Polar Ice Altimetry
Polar Ice Altimetry
5 Km Antarctica and Greenland DEMs from Geosat and ERS-1
The Cryosphere Science Research of the
Earch Sciences Division at
NASA/
GSFC, under the direction of Dr. H. Jay Zwally, with contractor support from
SGT, Inc. and
SSAI, Inc., has processed satellite radar and aircraft laser altimetry over the continental ice sheets and surrounding sea ice to calculate surface elevations.
04/08/2012 -- ENVISAT mission ended on April 8,2012
04/08/2010 -- Cryosat-2 was launched successfully.
08/31/2000 -- IMPORTANT information for users
of ERS-1 and ERS-2 altimetry data regarding:
- The USO and SPTR corrections:
There are two corrections to the ERS-1 and ERS-2 ranges that were applied
to the online Greenland and Antarctica data. The first of these is a
correction for a drift in the Ultra-Stable Oscillator(USO). The second is
the Scanning Point Target Response(SPTR) correction. The characterization
of these two corrections can be found on the ESA Earth Observation web site.
- A 40.9 cm bias that exists bewteen the ERS-1 and ERS-2 altimeter ranges.
This correction has also been applied to the ERS Greenland and Antarctica data.