ERDDAP > info > noaa_lsa_surface_elevation_icebridge

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
		data	graph		files	Sea Ice Surface Elevation from IceBridge ATM LIDAR, Arctic, from 2009 to 2018 Airborne Surveys		F   I   M	background			NOAA NESDIS STAR	noaa_lsa_surface_elevation_icebridge

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	defaultGraphQuery	String	longitude%2Clatitude%2CElevation%26time%3E%3D2018-04-10T00%3A00%3A00Z%26time%3C%3D2018-04-17T00%3A00%3A00Z%26.draw=markers%26t.marker=6%7C%26.color=0x000000%26.colorBar=KT_amp%7C%7C%7C%7C%7C
attribute	NC_GLOBAL	Easternmost_Easting	double	179.9947664
attribute	NC_GLOBAL	geospatial_lat_max	double	89.99707309
attribute	NC_GLOBAL	geospatial_lat_min	double	67.23399119
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	179.9947664
attribute	NC_GLOBAL	geospatial_lon_min	double	-179.99844221
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	infoUrl	String	https://www.star.nesdis.noaa.gov/sod/lsa/SeaIce/SurfaceElevation.php
attribute	NC_GLOBAL	institution	String	NOAA NESDIS STAR
attribute	NC_GLOBAL	keywords	String	along, along-track, Along_track_Distance, Along_Track_Grid_Cell_Number, cell, data, deviation, distance, elevation, grid, latitude, local, longitude, num, Num_Pts, number, pts, source, standard, Standard_Deviation, statistics, time, time2, track
attribute	NC_GLOBAL	license	String	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	89.99707309
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	67.23399119
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v70
attribute	NC_GLOBAL	summary	String	This dataset contains the NOAA / NESDIS / STAR / LSA Polar Ocean Data System (PODS) Arctic Gridded Surface Elevation Product. The Gridded Surface Elevation 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 elevation while still containing enough point measurements for robust statistical calculations. 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/SurfaceElevation.php
attribute	NC_GLOBAL	time_coverage_end	String	2018-04-16T16:30:20.114Z
attribute	NC_GLOBAL	time_coverage_start	String	2009-03-31T12:28:04.781Z
attribute	NC_GLOBAL	title	String	Sea Ice Surface Elevation from IceBridge ATM LIDAR, Arctic, from 2009 to 2018 Airborne Surveys
attribute	NC_GLOBAL	Westernmost_Easting	double	-179.99844221
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.238502484781E9, 1.523896220114E9
attribute	time	axis	String	T
attribute	time	comment	String	Time (seconds since 1970-01-01T00:00:00.000Z), minimum time of all ATM point measurements within 10 across-track grid cells"
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	1970-01-01T00:00:00.000Z
attribute	time	units	String	seconds since 1970-01-01T00:00:00Z
variable	Along_track_Distance		float
attribute	Along_track_Distance	actual_range	float	1000.0, 2002000.0
attribute	Along_track_Distance	comment	String	Along-track distance (meters), relative to the beginning of the flight line
attribute	Along_track_Distance	ioos_category	String	Unknown
attribute	Along_track_Distance	long_name	String	Along-track Distance
attribute	Along_track_Distance	units	String	meters
variable	Across_Track_Grid_Cell_Number		byte
attribute	Across_Track_Grid_Cell_Number	_FillValue	byte	127
attribute	Across_Track_Grid_Cell_Number	actual_range	byte	1, 10
attribute	Across_Track_Grid_Cell_Number	colorBarMaximum	double	100.0
attribute	Across_Track_Grid_Cell_Number	colorBarMinimum	double	0.0
attribute	Across_Track_Grid_Cell_Number	ioos_category	String	Statistics
attribute	Across_Track_Grid_Cell_Number	long_name	String	Cross-Track Grid Cell Number
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	_FillValue	double	NaN
attribute	longitude	actual_range	double	-179.99844221, 179.9947664
attribute	longitude	axis	String	X
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	comment	String	Longitude (degrees), mean longitude of ATM point measurements within grid cell
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	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	actual_range	double	67.23399119, 89.99707309
attribute	latitude	axis	String	Y
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	comment	String	Latitude (degrees), mean latitude of ATM point measurements within grid cell
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	Elevation		float
attribute	Elevation	_FillValue	float	NaN
attribute	Elevation	actual_range	float	-16.521, 50.0
attribute	Elevation	comment	String	Elevation (meters, relative to WGS84 ellipsoid), mean elevation of ATM elevation point measurements within grid cell
attribute	Elevation	ioos_category	String	Location
attribute	Elevation	long_name	String	Elevation
attribute	Elevation	units	String	meters
variable	Standard_Deviation		float
attribute	Standard_Deviation	_FillValue	float	NaN
attribute	Standard_Deviation	actual_range	float	0.0, 4.3024
attribute	Standard_Deviation	colorBarMaximum	double	50.0
attribute	Standard_Deviation	colorBarMinimum	double	0.0
attribute	Standard_Deviation	comment	String	Standard Deviation (meters), standard deviation of ATM elevation point measurements within grid cell
attribute	Standard_Deviation	ioos_category	String	Statistics
attribute	Standard_Deviation	long_name	String	Standard Deviation
attribute	Standard_Deviation	units	String	meters
variable	Num_Pts		float
attribute	Num_Pts	actual_range	float	0.0, 1543.0
attribute	Num_Pts	comment	String	Number of ATM point measurements within grid cell
attribute	Num_Pts	ioos_category	String	Unknown
attribute	Num_Pts	long_name	String	Number of Points

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.