precise geoid determination on islands suffers from the lack of accurate gravity data on the open seas. nowadays, sub-microgal accuracy for the land gravity observations is obtainable. but the sea gravity data which are collected via shipborne techniques, due to the measuring environment at sea area, are usually highly noisy and are contaminated with various systematic errors. on the other hand...

The special issue (SI) “Radar Systems for the Societal Challenges” is an updated survey of recent advances in radar systems, encompassing several application fields and related to the impact on society. In fact, radar technology is now pervasive in society and is crucial for tackling social and economic issues for the wellbeing of the population. In fact, in addition to the classical applicatio...

We have derived digital elevation models (DEMs) over the western part of the Devon Ice Cap in Nunavut, Canada, using “swath processing” of interferometric data collected by Cryosat between February 2011 and January 2012. With the standard ESA (European Space Agency) SARIn (synthetic aperture radar interferometry) level 2 (L2) data product, the interferometric mode is used to map the cross-track...

Wetlands are considered a challenging environment for mapping approaches based on Synthetic Aperture Radar (SAR) data due to their often complex internal structures and the diverse backscattering mechanisms caused by vegetation, soil moisture and flood dynamics contributing to the resulting imagery. In this study, a time series of >100 SAR images acquired by ENVISAT during a time period of ca. ...

Abstract For nearly 30 years, space-based radar altimetry has been routinely measuring changes in sea level at global and regional scales. But this technique designed for the open ocean does not provide reliable data within 20 km to coast, mostly due land contamination echo vicinity of coast. This problem can now be overcome through dedicated reprocessing, allowing retrieval valid 0-20 band fro...

Satellite radar altimeter plays an important role in ocean remote sensing. In China an altimeter will be embarked on the forthcoming HY-2 satellite, which can bring significant benefits to international altimetry society. Modern altimeters adopt I/Q demodulators to detector sea echoes, so the imbalances between the in-phase (I) and quadrature (Q) channels introduce errors on altimeter parameter...