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     data   graph     files  Sea Ice Surface Roughness from IceBridge ATM LIDAR, Arctic, 10km, from 2009 to 2018 Airborne
Surveys
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL cdm_data_type String Point
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_name String NOAA
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://star.nesdis.noaa.gov/socd/lsa (external link)
attribute NC_GLOBAL defaultGraphQuery String time%2CSurface_roughness_99th_percentile%2C&time>=2018-04-10T00%3A00%3A00Z&time%3C%3D2018-04-17T00%3A00%3A00Z&.draw=markers&.marker=5%7C5&.color=0x000000
attribute NC_GLOBAL Easternmost_Easting double 179.832076042
attribute NC_GLOBAL featureType String Point
attribute NC_GLOBAL geospatial_lat_max double 89.975968808
attribute NC_GLOBAL geospatial_lat_min double 67.27580708
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double 179.832076042
attribute NC_GLOBAL geospatial_lon_min double -179.841429911
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://star.nesdis.noaa.gov/socd/lsa/SeaIce/SeaIceSurfaceRoughness.php (external link)
attribute NC_GLOBAL institution String NOAA NESDIS STAR
attribute NC_GLOBAL keywords String Earth Science > Climate Indicators > Cryospheric Indicators, Earth Science > Climate Indicators > Cryospheric Indicators > Sea Ice Elevation, Earth Science > Cryosphere > Sea Ice, Earth Science > Cryosphere > Sea Ice> Sea Ice Elevation, Surface Roughness
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String 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

The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy,completeness, or usefulness, of this information.
attribute NC_GLOBAL Northernmost_Northing double 89.975968808
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 67.27580708
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String 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.

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
attribute NC_GLOBAL time_coverage_end String 2018-04-16T16:30:01Z
attribute NC_GLOBAL time_coverage_start String 2009-03-31T12:28:41Z
attribute NC_GLOBAL title String Sea Ice Surface Roughness from IceBridge ATM LIDAR, Arctic, 10km, from 2009 to 2018 Airborne Surveys
attribute NC_GLOBAL Westernmost_Easting double -179.841429911
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.238502521E9, 1.523896201E9
attribute time axis String T
attribute time ioos_category String Time
attribute time long_name String Time
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time time_precision String 1970-01-01T00:00:00Z
attribute time units String seconds since 1970-01-01T00:00:00Z
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude actual_range double 67.27580708, 89.975968808
attribute latitude axis String Y
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude comment String The average latitude of measurements in the 10km segment
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude   double  
attribute longitude _CoordinateAxisType String Lon
attribute longitude actual_range double -179.841429911, 179.832076042
attribute longitude axis String X
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude comment String The average longitude of measurements in the 10km segment
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable Mean_surface_roughness   float  
attribute Mean_surface_roughness actual_range float 0.02, 0.77
attribute Mean_surface_roughness comment String Arithmetic mean of all surface roughness measurements in 10km segment
attribute Mean_surface_roughness ioos_category String Surface Waves
attribute Mean_surface_roughness long_name String Mean Surface Roughness
attribute Mean_surface_roughness units String Meters
variable Maximum_surface_roughness   float  
attribute Maximum_surface_roughness actual_range float 0.04, 3.71
attribute Maximum_surface_roughness comment String Maximum value of surface roughness in 10km segment
attribute Maximum_surface_roughness ioos_category String Surface Waves
attribute Maximum_surface_roughness long_name String Maximum Surface Roughness
attribute Maximum_surface_roughness units String Meters
variable Surface_roughness_5th_percentile   float  
attribute Surface_roughness_5th_percentile actual_range float 0.0, 0.48
attribute Surface_roughness_5th_percentile colorBarMaximum double 100.0
attribute Surface_roughness_5th_percentile colorBarMinimum double 0.0
attribute Surface_roughness_5th_percentile comment String 5th percentile height of all surface roughness measurements in 10km segment
attribute Surface_roughness_5th_percentile ioos_category String Surface Waves
attribute Surface_roughness_5th_percentile long_name String Surface Roughness 5th Percentile
attribute Surface_roughness_5th_percentile units String Meters
variable Surface_roughness_25th_percentile   float  
attribute Surface_roughness_25th_percentile actual_range float 0.01, 0.63
attribute Surface_roughness_25th_percentile colorBarMaximum double 100.0
attribute Surface_roughness_25th_percentile colorBarMinimum double 0.0
attribute Surface_roughness_25th_percentile comment String 25th percentile height of all surface roughness measurements in 10km segment
attribute Surface_roughness_25th_percentile ioos_category String Surface Waves
attribute Surface_roughness_25th_percentile long_name String Surface Roughness 25th Percentile
attribute Surface_roughness_25th_percentile units String Meters
variable Surface_roughness_75th_percentile   float  
attribute Surface_roughness_75th_percentile actual_range float 0.03, 0.91
attribute Surface_roughness_75th_percentile colorBarMaximum double 100.0
attribute Surface_roughness_75th_percentile colorBarMinimum double 0.0
attribute Surface_roughness_75th_percentile comment String 75th percentile height of all surface roughness measurements in 10km segment
attribute Surface_roughness_75th_percentile ioos_category String Surface Waves
attribute Surface_roughness_75th_percentile long_name String Surface Roughness 75th Percentile
attribute Surface_roughness_75th_percentile units String Meters
variable Surface_roughness_95th_percentile   float  
attribute Surface_roughness_95th_percentile actual_range float 0.03, 1.17
attribute Surface_roughness_95th_percentile colorBarMaximum double 100.0
attribute Surface_roughness_95th_percentile colorBarMinimum double 0.0
attribute Surface_roughness_95th_percentile comment String 95th percentile height of all surface roughness measurements in 10km segment
attribute Surface_roughness_95th_percentile ioos_category String Surface Waves
attribute Surface_roughness_95th_percentile long_name String Surface Roughness 95th Percentile
attribute Surface_roughness_95th_percentile units String Meters
variable Surface_roughness_99th_percentile   float  
attribute Surface_roughness_99th_percentile actual_range float 0.03, 1.75
attribute Surface_roughness_99th_percentile colorBarMaximum double 100.0
attribute Surface_roughness_99th_percentile colorBarMinimum double 0.0
attribute Surface_roughness_99th_percentile comment String 99th percentile height of all surface roughness measurements in 10km segment
attribute Surface_roughness_99th_percentile ioos_category String Surface Waves
attribute Surface_roughness_99th_percentile long_name String Surface Roughness 99th Percentile
attribute Surface_roughness_99th_percentile units String Meters

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.


 
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