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A system for computer-aided visual impact analysis (CAVIA) has been developed. The system can be considered as having landscape data, object data, visibility and visualization subsystems. A case study of the application of the system to the evaluation of alternative transmission line routes illustrates the techniques used for data collection, visibility and visualization. The integration of a digital terrain model (DTM) and associated derived data with Landsat satellite data to guide design work and construction planning is described. Validation of visualization and other aspects of the technique based on the constructed lines and current and future developments such as image mixing are discussed. The need for the system as an aid to planning and design problems is explained.