A wavelet based methodology has been developed to retrieve the wind field over the sea surface from SAR images without any a-priori information of the wind direction. The method relies on the ability of the twodimensional continuous wavelet technique to detect the spatial structure of the Marine Atmospheric Boundary Layer (MABL). The analysis of the geometric and radiometric characteristics of ...

The availability of reliable land surface information is crucial for a wide range of applications such as environmental monitoring including essential climate change variables, or agroeconomical aspects for a sustainable land management. Compared to optical remote sensing data, radar sensors can provide datasets with regular coverage of a specific area without suffering from missing images beca...

In this paper, a technique that is able to retrieve soil moisture maps in areas at risk of flood from ENVISAT/ASAR images, based on a Neural Network approach, was tested. Some experimental trials were carried out in 2003 and 2004 in the agricultural area of the Scrivia watershed in northern Italy, simultaneously to the ASAR passes. This area is susceptible to flooding and has a dense hydrometri...

Spectra derived from ENVISAT Advanced Synthetic Aperture Radar (ASAR) and QuikSCAT near-surface ocean winds are investigated over the North Sea. The two sensors offer a wide range of spatial resolutions, from 600 m to 25 km, with different spatial coverage over the area of interest. This provides a unique opportunity to study the impact of the spatial resolution on the spectral properties of th...

Poyang Lake is the largest freshwater lake in China with an area of about 3,000 km2. Its wetland ecosystem has a significant impact on China’ s environment change. Traditional way to monitor biomass change on this area is to use linear or nonlinear model from TM/ETM data. In this paper we discuss the neural network algorithms(NNA) to retrieve wetland biomass from multipolarization(HH and VV) ba...

The objective of this study is to present a new application of optical and radar remote sensing with high spatial ( 10 m) and temporal (a few days) resolutions for the detection of tillage and irrigation operations. The analysis was performed for irrigated wheat crops in the semi-arid Tensift/Marrakech plain (Central Morocco) using three FORMOSAT-2 images and two ASAR images acquired within one...

Air-sea exchange of CO2 is parameterized along the cruise track of Galathea 3 – a worldwide research expedition. A key parameter is the gas transfer velocity, which varies with wind speed. Wind speeds are measured continuously on board the research vessel. For selected areas, winds are also retrieved from Envisat ASAR images, as the ASAR senses small-scale waves at the sea surface generated by ...

This study uses the spaceborne radar interferometry technique to monitor ground subsidence and far-field displacement due to underground longwall mining in the Southern Coalfields of New South Wales, Australia. The radar images acquired by the European ENVISAT/ASAR and the Japanese ALOS/PALSAR sensors were used to compute the terrain deformation. ASAR and PALSAR sensors use microwave signals in...

As part of a Tanzanian-Norwegian cooperation project on Monitoring Reporting and Verification (MRV) for REDD+, 2007-2011 Cand L-band synthetic aperture radar (SAR) backscatter data from Envisat ASAR and ALOS Palsar, respectively, have been processed, analysed and used for forest and forest change mapping over a study side in Liwale District in Lindi Region, Tanzania. Land cover observations fro...