Home » Satellite Instruments » Geoscience Laser Altimeter System (GLAS)
Geoscience Laser Altimeter System (GLAS)
STATUS
Sailboat Mode
AVAILABILITY
Public
REQUEST PROCEDURE
All data products are available from the National Snow and Ice Data Center (nsidc.org)
Satellite Instruments
The Ice Cloud and land Elevation Satellite has only one instrument - the Geoscience Laser Altimeter System (GLAS). GLAS measures surface elevation using 1064nm spots of ~65m diameter every ~170m along the nadir profile. The laser is doubled to 532nm for cloud and aerosol measurements.
CONTACT
David Korn
NSIDC User Services
449 UCB Boulder CO 80309
303-492-6199
nsidc@nsidc.org
http://nsidc.org/
SPECIFICATIONS
Measurment TypeVisible/IR-LIDAR
Platform TypeICESat
OrbitOther (provide altitude, inclination, cycle)
Spectral Coverage
Active/PassiveActive
Scan PatternNadir
Variables
Altitude600
Inclination94
Repeat Time91 day
Wavelength532 to 1064nm
Number of Bands2 - 532nm and 1064nm
Start DateFeb 2003
Temporal Coverage1064 nm wavelength used for surface altimetry; 512 nm wavelength used for atmosphere
Swath WidthNot a swath inst.
Resolution 1Along-track, direction of motion- 70m
REFERENCES
http://icesat.gsfc.nasa.gov
REMARKS
As of October 11, 2009, Laser 2 of the Geoscience Laser Altimeter System (GLAS) onboard the ICESat satellite stopped emitting light pulses. Since this time, no new science data have been returned from the GLAS instrument. Currently, a GLAS Anomaly Review Board has reviewed and assessed the situation and a series of attempts to restart Laser 2 has been initiated, to be followed by attempts on the other two lasers which stopped working earlier in the mission. Please stay tuned for future ICESat Mission Updates.
UPDATED ON
13 Nov 2009 12:49