Specific indicators for each scale. The level of spatial organi-sation being studied determines the methods that have to be used.For each situation (Fig. 1), the response to the question of scalechange is provided by a change of data and, consequently, of theenvironmental indicators specific to each spatial level (Riley, 2001;Stein et al., 2001). This is the main type of study carried out todate by the different authors. Indicators are built at different levels:parcels of land, farms, watersheds, and administrative territories(Macary et al., 2007).