The purpose of this study is to develop and evaluate techniques that improve the
spatial resolution of the channels already selected in the preliminary studies for
Geostationary Observatory for Microwave Atmospheric Soundings (GOMAS).
Reference high resolution multifrequency brightness temperatures scenarios have
been derived by applying radiative transfer calculation to the spatially and
microphysically detailed output of meteorological events simulated by the University
of Wisconsin - Non-hydrostatic Model System (UW-NMS). Three approaches, Wiener
filter, Super-Resolution and Image Fusion have been applied to some representative
GOMAS frequency channels to enhance the resolution of antenna temperatures. The
Wiener filter improved resolution of the largely oversampled images by a factor 1.5-
2.0 without introducing any penalty in the radiometric accuracy. Super-resolution,
suitable for not largely oversampled images, improved resolution by a factor ~1.5 but
introducing an increased radiometric noise by a factor 1.4-2.5. The image fusion
allows finally to further increase the spatial frequency of the images obtained by the
Wiener filter increasing the total resolution up to a factor 5.0 with an increased
radiometric noise closely linked to the radiometric frequency and to the examined
case study.
| Identifer | oai:union.ndltd.org:unibo.it/oai:amsdottorato.cib.unibo.it:862 |
| Date | 30 June 2008 |
| Creators | Di Paola, Francesco <1973> |
| Contributors | Dietrich, Stefano |
| Publisher | Alma Mater Studiorum - Università di Bologna |
| Source Sets | Università di Bologna |
| Language | Italian |
| Detected Language | English |
| Type | Doctoral Thesis, PeerReviewed |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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