Related URL

Link: GET DATA > LANCE Description: NASA LANCE Near Real Time Data Products Link: GET DATA > ECHO Description: Refine your granule search with ECHO's next generation Earth Science discovery tool (Reverb) using information from this record.

Geographic Coverage

N: 90.0

S: -90.0

E: 180.0

W: -180.0

Data Set Citation

Dataset Originator/Creator: D. Hall, V. Salomonson Dataset Title: MODIS/Aqua Coarse Sea Ice Extent 5-Min L2 Swath 5km, Version 5 Dataset Release Date: 2011-02-16 Dataset Release Place: Greenbelt, MD Dataset Publisher: MODAPS Version: 5 Online Resource: http://lance.nasa.gov/data-products/modis-products/

Temporal Coverage

Start Date: 2011-02-16

Location Keywords

GEOGRAPHIC REGION > GLOBAL OCEAN

Data Resolution

Latitude Resolution: 5 km Longitude Resolution: 5 km Temporal Resolution: 5 minutes

Science Keywords

CRYOSPHERE >SEA ICE >ICE EXTENT    [Definition]

CRYOSPHERE >SEA ICE >ICE TEMPERATURE    [Definition]

OCEANS >SEA ICE >ICE EXTENT    [Definition]

OCEANS >SEA ICE >ICE TEMPERATURE    [Definition]

ISO Topic Category

IMAGERY/BASE MAPS/EARTH COVER

Platform

AQUA >Earth Observing System, AQUA    [Information]

Instrument

MODIS >Moderate-Resolution Imaging Spectroradiometer    [Information]

Spectroradiometers    [Information]

Project

EOSDIS >Earth Observing System Data Information System    [Information]

ESIP >Earth Science Information Partners Program    [Information]

Quality

All MODIS/Terra 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 Scientific Data Set (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.

Keywords

Antarctic

Arctic

Climatology

DAAC

EASE-Grid

ECS

EOSDIS

Global Change

Gridded

Ice Surface Temperature

IST

NASA

NSIDC

Remote Sensing

Sea Ice

Swath

LANCE

Data Set Progress

IN WORK

Data Center

MODIS Adaptive Processing System, Biospheric Information Systems Branch, Hydrospheric and Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information] Data Center URL: http://modaps.nascom.nasa.gov Data Center Personnel Name: MODAPS OPERATION TEAM Phone: 301-352-2101 Email: barbara.deshong at sigmaspace.com

Distribution

Distribution_Media: FTP Distribution_Format: HDF-EOS

Personnel

DOROTHY K. HALL Role: INVESTIGATOR Contact Address: National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC) Mail stop 614.1 City: Greenbelt Province or State: MD Postal Code: 20771

VINCE V. SALOMONSON Role: INVESTIGATOR Phone: 801-585-9492 Email: vincent.salomonson at utah.edu Contact Address: University of Utah Department of Meteorology 135 S 1460 E, Rm 809 City: Salt Lake City Province or State: UT Postal Code: 84112 Country: US

GEORGE A. RIGGS Role: INVESTIGATOR Phone: 301-614-5650 Email: George.A.Riggs at nasa.gov Contact Address: NASA Goddard Space Flight Center (GSFC) Science Systems and Applications, Inc. Code 614.1 City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA