a. Number of visible turbines
b. Proportion of visible turbines
c. Distance-weighted proportions

Figure 11.7 Three colour representations of ZVIs as measures of visual impact of the Taff Ely Wind Farm over a DTM surface of 22 km by 22 km

Book Source: Chapter 11, page 220: GIS and Wind Farm Planning David Kidner, Andrew Sparkes and Mark Dorey in Geographical Information and Planning edited by John Stillwell, Stan Geertman and Stan Openshaw, Springer Verlag, Heidelberg, 1999.

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