This work uses satellite data to detect palaeofluvial traces in arid and semiarid areas. The studies cover three places with archaeological evidences useful to date the palaeoenvironmental changes. In Wadi Tanezzuft (Libya) the absence of vegetation allows using satellite imagery to detect geological features. The band ratios on multispectral data (Landsat, ASTER) put in evidence the presence of fine sediment in palaeolakes and alluvium, iron-oxides in palaeodunes and desert varnish on palaeosurfaces. The single palaeofluvial bars can be seen in high resolution imagery (SPOT, PRISM, Ikonos) while the gravel belt representing the palaeoriver’s bed is better visible in L-band radar data (PALSAR). The digital elevation model (SRTM DEM) is used to delimitate the hydrological basin and identify the structural depression. In the area of Tell Beydar (Syria), the DEM is useful to detect tells (artificial mounds with archaeological significance) end extract hydrographical network. A method to clean the vertical errors in the DEM is proposed and the comparison with fluvial traces recognized on satellite imagery (SPOT and DOI) allows seeing the improvements brought by the cleaning procedure. On the Murghab fluvial fan (Turkmenistan), the DEM shows the relief of many palaeofluvial ridges associated with archaeological site and it allow studying the features in the mountain basin; curvature and slope parameters identify badlands forms developed on friable terrains.
Il Remote-Sensing per lo Studio Geomorfologico e Geoarcheologico di Zone Aride / A. Perego ; Mauro Cremaschi, Andrea Tintori. DIPARTIMENTO DI SCIENZE DELLA TERRA, 2009 Jan. 20. ciclo, Anno Accademico 2006/2007.
Il Remote-Sensing per lo Studio Geomorfologico e Geoarcheologico di Zone Aride
A. Perego
2009
Abstract
This work uses satellite data to detect palaeofluvial traces in arid and semiarid areas. The studies cover three places with archaeological evidences useful to date the palaeoenvironmental changes. In Wadi Tanezzuft (Libya) the absence of vegetation allows using satellite imagery to detect geological features. The band ratios on multispectral data (Landsat, ASTER) put in evidence the presence of fine sediment in palaeolakes and alluvium, iron-oxides in palaeodunes and desert varnish on palaeosurfaces. The single palaeofluvial bars can be seen in high resolution imagery (SPOT, PRISM, Ikonos) while the gravel belt representing the palaeoriver’s bed is better visible in L-band radar data (PALSAR). The digital elevation model (SRTM DEM) is used to delimitate the hydrological basin and identify the structural depression. In the area of Tell Beydar (Syria), the DEM is useful to detect tells (artificial mounds with archaeological significance) end extract hydrographical network. A method to clean the vertical errors in the DEM is proposed and the comparison with fluvial traces recognized on satellite imagery (SPOT and DOI) allows seeing the improvements brought by the cleaning procedure. On the Murghab fluvial fan (Turkmenistan), the DEM shows the relief of many palaeofluvial ridges associated with archaeological site and it allow studying the features in the mountain basin; curvature and slope parameters identify badlands forms developed on friable terrains.Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.