Purpose of the present study is the multitemporal analysis of the past 50 years concerning the Crete Senesi by means of both series of panchromatic and full chromatic multi-temporal aerial photos, and recent high resolution Quick Bird satellite imageries. The area is characterised by the presence of gullies, hillslope scarps with knife-edge ridges called “calanchi”, and badlands, small conical hills called “biancane”, of relevant naturalistic interest that in the years underwent high agricultural activities that strongly modified their extent, morphology and erosion rates. The data, digital format, has been treated within a Geographic Information System. Ground Control Points (GCPs) needed for the orientation of satellite imageries were collected by means of DGPS measurements in static mode. The QuickBird imagery, Basic Bundle (Pan + MS) type, was elaborated by data fusion then orthorectified through rigorous methodologies by utilising ERDAS ImagineTM software. Starting from the QuickBird satellite imagery, PCI GeomaticaTM software allowed to create a synthetic image by the application of an artificial parallax proportional to the digital elevation model. Afterwards the aerial photos were oriented as well as the satellite imagery by means of digital photogrammetric techniques directed to environmental study. Digital elevation models related to the different years were calculated from the aerial photos by utilising semi-automatic techniques, whilst multitemporal databases were carried out using photogrammetric analysis. Map Analysis procedures allowed to compare the data and to rebuild the Crete’s geomorphologic evolution. The interpretation of multitemporal images related to the years 1954, 1998 and 2004 highlighted qualitative and quantitative changes in morphology and land use which have seriously compromised the naturalistic value of the Crete Senesi.
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|Titolo:||Analisi morfometriche delle Crete Senesi mediante Remote Sensing e GIS|
|Citazione:||Salvini, R. (2008). Analisi morfometriche delle Crete Senesi mediante Remote Sensing e GIS. MEMORIE DESCRITTIVE DELLA CARTA GEOLOGICA D'ITALIA, 78, 245-252.|
|Appare nelle tipologie:||1.1 Articolo in rivista|