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| Boisot, Olivier; Nouguier, Frederic; Chapron, Bertrand; Guerin, Charles-antoine. |
| We introduce a practical and accurate model, referred to as "GO4," to describe near-nadir microwave scattering from the sea surface, and at the same time, we address the issue of the filtered mean square slope (mss) conventionally used in the geometrical optics model. GO4 is a simple correction of this last model, taking into account the diffraction correction induced by the rough surface through what we call an effective mean square curvature (msc). We evaluate the effective msc as a function of the surface wavenumber spectrum and the radar frequency and show that GO4 reaches the same accuracy as the physical optics model in a wide range of incidence and frequency bands with the sole knowledge of the mss and msc parameters. The key point is that the mss... |
| Tipo: Text |
Palavras-chave: Curvature; Geometrical optics; Near-nadir; Ocean radar sensing; Slope. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00277/38789/37537.pdf |
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| Souza,Zigomar M. de; Cerri,Domingos G. P.; Magalhães,Paulo S. G.; Siqueira,Diego S.. |
| Soils submitted to the same management system in places with little variation of landscape, manifest differentiated spatial variability of their attributes and crop yield. The aim of this work was to investigate the correlation between spatial variability of the soil attributes and sugarcane yield as a result of soil topography. To achieve this objective, a test area of 42 ha located at the São João Sugar Mill, in Araras, in the State of São Paulo, Brazil, was selected. Sugarcane yield was measured with a yield monitor fitted in a sugarcane harvester and GPS signal. A total of 170 soil samples were taken at regular 50 m grid, at a depth of 0 - 0.2 m. The area under study was divided into two sites based on topography. The following soil attributes were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum sp; Geostatistics; Semivariogram; Curvature; Precision agriculture. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010001200001 |
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