Which analysis technique involves determining the visibility from a specific point?

Viewshed analysis is the correct answer because it specifically focuses on determining the areas that are visible from a particular point, taking into account the terrain and other obstructions that may block the line of sight. This technique is widely used in landscape planning, telecommunications, and environmental studies to evaluate visibility for various applications, such as site selection for towers or understanding scenic views.

In contrast, buffer analysis involves creating a zone around features to identify proximity, which does not directly assess visibility. Cost distance analysis evaluates the least-cost path or movement across a landscape, incorporating factors like terrain resistance but not specifically addressing visibility. Network analysis examines relationships and flows within a network, such as transportation routes, rather than the direct visibility from a point. Thus, viewshed analysis uniquely provides insights into visibility considerations in spatial analysis.