Sentences with phrase «radar altimetry»
Radar altimetry is a technology used to measure the height or distance between an aircraft or satellite and the Earth's surface. It does this by sending out radar signals towards the ground and then measuring the time it takes for the signals to bounce back. This information helps in the understanding of navigation, mapping, and monitoring of oceans and land surfaces by providing accurate altitude measurements. Full definition
We all must remember the lesson from radar altimetry studies such as Wingham et al. 2006.
rabett.blogspot.ru
To get the biggest picture now available, Paolo and his colleagues stitched together satellite radar altimetry data from three consecutive and overlapping missions: the European Space Agency's (ESA's) ERS - 1 and ERS - 2 (which flew from 1991 to 2000 and 1995 to 2011, respectively), and ESA's ENVISAT mission, which collected data from 2002 to 2012.
These missions - satellite radar altimetry projects overseen by the European Space Agency (ESA)- lasted from 1994 to 2012, providing the researchers plenty of data that could even be overlapped and compared to ensure an accurate assessment of ice shelf thickness for more than a decade.
Indeed, satellite gravity data and radar altimetry reveal that the Totten Glacier of East Antarctica, which fronts a large ice mass grounded below sea level, is now losing mass [90].
Recently an improved radar altimetry study confirms and extends earlier measurements (Flament and Rémy 2012).
Satellite radar altimetry mapping and change detection, developed in the early to mid-1990s allowed the research community to finally extract reliable quantitative information regarding the overall growth or reduction of the volume of the ice sheets.
ERS radar altimetry data are copyright to ESA 1994 and 1995.
Comment on «On the joint distribution of surface elevations and slopes for a nonlinear random sea, with an application for radar altimetry» by M.A. Srokosz, J. Geophys.
To really understand what's going on with the ice shelves and ice sheets, he says, scientists will need not only radar altimetry data but also continuous measurements of ocean properties near and under the ice shelves, and better bathymetry maps, such as Siegert's team produced.
They used recently - available stereo radar elevation data (from Dr. R. Herrick, University of Alaska) rather than using the lower resolution radar altimetry.
The rates and geographic extent of ice loss are «very surprising,» says radar altimetry expert Curt Davis of the University of Missouri, Kansas City.
Dynamic thinning of Antarctic glaciers from along - track repeat radar altimetry.
Laser altimetry from ICESat has now supplemented radar altimetry measurements for more detailed volumetric - based studies.
Over the ocean this includes: sea surface slope and surface current, significant wave height, wind speed and sea level from radar altimetry at about 10 km resolution: sea surface temperature under cloud free conditions from the infrared radiometer at about 300 m resolution; chlorophyll a and phytoplankton from the imaging spectrometer under cloud free conditions at about 300 m resolution.
Indeed, satellite gravity data and radar altimetry reveal that the Totten Glacier of East Antarctica, which fronts a large ice mass grounded below sea level, is now losing mass [90].
Satellite radar altimetry, in which timing of a radar or laser beam return back to a satellite is used as a measure of surface elevation, enabled researchers to assess ice mass by examining elevation change over time.
The full - mission reprocessing of the ESA ERS Radar Altimetry (RA) Level 2 data has been completed and the new data set is now available online to the ESA Earth Observation user community.
Over the sea ice field the observations include: sea ice freeboard height and hence sea ice thickness from radar altimetry; sea ice surface temperature and sea ice drift from respectively infrared radiometer and imaging spectrometer under cloud free conditions.
For the last phase, from 2003 to 2010, the researchers relied on laser altimetry and radar altimetry to estimate the ice elevation and map the receding ice sheet.
Stenoien, Mark D. and Charles R. Bentley, Pine Island Glacier, Antarctica: a study of the catchment using interferometric Synthetic Aperture Radar measurements and radar altimetry, J. Geophys.