Use of remote sensing for the delineation of surface peat
deposits south of the Venice Lagoon (Italy)
V. Nicoletti, S. Silvestri
Consorzio Venezia Nuova . Servizio Informativo, Venezia, Italy
F. Rizzetto, L. Tosi
Istituto per lo Studio della Dinamica delle Grandi Masse, CNR, Venezia,
Italy
M. Putti, P. Teatini
Dept. Mathematical Methods and Models for Scientific
Applications, University of Padova, Padova, Italy
ABSTRACT
The aim of the present study is to map the regional
extent of the peat soils using remote sensing. This is a first step of
a wider project focused on the simulation of land subsidence due
to the oxidation of organic soils in an area, the Zennare Basin,
located south of the Venice Lagoon, where this process is
responsible for a settlement rates of the order of 2-3 cm/year.
Landsat 7 ETM+, Aster and Ikonos scenes have been analyzed
using the Principal Component Analyses (PCA), the Soil
Brightness Index (SBI) calculated through a Tasseled Cap
Rotation, and supervised classifications based on the Maximun
Likelihood and Spectral Angle Mapper (SAM) algorithms. The
results, calibrated on field investigations (geomorphological
surveys and sediment sampling), allowed the classification of the
outcropping sediments and the production of an accurate
geomorphological map.
