This paper assesses the synergy of RADARSAT and ENVISAT data for rice monitoring. Crop growth profile derived from the analysis of temporal backscatter of RADARSAT SCNB (July-August) and ENVISAT of IS4 and IS5 (September-November) enables to classify early, normal and late sown crop with 10-12 dB difference throughout the growth cycle. An inversion algorithm relating backscatter and plant heigh...

On the base of the Integrated Agricultural Administration and Controlling System (InVeKos) the Federal State of Thuringia (Germany) has a strong interest in actual, area covering land use types and borders. Until now the inventory is based on optical orthophotos. Goal of this study is to analyze, whether these orthophotos might be replaced by spaceborne remote sensing data, especially by multit...

Bistatic radar is an active microwave sensor operating with separated transmitting and receiving antennae. This paper deals with a spaceborne mission of a bistatic synthetic aperture radar based on a small satellite flying in formation with ENVISAT along parallel orbits, and equipped with a receiving only microwave system, which catches the ASAR echoes. The proposed system does not require any ...

Following the commissioning phase of the Advanced Synthetic Aperture Radar (ASAR) instrument on-board EnviSat decision was taken to re-deploy three of the existing four ASAR Transponders, specially procured for this instrument, from locations within The Netherlands to sites all over the world. The Re-Deployment of the ASAR Transponders describes a major activity in order to maintain the high le...

An algorithm for the retrieval of surface wind speed from Ku-band altimeter backscatter coefficient is proposed. The algorithm was derived using two-month worth of ENVISAT altimeter backscatter data collocated with ECMWF model and buoy wind speeds. The algorithm was extensively verified for ENVISAT, ERS2 and Jason-1 altimeters. The algorithm performance is better than the “modified Chelton-Went...

As part of the Danish contribution to MarCoast – the element of GMES (Global Monitoring for Environment and Security) Service Element Project that addresses the marine environment in Europe – DHI & GRAS have developed and are operating an operational forecast system based on numerical modelling. The models are capable of predicting a range of hydrodynamic, biological and wave phenomena up to 5 ...

This paper reports the progress of the Envisat CAL/VAL Project No 1078. Subsidence in an underground coal mining region southwest of Sydney, Australia, has been monitored using ERS and JERS-1. Seven Envisat images have been acquired in various imaging modes from both ascending and descending passes over the same mining region. More Envisat images have been scheduled and will be acquired in the ...

Interferometric data processing requires careful calibration and validation of the complex input products. Interferometric calibration comprises geometric and phase accuracy aspects. With respect to geometry, orbit and timing parameter have to be calibrated in order to allow accurate geo-coding and optimal processing of the interferometric products. Phase accuracy of the input complex products ...

This study presents a new method to analyse some parameters of snow in alpine region: density, wetness. Here are developed the methodology and first results obtained from a set of ASAR-ENVISAT images registered during 2004 spring period over an experimental river basin located in the French Alps (N 45° 05’/ E 6° 10’). For ENVISAT/ASAR data, a topographic processing is done using a Digital Eleva...

Nowadays, spaceborne Synthetic Aperture Radar (SAR) has become a powerful tool for providing significant wave height. Traditionally, validation of SAR derived ocean wave height has been carried out against buoy measurements or model outputs, which only yield a inter-comparison, but not an ‘absolute’ validation. In this study, the triple collocation error model has been introduced in the validat...