نتایج جستجو برای: ماهواره envisat
تعداد نتایج: 6744 فیلتر نتایج به سال:
Validation of ENVISAT/SCIAMACHY columnar CO by FTIR profile retrievals at the Ground-Truthing Station Zugspitze R. Sussmann and M. Buchwitz IMK-IFU, Forschungszentrum Karlsruhe, Garmisch-Partenkirchen, Germany Institute of Environmental Physics (iup), University of Bremen FB1, Bremen, Germany Received: 13 July 2004 – Accepted: 13 January 2005 – Published: 3 February 2005 Correspondence to: R. S...
Validation of ENVISAT/SCIAMACHY columnar methane by solar FTIR spectrometry at the Ground-Truthing Station Zugspitze R. Sussmann, W. Stremme, M. Buchwitz, and R. de Beek IMK-IFU, Forschungszentrum Karlsruhe, Garmisch-Partenkirchen, Germany Institute of Environmental Physics (iup), University of Bremen FB1, Bremen, Germany Received: 27 January 2005 – Accepted: 23 March 2005 – Published: 13 April...
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...
تکنیک تداخل¬سنجی راداری با استفاده از اطلاعات فاز موجود در تصاویر راداری قادر به اندازه گیری تغییر شکل زمین با دقت قابل ملاحظه می باشد. مهم¬ترین عاملی که دقت نتایج این تکنیک را تحت تاثیر قرار می¬دهد، عبور سیگنال راداری از لایه¬های مختلف جو می¬باشد. از بین لایه های مختلف، لایه تروپوسفر بیشترین اثر را بر روی فاز تصاویر راداری می¬گذارد. در نتیجه در صورت تصحیح دقیق اثرات این لایه از روی فاز سیگنال ...
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. ...
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