Efficient Statistical Sample Designs in a GIS for Monitoring the Landscape Changes

The process of land planning, addressed to operate the synthesis between development aims and appropriate policies of preservation and management of territorial resources, requires a detailed analysis of the territory carried out by making use of data stored in Geographic Information Systems (GISs). A detailed analysis of changes in the landscape is time consuming, thus it can be carried out only on a sample of the whole territory and an efficient procedure is needed for selecting a sample of area units. In this paper we apply two recently proposed sample selection procedures to a study area for comparing them in terms of efficiency as well as of operational advantages, in order to set up a methodology which enables an efficient estimate of the change in the main landscape features on wide areas.