According to current legislation, Environmental Impact Assessment (EIA), a procedure that includes Landscape among possible receivers of effects produced by human activities, is necessary to achieve great engineering buildings. EIA, introduced in Europe by 377/85 CEE Directive and integrated and updated by 11/97 CEE Directive, is very important implement to avoid that natural resources, usability and identity of landscape are compromised. The analysis of intervisibility contributes to achieve visual impact statement: by fixing observation points it is possible to establish the entity of perceptions of the morphological modifications introduced by engineering opera. Digital Terrain Models (DTMs) allow to realize Thematic Maps to distinguish territory in reference to intervisibility, supporting opera planning and localization. In this paper, GIS methodological aspects are discussed to identify impacts on landscape. In particular, the study on analysis of intervisibility about Eolic Park in Durazzano (Benevento, Italy) is shown: the visual interaction capacity of wind turbines is defined by using software ArcGIS 9.2 (ESRI). The attention is focalized on Map Algebra functions and effects produced by the curvature of the earth surface and geodetic refraction.
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