.19,0.45,0.12,0.15,0.22,0.29,0.36 2012-03-28 15:59:09,87.772420638,-76.323311564,0.18,0.49,0.09,0.12,0.21,0.32,0.39 2012-03-28 16:00:37,87.732096003,-78.370181686,0.18,0.53,0.10,0.13,0.22,0.30,0.38 2012-03-28 16:02:05,87.689425639,-80.349397731,0.19,0.47,0.10,0.13,0.22,0.31,0.40 2012-03-28 16:03:34,87.644138141,-82.255212224,0.26,0.59,0.12,0.18,0.33,0.46,0.53 2012-03-28 16:05:02,87.596251642,-84.08575959,0.19,0.56,0.12,0.15,0.22,0.29,0.36 2012-03-28 16:06:30,87.545979228,-85.842635443,0.20,0.74,0.10,0.15,0.23,0.36,0.52 2012-03-28 16:07:59,87.493098159,-87.536631236,0.18,0.60,0.09,0.12,0.22,0.35,0.50 2012-03-28 16:08:50,87.4612218654,-88.4975862436,0.13,0.27,0.09,0.11,0.15,0.21,0.26