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	   gmd:Hierarchy_Level_Name:  Sea Ice Index
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	   gmd:Date_Stamp:  
	      Date:  2013-05-07
	   gmd:Metadata_Standard_Name:  ISO 19115 Geographic Information - Metadata First Edition
	   gmd:Metadata_Standard_Version:  ISO 19115:2003
	   gmd:DataSet_URI:  http://nsidc.org/data/g02135.html
	   gmd:Identification_Information:  
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	         gmd:citation:  
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	               gmd:title:  Sea Ice Index
	               gmd:date:  
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	                     gmd:date:  2002
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	               gmd:editionDate:  
	                  gmd:Date:  2002-12-05
	               gmd:identifier:  G02135
	               gmd:identifier:  http://dx.doi.org/10.7265/N5QJ7F7W
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	                              gmd:deliveryPoint:  National Snow and Ice Data Center
	                              gmd:city:  Boulder
	                              gmd:administrativeArea:  CO
	                              gmd:postalCode:  80309-0449
	                              gmd:country:  USA
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	               gmd:citedResponsibleParty:  
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	                     gmd:individualName:  NSIDC NOAA User Services
	                     gmd:organisationName:  NSIDC National Oceanic and Atmospheric Administration
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	                           gmd:address:  
	                              gmd:deliveryPoint:  National Snow and Ice Data Center
	                              gmd:city:  Boulder
	                              gmd:administrativeArea:  CO
	                              gmd:postalCode:  80309-0449
	                              gmd:country:  USA
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	         gmd:Abstract:  
	
	            The Sea Ice Index provides a quick look at sea ice changes in spatial and 
	            historical context, and gives a consistent, up-to-date source of sea ice 
	            extent and sea ice concentration values and images. The NSIDC Near-Real-Time 
	            DMSP SSM/I Daily Polar Gridded Sea Ice Concentrations and the Sea Ice 
	            Concentrations from Nimbus-7 SSMR and DMSP SSM/I Passive Microwave Data data 
	            sets are used to generate the monthly records of sea ice extent and sea ice 
	            concentration for the Arctic and Antarctica from satellite passive microwave 
	            data.

Data files tabulate monthly mean extent and area, in millions of square 
	            kilometers, by year for a given month. Plots of monthly sea ice extent 
	            anomalies with trend lines and significance intervals are available. Monthly 
	            images show sea ice extent (with an outline of the median extent for that 
	            month for comparison), sea ice concentration, trends in sea ice concentration, 
	            and anomalies in sea ice concentration. Anomalies and median extent are 
	            calculated using a reference period of 1979 through 2000.

Daily images of sea 
	            ice extent and concentration, along with a time series plot of extent for the 
	            most recent four months, can be viewed and downloaded on the data product site 
	            but are not archived. Some products are available as GIS compatible shapefiles 
	            and KML files. The Browse Image Spreadsheet Tool (BIST) can be used for 
	            animated images and for displaying archived images of extent and trends side 
	            by side, to make it easy to compare images from different years and 
	            months.

Data are stored in ASCII text, Portable Network Graphics (PNG), 
	            Keyhole Markup Language (KML), and Geospatial Vector Data format and are 
	            available from November 1978 to present via FTP or the Sea Ice Index Web site.
	         gmd:Purpose:  Scientific Research
	         gmd:Credit:  Fetterer, F., K. Knowles, W. Meier, and M. Savoie. 2002, updated 2009. Sea Ice Index. [indicate subset used]. Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N5QJ7F7W. 
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	            gmd:individualName:  Kenneth Knowles
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	            gmd:keyword:  Continent > Antarctica
	            gmd:keyword:  Geographic Region > Arctic
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