Landscape visibility computation: necessary, but not sufficient

In this essay we review the major developments in the history and techniques of landscape visibility analysis, providing a number of examples and identifying a few critical challenges to the community of those who would seek to evaluate visibility -- and related characteristics such as visual quality or preference -- in landscapes. We argue that visibility per se is a necessary prerequisite, but insufficient in itself, as a basis for the common planning, design, and public policy questions in the context of which many visibility analyses are instigated.