This paper reports on the development of Neural Networks algorithms for tropospheric ozone retrieval from ESA-Envisat SCIAMACHY measurements. We present and discuss some retrieval experiments from UV/VIS simulated data, based upon a combined sensitivity analysis performed with the aid of the UVSPEC radiative transfer model and a neural Extended Pruning procedure. In particular, the role of UV a...

In this study, the capability of the phase difference standard deviation value (σφc) to distinguish among different dark features over marine polarimetric SAR images is investigated. The σφc, evaluated between the co-polarized terms of the scattering matrix, needs only HH and VV data and can be applied also on dualpolarized SAR sensors such as the ASAR operated on board of the ENVISAT satellite...

The MERIS and AATSR instruments onboard ENVISAT provide similar resolution and swath but complementary information, encompassing different spectral domains and viewing geometries. We present research on synergistic use of MERIS and AATSR imagery, with objectives (i) to define and evaluate algorithms for improved cloud screening, global aerosol retrieval and land atmospheric correction, (ii) to ...

An optimal estimation retrieval approach has been applied to derive CFC-11 vertical profiles from Envisat MIPAS measurements. Rapid forward modeling during the retrieval process is based on well-tested approximative methods for the evaluation of the radiative transfer equation. We give a short description of the retrieval system, show an error analysis and discuss the global distribution of CFC...

The paper deals with the possibility of getting interferograms and/or super resolution images by combining ERS and ENVISAT acquisition despite of their different central frequencies. It is shown that the frequency shift can be compensated – for a limited range of slopes – by exploiting large baselines (2.5 km). Interferograms with elevation of ambiguity smaller than 5 meters and coherence great...

This research used both ERS and JERS-1 images to investigate the feasibility of differential radar interferometry (DInSAR) for mine subsidence monitoring in the state of New South Wales, Australia. DInSAR results are analysed and validated with the aid of Geographic Information System (GIS) tools. The drawbacks of using interferometric measurements for mine subsidence monitoring are discussed. ...

Satellites observing and measuring the Earth’s surface with electromagnetic waves are subject to atmospheric path delays. These atmospheric effects on radar signal propagation modify the signal velocity and direction and can be considered by simple modeling. In order to increase the geolocation accuracy of spaceborne SAR applications we developed a software tool that accounts for atmospheric pa...

In this paper the Finnish ENVISAT CAL/VALproject as well as some results obtained in the project will be presented. The project has three major objectives. One objective is to implement an operational data processing chain, the other is to analyze the effect of different ice properties on the SAR signature and its statistics mainly through empirical backscatter studies, and the third is to deve...

Satellite sensors of low, high or moderate spatial resolution have started to be used in the last decade to assess and map atmospheric pollution over and around cities. This paper presents preliminary results of the ESA “AO1495” project aiming at the acquisition and examination of Envisat MERIS data for monitoring air pollution (in terms of aerosol optical thickness) in the lower troposphere of...

Ozone profiles retrieved from limb scattering measurements of the SCIAMACHY instrument based on the satellite ENVISAT are compared to ground-based low altitude resolution remote sensors. All profiles are retrieved using optimal estimation. Following the work of Rodgers and Connor (2003) the retrievals of the ground-based instruments are simulated using the SCIAMACHY retrieval. The SCIAMACHY res...