GLAS/ICESat L2 Antarctic and Greenland Ice Sheet Altimetry Data (HDF5)

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Entry ID

GLAH12

Summary

GLAH06 is used in conjunction with GLAH05 to create the Level-2 altimetry products. Level-2 altimetry data provide surface elevations for ice sheets (GLAH12), sea ice (GLAH13), land (GLAH14), and oceans (GLAH15). Data also include the laser footprint geolocation and reflectance, as well as geodetic, instrument, and atmospheric corrections for range measurements. The Level-2 elevation products, are regional products archived at 14 orbits per granule, starting and stopping at the same demarcation (± 50° latitude) as GLAH05 and GLAH06. Each regional product is processed with algorithms specific to that surface type. Surface type masks define which data are written to each of the products. If any data within a given record fall within a specific mask, the entire record is written to the product. Masks can overlap: for example, non-land data in the sea ice region may be written to the sea ice and ocean products. This means that an algorithm may write the same data to more than one Level-2 product. In this case, different algorithms calculate the elevations in their respective products. The surface type masks are versioned and archived at NSIDC, so users can tell which data to expect in each product. Each data granule has an associated browse product.

Geographic Coverage

 

Spatial Coordinates:
N: 86°     S: -86°     E: 180°     W: -180°    

Data Set Citation

Dataset Creator: Zwally, H., R. Schutz, D. Hancock, and J. Dimarzio.
Dataset Title: GLAS/ICESat L2 Antarctic and Greenland Ice Sheet Altimetry Data (HDF5)
Dataset Release Date: 2014-10-17
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data Center
Version: 34
Online Resource: http://nsidc.org/data/glah12.html
Dataset DOI: http://dx.doi.org/10.5067/ICESAT/GLAS/DATA209

Temporal Coverage

Start Date: 2003-02-20
Stop Date: 2009-10-11

Data Resolution

Latitude Resolution: 60 m
Longitude Resolution: 60 m

Location Keywords

  • GEOGRAPHIC REGION GLOBAL

Science Keywords

  • Cryosphere Glaciers/Ice Sheets Glacier Elevation/Ice Sheet Elevation Laser Reflectance
  • Cryosphere Glaciers/Ice Sheets Glacier Topography/Ice Sheet Topography
  • Cryosphere Glaciers/Ice Sheets Ice Sheets
  • Cryosphere Sea Ice Reflectance Laser Reflectance
  • Oceans Sea Ice Reflectance
  • Terrestrial Hydrosphere Glaciers/Ice Sheets Glacier Elevation/Ice Sheet Elevation
  • Terrestrial Hydrosphere Glaciers/Ice Sheets Glacier Topography/Ice Sheet Topography
  • Terrestrial Hydrosphere Glaciers/Ice Sheets Ice Sheets

Ancillary Keywords

  • Atmospheric Delay Correction
  • DAAC
  • Dem
  • EOSDIS
  • GLA12
  • GLAS
  • Ice Roughness
  • ICESat
  • Ice Sheet Elevation
  • ISIPS
  • Laser Footprint
  • Laser Pulse
  • NASA
  • Noise Level
  • NSIDC
  • Off-nadir Pointing Direction
  • Peak Amplitude
  • Range
  • Received Energy
  • Received Pulse Gain
  • Signal Saturation
  • Solar Incidence Angle
  • Transmitted Energy
  • Transmitted Gain
  • Waveform
  • Waveform Kurtosis
  • Waveform Peak
  • Waveform Skewness

ISO Topic Category (View Definitions)

  • Elevation

Platform

  • ICESAT Ice, Cloud and Land Elevation Satellite

Instrument

  • GLAS Geoscience Laser Altimeter System

Project

  • ICESAT Ice, Cloud and Land Elevation Satellite

Quality

Each data granule has associated browse products that users can quickly view to determine the general quality of the data in the granule. Altimeter Frame Quality Flag is included in file level global attributes and includes a corrections flag. Indicates if all data in frame are good with appropriate corrections applied; or if some of data are not corrected or have measurement problems.

Data Set Progress

complete

Originating Center

NASA/GSFC/EOS/EO

Data Center

NASA DAAC at the National Snow and Ice Data Center
Data Center URL: http://nsidc.org/daac/index.html

Data Center Personnel

Name: NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Email: nsidc@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

Data Center Personnel

Name: NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Email: nsidc@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: 44 MB
Distribution Format: HDF

Personnel

NSIDC User Services
Role: TECHNICAL CONTACT
Phone: 1 303 492-6199 x
Fax: 1 303 492-2468 x
Email: nsidc@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

David Hancock
Role: INVESTIGATOR
Email: David.W.Hancock@nasa.gov
Contact Address:

  • NASA Goddard Space Flight Center
  • ISIPS Manager
  • NASA Goddard Space Flight Center
  • Wallops Flight Facility
  • Wallops Island, VA
  • USA

H. Jay Zwally
Role: INVESTIGATOR
Phone: 1 301 614-5643
Fax: 1 301 614-5644
Email: Jay.Zwally@nasa.gov
Contact Address:

  • NASA/Goddard Space Flight Center
  • Laboratory for Hydrospheric Processes
  • Laboratory for Hydrospheric Processes
  • NASA/Goddard Space Flight Center
  • Code 971

City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

H. Jay Zwally
Role: INVESTIGATOR
Phone: 1 301 614-5643
Fax: 1 301 614-5644
Email: Jay.Zwally@nasa.gov
Contact Address:

  • NASA/Goddard Space Flight Center
  • Laboratory for Hydrospheric Processes
  • Laboratory for Hydrospheric Processes
  • NASA/Goddard Space Flight Center
  • Code 971

City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

Robert Schutz
Role: INVESTIGATOR
Contact Address:

  • University of Texas at Austin
  • Center for Space Research
  • GLAS Science Team Lead
  • University of Texas at Austin
  • Center for Space Research

City: Austin
Province or State: TX
Postal Code: 78712-1085
Country: USA

John Dimarzio
Role: INVESTIGATOR
Phone: 1 301 614-5893
Email: john.dimarzio@gsfc.nasa.gov
Contact Address:

  • NASA/Goddard Space Flight Center
  • SGT, Inc.
  • SGT, Inc.
  • NASA/Goddard Space Flight Center
  • Cryospheric Sciences Branch Code 614.1

City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

Related URL

VIEW PROJECT HOME PAGE
ICESat/GLAS web site at NASA Goddard Space Flight Center

VIEW PROJECT HOME PAGE
ICESat/GLAS web site at NASA Wallops Flight Facility

VIEW PROJECT HOME PAGE
ICESat/GLAS web site at University of Texas

VIEW RELATED INFORMATION
ICESat/GLAS Data at NSIDC

VIEW RELATED INFORMATION
Polar Ice Sheet DEMs and Elevation Data

Reference

Bae, S. and B.E. Schutz. 2002. Precision attitude determination (PAD). GLAS algorithm theoretical basis document. Version 2.2. Austin, TX: Center for Space Research, University of Texas at Austin.

Brenner, A.C., C.R. Bentley, B.M. Csatho, D.J. Harding, M.A. Hofton, J. Minster, L. Roberts, J.L. Saba, R. Schutz, R.H. Thomas, D. Yi, and H.J. Zwally. 2000. Derivation of range and range distributions from laser pulse waveform analysis for surface elevations, roughness, slope, and vegetation heights. Algorithm theoretical basis document. Version 3.0. Greenbelt, MD: Goddard Space Flight Center.

Center for Space Research. 'ICESat/GLAS.' January 2002. http://www.csr.utexas.edu/glas/.

Davis C.H. and H.J. Zwally. 1993. Geographic and seasonal variations in the surface properties of the ice sheets by satellite radar altimetry. Journal of Glaciology 39:687-697.

Earth Science Data and Information System (ESDIS). 1996. EOS Ground System (EGS) Systems and Operations Concept. Greenbelt, MD: Goddard Space Flight Center.

Farrell, W.E. 1972. Deformation of the Earth by surface loads. Review of Geophysics and Space Physics 10: 761-797.

GLAS Science Team. 2000. Mission Operations Requirement Document (MORD) for the Ice, Cloud and Land Elevation Satellite (ICESat) Mission. Greenbelt, MD: Goddard Space Flight Center.

GLAS Science Team. 1997. GLAS Science Requirements. Version 2.01. Greenbelt, MD: Goddard Space Flight Center.

Heroux, D. 2000. Progress report on GLAS interface effort with ECS NOSE. Rev. 29 December 2000. Landover, MD: Emergent-IT/Raytheon.

Herring, T.A. and K. Quinn. 1999. Atmospheric delay correction to GLAS laser altimeter ranges. GLAS algorithm theoretical basis document. Version 1.0. Lanham, MD: Science Systems and Applications, Inc.

Jester, P., and D. Hancock. 2002. The Algorithm Theoretical Basis Document for Level 1A Processing, Version 1.2. Wallops Island, VA: Raytheon ITSS.

Jester, P., and J. Lee. 2002. GLAS standard data products specification - level 1. Version 6.0. Wallops Island, VA: Raytheon ITSS.

Lee, J. 2002. GSAS user's guide: Version 4.0. Wallops Island, VA: Raytheon ITSS.

McGarry, J.F., J. Abshire, X. Sun, J. Saba, A. Brenner, and D. Yi. 2002. GLAS flight science data selection algorithms for the altimeter (1064 nm), Version 4.15. Unpublished report.

Rim, H., and B. Schutz. 2002. Precision orbit determination. GLAS algorithm theoretical basis document. Version 2.2. Austin, TX: Center for Space Research, University of Texas at Austin.

Schutz, B. 2000. GLAS altimeter post-launch calibration/validation plan. Version 0.99. Austin, TX: Center for Space Research, University of Texas at Austin.

Schutz, B. 2002. Laser footprint location (geolocation) and surface profiles. GLAS algorithm theoretical basis document. Version 3.0. Austin, TX: Center for Space Research, University of Texas at Austin.

Wahr, J., D. Wingham, and C. Bentley. 2000. A method of combining ICESat and GRACE satellite data to constrain Antarctic mass balance. Journal of Geophysical Research 105(B7):16,279-16,294.

Yi, D., J. Minster, and C. Bentley. 1999. Ocean tidal loading corrections. GLAS algorithm theoretical basis document. Version 1.0. Greenbelt, MD: Goddard Space Flight Center.

Zwally, H.J., B. Schutz, W. Abdalati, J. Abshire, C. Bentley, A. Brenner, J. Bufton, J. Dezio, D. Hancock, D. Harding, T. Herring, B. Minster, K. Quinn, S. Palm, J. Spinhirne, and R. Thomas. 2002. ICESAT's laser measurements of polar ice, atmosphere, ocean, and land. Journal of Geodynamics 34: 405-445.

Zwally, H.J., B. Schutz, D. Hancock, and A. Brenner. 2000. ICESat/GLAS Standard Data Products in HDF and SCF Formats. Version 1.2. Greenbelt, MD: Goddard Space Flight Center.

Zwally, H.J., R.A. Bindschadler, A.C. Brenner, T.V. Martin, and R.H. Thomas. 1983. Surface elevation contours of Greenland and Antarctic ice sheets. Journal of Geophysical Research 88(C3):1589-1596.

Metadata Name and Version

Metadata Name: CEOS IDN DIF
Metadata Version: 9.7

Creation and Review Dates

DIF Creation Date: 2014-10-17
Last DIF Revision Date: 2014-10-22

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

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