Entry_ID: NSIDC-0081
Entry_Title: Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Sea Ice Concentrations
Group: Data_Set_Citation
   Dataset_Creator: Maslanik, J. and J. Stroeve. 
   Dataset_Title: Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Sea Ice Concentrations
   Dataset_Release_Date: 1999-01-01updated daily
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0081.html
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Jim
   Last_Name: Maslanik
   Email: nsidc@kryos.colorado.edu
   Phone: 1 303 492-6199 
   Fax: 1 303  492-2468 
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Jim
   Last_Name: Maslanik
   Email: nsidc@kryos.colorado.edu
   Phone: 1 303 492-6199 
   Fax: 1 303  492-2468 
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Julienne
   Last_Name: Stroeve
   Email: stroeve@nsidc.org
   Group: Contact_Address
      Address: CIRES
      Address: National Snow and Ice Data Center
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Kenneth
   Last_Name: Knowles
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Walt
   Last_Name: Meier
   Email: walter.n.meier@nasa.gov
   Group: Contact_Address
      Address: NASA Goddard Space Flight Center
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Donald
   Middle_Name: J.
   Last_Name: Cavalieri
   Email: Donald.J.Cavalieri@nasa.gov
   Phone: 1 301 614-5901 x
   Fax: 1 301  614-5644 x
   Group: Contact_Address
      Address: NASA Goddard Space Flight Center
      Address: Laboratory for Hydrospheric Processes
      Address: NASA/GSFC
      Address: Mail Code: 615
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: NSIDC
   Last_Name: User Services
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2468 x
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Sea Ice Concentration
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Sea Ice Concentration
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Sea Ice Concentration
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Sea Ice Concentration
End_Group
ISO_Topic_Category: Climatology/Meteorology/Atmosphere
ISO_Topic_Category: Oceans
Keyword: Antarctic
Keyword: Arctic
Keyword: DMSP
Keyword: Gridded Data
Keyword: Ice
Keyword: Ice Concentration
Keyword: Near Real-time
Keyword: Passive Microwave
Keyword: Polar
Keyword: Polar Stereographic
Keyword: Remote Sensing
Keyword: Sea Ice
Keyword: Sea Ice Concentration
Keyword: SMMR
Keyword: Special Sensor Microwave Imager/Sounder
Keyword: SSM/I
Keyword: SSMIS
Sensor_Name: SSM/I > Special Sensor Microwave/Imager
Sensor_Name: SSMIS > Special Sensor Microwave Imager/Sounder
Source_Name: DMSP 5D-2/F13 > Defense Meteorological Satellite Program-F13
Source_Name: DMSP 5D-2/F15 > Defense Meteorological Satellite Program-F15
Source_Name: DMSP 5D-3/F17 > Defense Meteorological Satellite Program-F17
Group: Temporal_Coverage
   Start_Date: 2013-10-01
   Stop_Date: 2014-09-29
End_Group
Group: Temporal_Coverage
   Start_Date: 2013-10-01
   Stop_Date: 2014-09-29
End_Group
Data_Set_Progress: in work
Group: Spatial_Coverage
   Southernmost_Latitude: -90
   Northernmost_Latitude: -39.23
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Spatial_Coverage
   Southernmost_Latitude: 30.98
   Northernmost_Latitude: 90
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: ANTARCTICA
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: ARCTIC
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: POLAR
End_Group
Group: Data_Resolution
   Latitude_Resolution: 25 km
   Longitude_Resolution: 25 km
   Temporal_Resolution: 1 day
End_Group
Project: EOSDIS > Earth Observing System Data Information System
Project: ESIP > Earth Science Information Partners Program
Group: Quality

   This near-real-time sea ice concentration (NRTSI) data set is created using 
   brightness temperatures from NOAA's Comprehensive Large Array-data Stewardship 
   System (CLASS) in order to provide the product within one to two days 
   following data acquisition. These brightness temperatures do not receive the 
   same level of quality control as the DMSP SSM/I-SSMIS Daily Polar Gridded 
   Brightness Temperatures product created at NSIDC.

   Additionally, these NRTSI data may be missing swaths and contain erroneous ice 
   over ocean that was missed by the weather filters.

End_Group
Group: Use_Constraints

   These data are intended to facilitate time-sensitive research dependent upon 
   precise detection of seasonal polar sea ice formation and break up. These data 
   are primarily meant to provide a best estimate of current ice and snow 
   conditions based on information and algorithms available at the time the data 
   are acquired. Near-real-time products are not intended for operational use in 
   assessing sea ice conditions for navigation and should be used with caution in 
   extending the sea ice time series. For historical SMMR and SSM/I sea ice 
   concentration data, please see Sea Ice Concentrations from Nimbus-7 SMMR and 
   DMSP SSM/I Passive Microwave Data.

End_Group
Data_Set_Language: English
Originating_Center: NSIDC_DAAC
Group: Data_Center
   Data_Center_Name: NASA DAAC > NASA DAAC at the National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org/daac/index.html
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Data_Center
   Data_Center_Name: NSIDC > National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Format: PNG
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 102.7 KB
   Distribution_Format: Binary
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 133.3 KB
   Distribution_Format: Binary
End_Group
Group: Reference

   Cavalieri, D. J., P. Gloersen, and W. J. Campbell. 1984. Determination of Sea 
   Ice Parameters with the NIMBUS-7 SMMR. Journal of Geophysical Research 
   89(D4):5355-5369.

   Cavalieri, D. J., C. I. Parkinson, P. Gloersen, and H. J. Zwally. 1997. Arctic 
   and Antarctic Sea Ice Concentrations from Multichannel Passive-Microwave 
   Satellite Data Sets: October 1978 to December 1996, User's Guide. NASA 
   Technical Memorandum 104647. 17 pages.

   For a complete list of references, see the References and Related Publications 
   section in the documentation for NSIDC's Sea Ice Concentrations from Nimbus-7 
   SMMR and DMSP SSM/I Passive Microwave Data.

End_Group
Group: Summary

   









 This data set provides a 
   near-real-time (NRT) map of sea ice concentrations for both the Northern and 
   Southern Hemispheres. The near-real-time passive microwave brightness 
   temperature data are acquired with the Special Sensor Microwave Imager/Sounder 
   (SSMIS) on board the Defense Meteorological Satellite Program (DMSP) F17 
   satellite. The SSMIS instrument is the next generation Special Sensor 
   Microwave/Imager (SSM/I) instrument. SSMIS data are received daily from the 
   Comprehensive Large Array-data Stewardship System (CLASS) at the National 
   Oceanic and Atmospheric Administration (NOAA) and are gridded onto a polar 
   stereographic grid. Investigators generate sea ice concentrations from these 
   data using the NASA Team algorithm.

   These data are stored as one-byte flat scaled binary arrays with one byte per 
   pixel, at a resolution of 25 km. For each data file, a corresponding PNG image 
   file is provided. These data are available via FTP for the most recent three 
   to six months and are retained on the FTP site until NSIDC's Sea Ice 
   Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data 
   (preliminary data) become available for the same time period.

   These data are primarily meant to provide a best estimate of current ice and 
   snow conditions based on information and algorithms available at the time the 
   data are acquired. Near-real-time products are not intended for operational 
   use in assessing sea ice conditions for navigation and should be used with 
   caution in extending the sea ice time series in NSIDC's Sea Ice Concentrations 
   from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data.

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/data/seaice/
   Description: Sea Ice Data at NSIDC
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/nise1.html
   Description: Near-Real-Time SSM/I EASE-Grid Daily Global Ice Concentration and Snow Extent
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/nsidc-0051.html
   Description: Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/g02135.html
   Description: Sea Ice Index
End_Group
IDN_Node: USA/NASA
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 1999-01-01
Last_DIF_Revision_Date: 2014-08-28
DIF_Revision_History:  Removed the sample images on the URLs page.