We have conducted airborne measurements over the Greenland ice sheet from the NASA P-3B aircraft using a 150MHz coherent radar depth sounder to obtain extensive ice sheet thickness measurements. Simultaneous measurements of ice sheet elevation were also made using a laser altimeter. In outlet glacier areas along the ice sheet margin, the ice surface is characterized by a very rough, crevassed s...

1589. Lunar and Planetary Institute, Houston. [CD-ROM] Zuber, M. T., D. E. Smith, R. J. Phillips, S. C. Solomon, W. B. Banerdt, G. A. Neumann, and O. Aharonson 1998a. Shape of the northern hemisphere ofET AL. Mars from the Mars Orbiter Laser Altimeter (MOLA). Geophys. Res. Lett.25, 4393–4396. Zuber, M. T., D. E. Smith, S. C. Solomon, J. B. Ashire, R. S. Azfal, O. Aharonson, K. Fishbaugh...

The surface topography of the Greenland and Antarctic ice sheets is the principal ice parameter obtainable from satellite radar altimetry. The improved ability of the GEOSA T altimeter to follow irregular surfaces and its extended operation have greatly increased the available topographic data on ice sheets for the study of ice dynamics and the possible detection of changes in global ice volume.

Here we report timed observations with subnanosecond precision of short laser pulses at a distance of nearly 24 million kilometers between the Mercury Laser Altimeter (MLA) aboard the MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging) spacecraft and the NASA Goddard Geophysical and Astronomical Observatory (GGAO). Forty MLA downlink observations and 90 uplink observations...

Corrections to altimeter-measured sea surface height anomalies (SSHA) have a larger proportional effect for synthetic aperture radar (SAR) altimetry than conventional, pulse-limited because of lower range noise. Here, we quantified the impact current generation altimeter corrections in coastal zone Northwest Atlantic, region with significant dynamic activity. In this study, used level variance ...

Satellite radar altimetry collected during a number of geodetic missions has provided new understanding the topography and tectonics deep oceans. As altimeter performance coverage improves, smaller structures are revealed. Here we investigate contribution six that have been placed into mapping phases for more than one year. Two types evaluations performed. We first compare composite (all altime...