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NASA SCP Arctic and Antarctic Ice Extent from QuikSCAT, 1999-2009

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Identification Information:

Dataset Identifier:

NSIDC-0265

Citation:

Citation Information:

Originator: Long, D. G.
Publication Date: 20130403
Title: NASA SCP Arctic and Antarctic Ice Extent from QuikSCAT, 1999-2009
Edition: 2
Publication Information:
Publication Place: Boulder, Colorado USA
Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data Center
Online Linkage: http://nsidc.org/data/nsidc-0265.html

Description:

Abstract:

This data set provides sea ice extent for the Arctic (60-90 degrees North) and Antarctic (52-90 degrees South) in Scatterometer Image Reconstruction (SIR) binary image format, along with ASCII text files containing latitude and longitude coordinates along the sea ice edge, and browse images of SIR files in Graphics Interchange Format (GIF) format. Ancillary products include daily-averaged total sea ice extent in ASCII format. Estimates of sea ice extent were produced from daily-averaged QuikSCAT sigma-0 measurements and extend from 19 July 1999 to 31 December 2009.

QuikSCAT obtains 12 individual radar normalized backscatter (sigma-0) measurements, called slices, for each footprint as it scans over a 1800 km wide swath. Slices are typically 4 to 6 km long by 20 km wide. The summed measurements of the slices are called egg measurements. The effective resolution and shape of each egg measurement is approximately 20 by 30 km, depending on the antenna beam and instrument mode. This data set contains both slice and egg images for each day.

The Microwave Earth Remote Sensing (MERS) group at Brigham Young University (BYU) developed a SIR-with-filtering (SIRF) algorithm that combines forward- and aft-looking sigma-0 measurements to produce enhanced-resolution backscatter images over various azimuth angles. The polarization ratio, incidence angle dependence, and the sigma-0 estimate error standard deviation were used to discriminate between sea ice and ocean. Sea ice extent was estimated for both slice and egg images. The nominal pixel resolution of the slice images is 2.225 km with an estimated effective resolution of approximately 4 km. Egg images have a nominal pixel resolution of 4.45 km with an estimated effective resolution of approximately 8 to 10 km.

Data and browse images are available via FTP, along with C, Fortran, and Interactive Data Language (IDL) tools to read and display the SIR images.

Purpose: scientific research

Documentation:

User's Guide:

Citation Information:

Originator: Long, D. G.
Publication Date: 20130403
Title: NASA SCP Arctic and Antarctic Ice Extent from QuikSCAT, 1999-2009
Publication Information:
Publication Place: Boulder, Colorado USA
Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data Center
Online Linkage: http://nsidc.org/data/docs/daac/nsidc0265_scatterometry_ice_extent.gd.html

Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 19990719
Ending Date: 20091231

Currentness Reference: publication date

Status:

Progress: Complete
Maintenance and Update Frequency: Unknown

Spatial Domain:

Bounding Coordinates:

 

West Bounding Coordinate: -180°
East Bounding Coordinate: 180°
North Bounding Coordinate: 90°
South Bounding Coordinate: -90°

Keywords:

Theme:

Theme Keyword Thesaurus: NASA Global Change Master Directory (GCMD) Science Keywords
Theme Keyword: EARTH SCIENCE Cryosphere Sea Ice Ice Extent
Theme Keyword: EARTH SCIENCE Cryosphere Sea Ice Ice Extent
Theme Keyword: EARTH SCIENCE Oceans Sea Ice Ice Extent
Theme Keyword: EARTH SCIENCE Oceans Sea Ice Ice Extent

Theme:

Theme Keyword Thesaurus: NASA Global Change Master Directory (GCMD) Project Keywords
Theme Keyword: SCP NASA Scatterometer Climate Record Pathfinder

Theme:

Theme Keyword Thesaurus: NASA Global Change Master Directory (GCMD) Instrument Keywords
Theme Keyword: SCATTEROMETERS
Theme Keyword: SEAWINDS SeaWinds

Theme:

Theme Keyword Thesaurus: NASA Global Change Master Directory (GCMD) Platform Keywords
Theme Keyword: QUIKSCAT Quick Recovery Scatterometer
Theme Keyword: SATELLITES

Theme:

Theme Keyword Thesaurus: ISO 19115 Topic Categories
Theme Keyword: climatologyMeteorologyAtmosphere

Theme:

Theme Keyword Thesaurus: None
Theme Keyword: DAAC
Theme Keyword: ice sheets
Theme Keyword: Ku- band radar
Theme Keyword: LANDFORMS
Theme Keyword: NASA
Theme Keyword: NSIDC DAAC
Theme Keyword: NSIDC National Snow and Ice Data Center
Theme Keyword: QuikSCAT
Theme Keyword: Satellite Radar Data
Theme Keyword: Scatterometer
Theme Keyword: SCP Scatterometer Climate Record Pathfinder
Theme Keyword: Sea Ice Extent

Place:

Place Keyword Thesaurus: NASA Global Change Master Directory (GCMD) Location Keywords
Place Keyword: Continent Antarctica
Place Keyword: Geographic Region Arctic

Access Constraints:

None

Use Constraints:

Any use of images or data should include the following acknowledgement and citations: 'Ice extent images (or maps) are courtesy of David G. Long at Brigham Young University, generated by the Scatterometer Climate Record Pathfinder project from data obtained from the PO.DAAC.'

Early, D.S., and and D.G. Long. 2001. Image reconstruction and enhanced resolution imaging from irregular samples. IEEE Transactions on Geoscience and Remote Sensing 39(2): 291-302. Long, D.G. 2004. NASA SCP arctic and antarctic ice extent from QuikSCAT, 1999-2004. Boulder, CO, USA: National Snow and Ice Data Center. Digital media. Remund, Q.P., and D.G. Long. 1999. Sea ice extent mapping using Ku-band scatterometer data. Journal of Geophysical Research 104(C5): 11515-11527. Please send reprints of papers, reports, or presentations using these data to NSIDC User Services, the Physical Oceanography Distributed Active Archive Center (PO.DAAC) and David Long.

Point of Contact:

Contact Information:

Contact Person Primary:

Contact Person: NSIDC User Services
Contact Organization: National Snow and Ice Data Center

Contact Address:

Address Type: mailing
Address:
  • CIRES, 449 UCB
  • University of Colorado
City: Boulder
State or Province: CO
Postal Code: 80309-0449
Country: USA

Contact Voice Telephone: 1 303 492-6199 x
Contact Facsimile Telephone: 1 303 492-2468 x
Contact Electronic Mail Address: nsidc@nsidc.org

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Distribution Information:

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: National Snow and Ice Data Center
Contact Person: NSIDC User Services

Contact Address:

Address Type: mailing
Address:
  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado
City: Boulder
State or Province: CO
Postal Code: 80309-0449
Country: USA

Contact Voice Telephone: 1 303 492-6199
Contact Facsimile Telephone: 1 303 492-2468
Contact Electronic Mail Address: nsidc@nsidc.org

Resource Description:

NSIDC-0265

Distribution Liability:

NSIDC cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NSIDC makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: Binary

Digital Transfer Option:

Online Option:

Computer Contact Information:

Network Address:

Network Resource Name: Click here.

Fees: None

Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: GIF

Digital Transfer Option:

Online Option:

Computer Contact Information:

Network Address:

Network Resource Name: Click here.

Fees: None

Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: ASCII Text (.txt)

Digital Transfer Option:

Online Option:

Computer Contact Information:

Network Address:

Network Resource Name: Click here.

Fees: None

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Metadata Reference Information:

Metadata Date:

20130624

Metadata Review Date:

20130624

Metadata Contact:

Contact Information:

Contact Person Primary:

Contact Person: NSIDC User Services
Contact Organization: National Snow and Ice Data Center

Contact Address:

Address Type: mailing
Address:
  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado
City: Boulder
State or Province: CO
Postal Code: 80309-0449
Country: USA

Contact Voice Telephone: 1 303 492-6199
Contact Facsimile Telephone: 1 303 492-2468
Contact Electronic Mail Address: nsidc@nsidc.org

Metadata Standard Name:

FGDC Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata

Metadata Standard Version:

FGDC-STD-012-2002

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Metadata Views

FGDC Text-Only

Federal Geographic Data Committee (FGDC) in plain text

FGDC XML

Federal Geographic Data Committee (FGDC) in Extensible Markup Language (XML)

DIF HTML

NASA Global Change Master Directory (GCMD) Directory Interchange Format (DIF)

ISO HTML

International Organization for Standardization (ISO) 19115:2003 Geographic Information Metadata