The aim of this study is to test the MODIS data to mapping geomorphological units in the arid system of Western Sahara. Previous observations of the authors demonstrated how remote sensing data help in the reconstruction of palaeo-geography and climatic fluctuation during the Quaternary. In this study we propose the integration of multispectral, multisensor bands and DEM data for the interpretation and mapping of the phenomena. The analysis was done in two steps:spatian analysis by photointerpretation of MODIS and Landsat images modeled on tridimensional views; application of spectral classification of MODIS emissivity band acquired in nightime. The spectral angle mapping classification was performed on the dataset to map the limit of cemented sand dunes. The classified areas represent the most important units affected by climate changes. The Western Sahara is interested by a large oued system actually cutted by the erg; these areas may be an interresting sites to collect samples for dating and to reconstruct the Holocene climate fluctuation
Metodologie di analisi dei dati MODIS per la redazione di cartografie tematiche geomorfologiche.
MELIS, MARIA TERESA;
2005-01-01
Abstract
The aim of this study is to test the MODIS data to mapping geomorphological units in the arid system of Western Sahara. Previous observations of the authors demonstrated how remote sensing data help in the reconstruction of palaeo-geography and climatic fluctuation during the Quaternary. In this study we propose the integration of multispectral, multisensor bands and DEM data for the interpretation and mapping of the phenomena. The analysis was done in two steps:spatian analysis by photointerpretation of MODIS and Landsat images modeled on tridimensional views; application of spectral classification of MODIS emissivity band acquired in nightime. The spectral angle mapping classification was performed on the dataset to map the limit of cemented sand dunes. The classified areas represent the most important units affected by climate changes. The Western Sahara is interested by a large oued system actually cutted by the erg; these areas may be an interresting sites to collect samples for dating and to reconstruct the Holocene climate fluctuation
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