Utilizzo di immagini satellitari ad alta risoluzione per il monitoraggio delle superfici tagliate a raso in boschi cedui
Author(s)
Giuliarelli, Diego
Date Issued
February 10, 2009
Type
Doctoral Thesis
Abstract
The aim of this work is to test the potential of high resolution satellite images for monitoring coppice
clearcuts in central-southern Italy. Through integration of a multitemporal set of multispectral SPOT5
images and ancillary information, a clearcuts map is produced by on-screen interpretation and subsequent
digitalization in GIS environment.
Official clearcut declarations by forest owners, collected by the national forest authority (Corpo Forestale
dello Stato), are gathered for the same area and same years of satellite data acquisition.
The obtained maps are used for assessing eventual differences with wood harvesting data of the National
Statistic System (ISTAT). The comparison between the two kinds of data, carried out on a sample of 1127
administrative units, highlights a significant underestimation of the official statistics, with an average ratio
between clearcut area observed by SPOT5 and the corresponding administrative statistics equal to 1,41.
The underestimation by the administrative data is likely due to the simplified process of authorization of
coppice clearcuts as well as the eventual lack of timeliness and/or loss of data that sometimes hinder the
information flow from administrative bodies to national forest authority, that is in charge of feeding the
official forest statistics.
In the light of the experimentation carried out, an operational procedure by SPOT5 images is proposed for
the statistical calibration of the administrative data on wood harvesting.
Mapping by on-screen interpretation is also used for assessing the thematic accuracy of clearcut maps
produced by semi-automatic classification procedures, experimentally developed with reference to various
nomenclature systems and input dataset. Experimentation results highlight the potential of object-oriented
classification techniques for clearcuts semi-automatic delineation, whereas the pixel-oriented procedure
application has proven to be unsuitable.
Additional information
Dottorato di ricerca in Ecologia forestale
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