Entry_ID: MYD29
Entry_Title: MODIS/Aqua Sea Ice Extent 5-Min L2 Swath 1km
Group: Data_Set_Citation
   Dataset_Creator: Hall, D. K., V. V. Salomonson, and G. A. Riggs. 
   Dataset_Title: MODIS/Aqua Sea Ice Extent 5-Min L2 Swath 1km
   Dataset_Release_Date: 2006-12-18
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Version: 5
   Online_Resource: http://nsidc.org/data/myd29.html
End_Group
Group: Personnel
   Role: Investigator
   First_Name: George
   Middle_Name: A.
   Last_Name: Riggs
   Email: George.A.Riggs@nasa.gov
   Phone: 1 301 614-5650 
   Group: Contact_Address
      Address: NASA Goddard Space Flight Center (GSFC)
      Address: Science Systems and Applications, Inc.
      Address: NASA Goddard Space Flight Center (GSFC)
      Address: Science Systems and Applications, Inc.
      Address: Code 614.1
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Dorothy
   Middle_Name: K.
   Last_Name: Hall
   Group: Contact_Address
      Address: NASA Goddard Space Flight Center (GSFC)
      Address: National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC)
      Address: Mail stop 614.1
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Vince
   Middle_Name: V.
   Last_Name: Salomonson
   Email: vincent.salomonson@utah.edu
   Phone: 1 801 585-9492 
   Group: Contact_Address
      Address: University of Utah
      Address: Department of Meteorology
      Address: University of Utah
      Address: Department of Meteorology
      Address: 135 S 1460 E, Rm 809
      City: Salt Lake City
      Province_or_State: UT
      Postal_Code: 84112
      Country: US
   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: Ice Extent
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Ice Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Ice Extent
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Ice Temperature
End_Group
ISO_Topic_Category: Imagery/Base Maps/Earth Cover
Keyword: Antarctic
Keyword: Arctic
Keyword: Climatology
Keyword: DAAC
Keyword: EASE-Grid
Keyword: ECS
Keyword: EOSDIS
Keyword: Global Change
Keyword: Gridded
Keyword: Ice Surface Temperature
Keyword: IST
Keyword: NASA
Keyword: NSIDC
Keyword: Polar
Keyword: Remote Sensing
Keyword: Sea Ice
Keyword: Swath
Sensor_Name: MODIS > Moderate-Resolution Imaging Spectroradiometer
Sensor_Name: SPECTRORADIOMETERS
Source_Name: AQUA > Earth Observing System, AQUA
Group: Temporal_Coverage
   Start_Date: 2002-07-04
End_Group
Data_Set_Progress: in work
Group: Spatial_Coverage
   Southernmost_Latitude: -90
   Northernmost_Latitude: 90
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: GLOBAL OCEAN
End_Group
Group: Data_Resolution
   Latitude_Resolution: 1 km
   Longitude_Resolution: 1 km
   Temporal_Resolution: 00:05:00
End_Group
Project: EOSDIS > Earth Observing System Data Information System
Project: ESIP > Earth Science Information Partners Program
Group: Quality

   All MODIS/Aqua sea ice products are considered validated or at stage 2 meaning 
   that accuracy has been assessed over a widely distributed set of locations and 
   time periods via several ground-truth and validation campaigns.

   Quality indicators for MODIS sea ice data can be found in the following three 
   places:

   * AutomaticQualityFlag and the ScienceQualityFlag metadata objects and their 
   corresponding explanations: AutomaticQualityFlagExplanation and 
   ScienceQualityFlagExplanation located in the CoreMetadata.0 global attributes  
   * Custom local attributes associated with each SDS, for example Ice Surface 
   Temperature     * The Pixel QA SDS that accompanies each data field, for 
   example, Ice Surface Temperature Pixel QA.

   These quality indicators are generated during production or in post-production 
   scientific and quality checks of the data product. For more information on 
   local and global attributes, go to one of the following links:

       * MOD29 and MYD29 Local Sea Ice Attributes, Version 5     * MOD29 and 
   MYD29 Global Sea Ice Attributes, Version 5

   An AutomaticQualityFlag for each SDS is automatically set according to 
   conditions for meeting data criteria in the algorithm. In most cases, the flag 
   is set to either Passed or Suspect, and in rare instances, it may be set to 
   Failed. Suspect means that a significant percentage of the data were anomalous 
   and that further analysis should be done to determine the source of anomalies. 
   The AutomaticQualityFlagExplanation contains a brief message explaining the 
   reason for the setting of the AutomaticQualityFlag. The ScienceQualityFlag and 
   the ScienceQualityFlagExplanation maybe updated after production, either after 
   an automated QA program is run or after the data product is inspected by a 
   qualified scientist. Content and explanation of this flag are dynamic so it 
   should always be examined if present in the external metadata file. In the 
   MYD29 data product, there are two instances of the 
   ScienceQualityFlagExplanation, one for sea ice determined by reflectance data 
   and one for IST written in the metadata

   The sea ice algorithm identifies missing data and reports them in the output 
   product. Certain expected anomalous conditions may exist with the input data 
   such as a few missing lines or unusable data from the MODIS sensor. In these 
   cases, the algorithm makes no decision for an affected pixel. Summary 
   statistics are calculated for these conditions and reported as Valid EV Obs 
   Band X percent and Saturated EV Obs Band X percent local attributes. Where X 
   equals 2, 4, or 6 for Sea Ice by Reflectance and 31 or 32 for IST (Riggs, 
   Hall, and Salomonson 2003).

   The IST Pixel QA and the Sea Ice by Reflectance Pixel QA data fields provide 
   additional information on algorithm results for each pixel within a MODIS 
   scene, and are used as a measure of usefulness for sea ice data. The QA data 
   are stored as coded integer values and tells if algorithm results were 
   nominal, abnormal, or if other defined conditions were encountered for a 
   pixel. For example, intermediate checks for theoretical bounding of 
   reflectance data and the NDSI ratio are made in the algorithm. Reflectance 
   values should lie within the 0-100 percent range, and the NDSI ratio should 
   lie within the -1.0 to +1.0 range. If these limits are violated, the test for 
   sea ice is still done, but the quality flag is set to Other quality in the 
   Pixel QA field (Riggs, Hall, and Salomonson 2003).

   The NASA Goddard Space Flight Center: MODIS Land Quality Assessment Web site 
   provides updated quality information for each product.

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_Size: 0.5 - 6.0 MB
   Distribution_Format: HDF-EOS
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 0.5 - 6.0 MB
   Distribution_Format: Geographic Tagged Image File Format (GeoTIFF) (.geotiff)
End_Group
Group: Multimedia_Sample
   File: http://nsidc.org/data/modis/images/myd29.a2004036.sample.gif
   Caption: MYD29 Version 4 data, 05 February 2004
End_Group
Group: Reference

   Earth Science Data and Information System (ESDIS). 1996. EOS Ground System 
   (EGS) Systems and Operations Concept. Greenbelt, MD: Goddard Space Flight 
   Center.  Hall, Dorothy K., J. L. Foster, D. L. Verbyla, A. G. Klein, and C. S. 
   Benson. 1998. Assessment of Snow Cover Mapping Accuracy in a Variety of 
   Vegetation Cover Densities in Central Alaska. Remote Sensing of the 
   Environment 66:129-137.  Hall, Dorothy K., Jeffrey R. Key, Kimberly A. Casey, 
   George A. Riggs, and Donald Cavalieri. May 2004. Sea Ice Surface Temperature 
   Product From MODIS. IEEE Transactions on Geoscience and Remote Sensing 42:5.

   
Hall, Dorothy K. and J. Martinec. 1985. Remote Sensing of Ice and Snow. 
   London: Chapman and Hall.

   Hall, Dorothy K., George A. Riggs, and Vincent V. Salomonson. 1995. 
   Development of Methods for Mapping Global Snow Cover Using Moderate Resolution 
   Imaging Spectroradiometer (MODIS). Remote Sensing of the Environment 
   54(2):127-140.   Hall, Dorothy K., George A. Riggs, and Vincent V. Salomonson. 
   September 2001. Algorithm Theoretical Basis Document (ATBD) for the MODIS 
   Snow-, Lake Ice- and Sea Ice-Mapping Algorithms. Greenbelt, MD: Goddard Space 
   Flight Center. 

   
Hall, Dorothy K. and George A. Riggs. 2006. Assessment of Errors in the MODIS 
   Suite of Snow-Cover Products. Hydrological Processes, in press.

   
Hapke, B. 1993. Theory of Reflectance and Emittance Spectroscopy. Cambridge: 
   Cambridge University Press.

   
Key, Jeffrey R., J. B. Collins, C. Fowler, and R. S. Stone. 1997. High 
   Latitude Surface Temperature Estimates From Thermal Satellite Data. Remote 
   Sensing of the Environment 61:302-309.

   
Key, Jeffrey R., J. A. Maslanik, T. Papakyriakou, Mark C. Serreze, and A. J. 
   Schweiger. 1994. On the Validation of Satellite-Derived Sea Ice Surface 
   Temperature. Arctic 47:280-287.

   
Markham, B. L. and J. L. Barker. 1986. Landsat MSS and TM Post-Calibration 
   Dynamic Ranges, Exoatmospheric Reflectances and At-Satellite Temperatures. 
   EOSAT Technical Notes 1:3-8.

   
MODIS Characterization and Support Team (MCST). 2000. MODIS Level-1B Product 
   User's Guide for Level-1B Version 2.3.x Release 2. MCST Document 
   #MCM-PUG-01-U-DNCN.

   

   Pearson II, F. 1990. Map Projections: Theory and Applications. Boca Raton, FL. 
   CRC Press, Inc.

   
Riggs, George A., Dorothy K. Hall, and Vincent V. Salomonson. February 2003. 
   MODIS Sea Ice Products User Guide.

   
Riggs, George A., Dorothy K. Hall, and S. A. Ackerman. 1999. Sea Ice Extent 
   and Classification Mapping with the Moderate Resolution Imaging 
   Spectroradiometer Airborne Simulator. Remote Sensing of the Environment 
   68:152-163.

   
Scambos, Ted A., Terry M. Haran, and Robert Massom. In press. Validation of 
   AVHRR and MODIS Ice Surface Temperature Products Using In Situ Radiometers. 
   Annals of Glaciology 44.

   
Wiscombe, W. J. and S. G. Warren. 1980. A Model for the Spectral Albedo of 
   Snow I: Pure Snow. Journal of the Atmospheric Sciences 37:2712-2733.

End_Group
Group: Summary

   MODIS/Aqua Sea Ice Extent 5-Min L2 Swath 1km (MYD29) data set contains fields 
   for sea ice by reflectance, sea ice by reflectance pixel Quality Assessment 
   (QA), Ice Surface Temperature (IST), IST pixel QA, latitudes, and longitudes 
   in compressed Hierarchical Data Format-Earth Observing System (HDF-EOS) 
   format, along with corresponding metadata. Latitude and longitude geolocation 
   fields are at 5 km resolution, while all other fields are at 1 km resolution. 
   The sea ice algorithm uses a Normalized Difference Snow Index (NDSI) modified 
   for sea ice to distinguish sea ice from open ocean based on reflective 
   characteristics.

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/daac/modis/index.html
   Description: MODIS DAAC Web page at NSIDC
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/data/modis/
   Description: MODIS Data at NSIDC
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 Products at NSIDC
End_Group
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2006-12-18
Last_DIF_Revision_Date: 2014-12-04
DIF_Revision_History: Metadata clean-up: added spatial resolution.