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MODIS/Aqua Sea Ice Extent 5-Min L2 Swath 1km, Version 5

Entry ID: MYD29V5

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Summary

Abstract: 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 ...

Related URL

Link: VIEW PROJECT HOME PAGE

Description: MODIS DAAC Web page at NSIDC

Multimedia Sample

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Caption: MYD29 Version 4 data, 05 February 2004

Geographic Coverage

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Spatial coordinates

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 Sea Ice Extent 5-Min L2 Swath 1km, Version 5

Dataset Release Date: 2006-12-18

Dataset Release Place: Boulder, CO

Dataset Publisher: National Snow and Ice Data Center (NSIDC)

Version: 5

Online Resource: http://nsidc.org/data/myd29v5.html

Temporal Coverage

Start Date: 2002-07-04

Location Keywords

GEOGRAPHIC REGION > GLOBAL OCEAN

Data Resolution

Temporal Resolution: 5-min

Science Keywords

CRYOSPHERE > SEA ICE > ICE EXTENT

CRYOSPHERE > SEA ICE > ICE TEMPERATURE

OCEANS > SEA ICE > ICE EXTENT

OCEANS > SEA ICE > ICE TEMPERATURE

ISO Topic Category

IMAGERY/BASE MAPS/EARTH COVER

Platform

AQUA > Earth Observing System, AQUA

Instrument

MODIS > Moderate-Resolution Imaging Spectroradiometer

Spectroradiometers

Project

EOSDIS > Earth Observing System Data Information System

ESIP > Earth Science Information Partners Program

CWIC > CEOS WGISS Integrated Catalog

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.

Ancillary Keywords

Antarctic

Arctic

Data Set Progress

IN WORK

Originating Center

NSIDC_DAAC

Data Center

NSIDC Distributed Active Archive Center

Data Center URL: http://nsidc.org/daac/index.html
Dataset ID: MYD293, MYD294

Data Center Personnel
Name: NSIDC USER SERVICES Phone: +1 (303) 492-6199 Fax: +1 (303) 492-2468 Email: nsidc at nsidc.org Contact Address: National Snow and Ice Data Center CIRES, 449 UCB University of Colorado City: Boulder Province or State: CO Postal Code: 80309-0449 Country: USA

National Snow and Ice Data Center

Data Center URL: http://nsidc.org
Dataset ID: MYD293, MYD294

Data Center Personnel
Name: NSIDC USER SERVICES Phone: +1 (303) 492-6199 Fax: +1 (303) 492-2468 Email: nsidc at nsidc.org Contact Address: National Snow and Ice Data Center CIRES, 449 UCB University of Colorado City: Boulder Province or State: CO Postal Code: 80309-0449 Country: USA

Distribution

Distribution Media: FTP

Distribution Size: 0.5 - 6.0 MB

Distribution Format: GeoTIFF

Distribution Media: FTP

Distribution Size: 0.5 - 6.0 MB

Distribution Format: HDF-EOS

Personnel

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

Publications/References

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.

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Extended Metadata Properties

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Creation and Review Dates

DIF Creation Date: 2008-03-26

Last DIF Revision Date: 2012-05-04

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