In the higher part of many Italian alpine regions the population is rapidly decreasing. This fact directly influences landscape and forest management criteria. In particular, large pastures and agricultured areas are being covered by trees or bushes, which change the landscape. This is a well known trend but it is very difficult to evaluate the extension and the evolution of these phenomena. A new approach to this problem has been developed at the Laboratorio Ambiente e Territorio, which makes possible to determine changes of the forested areas over time. Series of aerial photographs taken in different years (1954, 1980, 1994) have been compared using automatic algorithms which exploit the GRASS GIS (Grass GIS is a public domain Geographic Information System) image analysis capability. This method has proved to be effective for the automatic determination of the widening of the forested areas. A precise knowledge of the forest coverage evolution is very precious to enhance forest and landscape management criteria. It can also be combined with demographic information to better explain landscape change. Further investigations have been carried out to provide a photgrammetric tecnique for the determination of the growing stock. Such tecnique has already been set up in the ’50 and in the ’60 using ad hoc photogrammetric surveys with mean scale of 1:10.000 and 1:20.000 for flat areas and plantations. In this work an effort has been made to apply these technique to sparse forests of spruce and larch in mountain areas using panchromatic images with mean scale 1:40.000. Measurements on the images of the single trees have been checked against the data from forest management plans for the Trentino region.

Valutazione tramite fotogrammetria e GIS della dinamica della copertura forestale e della provvigione legnosa

SGUERSO, DOMENICO;
1999-01-01

Abstract

In the higher part of many Italian alpine regions the population is rapidly decreasing. This fact directly influences landscape and forest management criteria. In particular, large pastures and agricultured areas are being covered by trees or bushes, which change the landscape. This is a well known trend but it is very difficult to evaluate the extension and the evolution of these phenomena. A new approach to this problem has been developed at the Laboratorio Ambiente e Territorio, which makes possible to determine changes of the forested areas over time. Series of aerial photographs taken in different years (1954, 1980, 1994) have been compared using automatic algorithms which exploit the GRASS GIS (Grass GIS is a public domain Geographic Information System) image analysis capability. This method has proved to be effective for the automatic determination of the widening of the forested areas. A precise knowledge of the forest coverage evolution is very precious to enhance forest and landscape management criteria. It can also be combined with demographic information to better explain landscape change. Further investigations have been carried out to provide a photgrammetric tecnique for the determination of the growing stock. Such tecnique has already been set up in the ’50 and in the ’60 using ad hoc photogrammetric surveys with mean scale of 1:10.000 and 1:20.000 for flat areas and plantations. In this work an effort has been made to apply these technique to sparse forests of spruce and larch in mountain areas using panchromatic images with mean scale 1:40.000. Measurements on the images of the single trees have been checked against the data from forest management plans for the Trentino region.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/201455
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