Metodologia per la caratterizzazione spettrale delle superfici saline e delle aree interessate da aspersioni sabbiose tramite proximal sensing e remote sensing in Tunisia
AFRASINEI, GABRIELA MIHAELA;MELIS, MARIA TERESA;FRAU, FRANCO;DEMURTAS, VALENTINO;BUTTAU, CRISTINA;ARRAS, CLAUDIO;GHIGLIERI, GIORGIO
2015-01-01
Abstract
This paper presents the preliminary results of a research carried out in the Medenine area, Southern Tunisia, aimed at the spectral characterization of salt-affected and sand encroachment areas, as restrictive factors for agro-pastoral activities. Spectral data was acquired in situ using a handheld spectroradiometer and samples were taken for X-ray diffractometric analysis. The sampling sites were chosen on the basis of a morphological analysis, ancillary data and a land cover/land use map specifically generated for this study employing Landsat 8 imagery. The study area (400 000 hectares) has been validated with 400 ground truth points. The spectral campaign has enabled the acquisition of spectral reflectance measurements of 34 points, of which 14 points for saline surfaces (9 samples); 10 points for sand encroachment areas (10 samples); 3 points for typical vegetation (halophyte and psammophyte) and 7 points for mixed surfaces. The acquired spectral signatures were processed to be integrated into the web platform SPECCHIO for comparison with measurements acquired in similar environments. Diffractometric analyses were completed for the saline samples and allowed the identification of the main mineralogical components. This study proposes a methodology based on the integrated spectral data acquired through proximal and remote sensing aimed at monitoring of land degradation phenomena. The study is part of the WADIS-MAR, a demonstration project funded by the European Commission through the Sustainable Water Integrated Management (SWIM) Programme (http://www.wadismar.eu).File | Dimensione | Formato | |
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