首页|Deconstructing viewshed analysis makes it possible to construct a useful visual impact map for wind projects
Deconstructing viewshed analysis makes it possible to construct a useful visual impact map for wind projects
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NSTL
The analysis of wind project visual impact assessments (VIAs) is dominated by photosimulations at a limited number of viewpoints. While wind project VIAs typically include a cumulative viewshed map, they fail to integrate information about distance zone, visible exposure and project extent into a useful measure of visual impact. As a result, the quality of the spatial analysis of visual impacts is of limited value. This study presents an approach to assessing the visual prominence of individual wind turbines based on their distance from the viewer and the turbine's visual exposure. These results provide useful guidance concerning which turbine locations should be permitted. Several ways to combine the impact of individual turbines into a map of visual impact are evaluated. The contrast rating of photosimulations at 17 viewpoints is used as the criterion to validate these maps. The results show significant improvement over the traditional cumulative viewshed map. The contrast ratings are also used to calibrate mapped levels of visual impact.
NSTL
