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	      Date:  2014-11-23
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	         gmd:citation:  
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	               gmd:title:  Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data
	               gmd:date:  
	                  gmd:CI_Date:  
	                     gmd:date:  1996
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	                              gmd:voice:  1 303 492-6199 
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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:Abstract:  
	
	            This data set is generated from brightness temperature data derived from the 
	            following sensors: the Nimbus-7 Scanning Multichannel Microwave Radiometer 
	            (SMMR), the Defense Meteorological Satellite Program (DMSP) -F8, -F11 and -F13 
	            Special Sensor Microwave/Imagers (SSM/Is), and the DMSP-F17 Special Sensor 
	            Microwave Imager/Sounder (SSMIS). The data are provided in the polar 
	            stereographic projection at a grid cell size of 25 x 25 km.

This product is 
	            designed to provide a consistent time series of sea ice concentrations (the 
	            fraction, or percentage, of ocean area covered by sea ice) spanning the 
	            coverage of several passive microwave instruments. To aid in this goal, sea 
	            ice algorithm coefficients are changed to reduce differences in sea ice extent 
	            and area as estimated using the SMMR and SSM/I sensors. The data are generated 
	            using the NASA Team algorithm developed by the Oceans and Ice Branch, 
	            Laboratory for Hydrospheric Processes at NASA Goddard Space Flight Center 
	            (GSFC).

These data include gridded daily (every other day for SMMR data) and 
	            monthly averaged sea ice concentrations for both the north and south polar 
	            regions. The data are produced at GSFC about once per year, with roughly a 
	            one-year latency, and include data since 26 October 1978. Data are produced 
	            from SMMR brightness temperature data processed at NASA GSFC and from SSM/I 
	            and SSMIS brightness temperature data processed at the National Snow and Ice 
	            Data Center (NSIDC).

Data are scaled and stored as one-byte integers in flat 
	            binary arrays. For each data file, a corresponding PNG browse image file is 
	            provided. Data are available via FTP.
	         gmd:Purpose:  Scientific Research
	         gmd:Credit:  Cavalieri, D. J., C. L. Parkinson, P. Gloersen, and H. Zwally. 1996, updated yearly. Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data. [indicate subset used]. Boulder, Colorado USA: NASA DAAC at the National Snow and Ice Data Center. 
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	            gmd:keyword:  ESIP > Earth Science Information Partners Program
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	            gmd:keyword:  Arctic
	            gmd:keyword:  Brightness Temperature
	            gmd:keyword:  DMSP
	            gmd:keyword:  EOSDIS
	            gmd:keyword:  Gridded Data
	            gmd:keyword:  Ice
	            gmd:keyword:  Multiyear Sea Ice Concentration
	            gmd:keyword:  NIMBUS-7
	            gmd:keyword:  NSIDC DAAC
	            gmd:keyword:  Passive Microwave
	            gmd:keyword:  Polar
	            gmd:keyword:  Polar Stereographic
	            gmd:keyword:  Polynyas
	            gmd:keyword:  Remote Sensing
	            gmd:keyword:  Sea Ice
	            gmd:keyword:  Sea Ice Concentration
	            gmd:keyword:  SMMR
	            gmd:keyword:  SSM/I
	            gmd:keyword:  SSMIS
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	            gmd:MD_LegalConstraints:  
	               gmd:accessConstraints:  
	                  gmd:MD_RestrictionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_RestrictionCode" codeListValue="otherRestrictions"
	               gmd:useConstraints:  
	                  gmd:MD_RestrictionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_RestrictionCode" codeListValue="otherRestrictions"
	               gmd:otherConstraints:  
	                  Access Constraints : none
	               gmd:otherConstraints:  
	                  Use Constraints : none
	   gmd:Language:  eng; usa
	   gmd:Character_Set:  
	      gmd:MD_CharacterSetCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_CharacterSetCode" codeListValue="UTF8"
	         gmd:topicCategory:  
	            gmd:MD_topicCategoryCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_topicCategoryCode" codeListValue="climatologyMeteorologyAtmosphere"
	         gmd:topicCategory:  
	            gmd:MD_topicCategoryCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_topicCategoryCode" codeListValue="oceans"
	         gmd:Extent:  
	            gmd:EX_Extent:  
	               gmd:geographicElement:  
	                  gmd:Ex_GeographicBoundingBox:  
	                     gmd:westBoundLongitude:  -180
	                     gmd:eastBoundLongitude:  180
	                     gmd:southBoundLatitude:  -90
	                     gmd:northBoundLatitude:  90
	               gmd:temporalElement:  
	                  gmd:Ex_TemporalExtent:  
	                     gmd:extent:  
	                        gmd:TimePeriod:  
	                           gmd:beginPosition:  19781001
	                           gmd:endPosition:  20131231
	   gmd:Distribution_Information:  
	      gmd:MD_Distribution:  
	         gmd:distributor:  
	            gmd:MD_Distributor:  
	               gmd:distributorContact:  
	                  gmd:CI_ResponsibleParty:  
	                     gmd:individualName:  NSIDC DAAC User Services
	                     gmd:organisationName:  NASA DAAC at the National Snow and Ice Data Center
	                     gmd:contactInfo:  
	                        gmd:CI_Contact:  
	                           gmd:phone:  
	                              gmd:CI_Telephone:  
	                              gmd:voice:  1 303 492-6199 
	                           gmd:address:  
	                              gmd:deliveryPoint:  National Snow and Ice Data Center
	                              gmd:city:  Boulder
	                              gmd:administrativeArea:  CO
	                              gmd:postalCode:  80309-0449
	                              gmd:country:  USA
	                              gmd:electronicMailAddress:  nsidc@nsidc.org
	                           gmd:onlineResource:  
	                              gmd:CI_OnlineResource:  
	                                 gmd:linkage:  http://nsidc.org/daac/index.html
	                     gmd:role:  
	                        gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="custodian"
	               gmd:distributorContact:  
	                  gmd:CI_ResponsibleParty:  
	                     gmd:individualName:  NSIDC User Services
	                     gmd:organisationName:  National Snow and Ice Data Center
	                     gmd:contactInfo:  
	                        gmd:CI_Contact:  
	                           gmd:phone:  
	                              gmd:CI_Telephone:  
	                              gmd:voice:  1 303 492-6199 
	                           gmd:address:  
	                              gmd:deliveryPoint:  National Snow and Ice Data Center
	                              gmd:city:  Boulder
	                              gmd:administrativeArea:  CO
	                              gmd:postalCode:  80309-0449
	                              gmd:country:  USA
	                              gmd:electronicMailAddress:  nsidc@nsidc.org
	                           gmd:onlineResource:  
	                              gmd:CI_OnlineResource:  
	                                 gmd:linkage:  http://nsidc.org
	                     gmd:role:  
	                        gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="custodian"
	         gmd:distributionFormat:  
	            gmd:MD_Format:  
	               gmd:name:  
	                  gco:CharacterString:  Binary
	               gmd:version:  
	                  gco:CharacterString:  
	               gmd:specfication:  
	                  gco:CharacterString:   FTP 102.7 KB
	         gmd:distributionFormat:  
	            gmd:MD_Format:  
	               gmd:name:  
	                  gco:CharacterString:  Binary
	               gmd:version:  
	                  gco:CharacterString:  
	               gmd:specfication:  
	                  gco:CharacterString:   FTP 133.3 KB
	         gmd:distributionFormat:  
	            gmd:MD_Format:  
	               gmd:name:  
	                  gco:CharacterString:  PNG
	               gmd:version:  
	                  gco:CharacterString:  
	               gmd:specfication:  
	                  gco:CharacterString:   FTP 300 KB
	         gmd:transferOptions:  
	            gmd:MD_DigitalTransferOptions:  
	               gmd:onLine:  
	                  gmd:CI_OnlineResource:  
	                     gmd:linkage:  ftp://sidads.colorado.edu/pub/DATASETS/nsidc0051_gsfc_nasateam_seaice/
	                     gmd:description:  Data Access URL
	                     gmd:function:  
	                        gmd:CI_OnLineFunctionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue=download
	                  gmd:CI_OnlineResource:  
	                     gmd:linkage:  
	                     gmd:description:  
	                     gmd:function:  
	                        gmd:CI_OnLineFunctionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue=
	                  gmd:CI_OnlineResource:  
	                     gmd:linkage:  http://nsidc.org/data/docs/daac/nsidc0051_gsfc_seaice.gd.html
	                     gmd:description:  Documentation URL
	                     gmd:function:  
	                        gmd:CI_OnLineFunctionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue=information
	               gmd:offLine:  
	                  gmd:MD_Medium:  
	                     gmd:name:  
	                        gmd:MD_MediumNameCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_MediumNameCode" codeListValue="onLine"
	                     gmd:density:  102.7 
	                     gmd:densityUnits:  B
	                     gmd:mediumName:  FTP
	   gmi:Acquisition_Information:  
	      gmi:MI_Acquisition:  
	         gmi:instrument:  
	            gmi:MI_Instrument:  
	               gmi:identifier:  
	                  gmd:MD_Identifier:  
	                     gmd:code:  
	                        gco:CharacterString:  SMMR > Scanning Multichannel Microwave Radiometer
	               gmi:type:  
	                  gco:CharacterString:  sensor
	         gmi:instrument:  
	            gmi:MI_Instrument:  
	               gmi:identifier:  
	                  gmd:MD_Identifier:  
	                     gmd:code:  
	                        gco:CharacterString:  SSM/I > Special Sensor Microwave/Imager
	               gmi:type:  
	                  gco:CharacterString:  sensor
	         gmi:instrument:  
	            gmi:MI_Instrument:  
	               gmi:identifier:  
	                  gmd:MD_Identifier:  
	                     gmd:code:  
	                        gco:CharacterString:  SSMIS > Special Sensor Microwave Imager/Sounder
	               gmi:type:  
	                  gco:CharacterString:  sensor
	         gmi:platform:  
	            gmi:MI_Platform:  
	               gmi:identifier:  
	                  gmd:MD_Identifier:  
	                     gmd:code:  
	                        gco:CharacterString:  DMSP 5D-2/F11 > Defense Meteorological Satellite Program-F11
	               gmi:description:  
	                  gco:CharacterString:  satellite
	               gmi:instrument:  
	                  gco:CharacterString:  N/A
	         gmi:platform:  
	            gmi:MI_Platform:  
	               gmi:identifier:  
	                  gmd:MD_Identifier:  
	                     gmd:code:  
	                        gco:CharacterString:  DMSP 5D-2/F13 > Defense Meteorological Satellite Program-F13
	               gmi:description:  
	                  gco:CharacterString:  satellite
	               gmi:instrument:  
	                  gco:CharacterString:  N/A
	         gmi:platform:  
	            gmi:MI_Platform:  
	               gmi:identifier:  
	                  gmd:MD_Identifier:  
	                     gmd:code:  
	                        gco:CharacterString:  DMSP 5D-2/F8 > Defense Meteorological Satellite Program-F8
	               gmi:description:  
	                  gco:CharacterString:  satellite
	               gmi:instrument:  
	                  gco:CharacterString:  N/A
	         gmi:platform:  
	            gmi:MI_Platform:  
	               gmi:identifier:  
	                  gmd:MD_Identifier:  
	                     gmd:code:  
	                        gco:CharacterString:  DMSP 5D-3/F17 > Defense Meteorological Satellite Program-F17
	               gmi:description:  
	                  gco:CharacterString:  satellite
	               gmi:instrument:  
	                  gco:CharacterString:  N/A
	         gmi:platform:  
	            gmi:MI_Platform:  
	               gmi:identifier:  
	                  gmd:MD_Identifier:  
	                     gmd:code:  
	                        gco:CharacterString:  NIMBUS-7
	               gmi:description:  
	                  gco:CharacterString:  satellite
	               gmi:instrument:  
	                  gco:CharacterString:  N/A