A | Reverse-viewshed frequency analysis | Analyzes the viewshed of the surroundings from the target area, contrary to previous methods | • Reverse the viewshed analysis • Select points with view concerns as LCPs | • Improves accuracy of landscape impact assessment • Reduces unnecessary LCPs to be selected |
B | Viewshed frequency analysis | An analysis presented as an arithmetic operation of the frequency analysis of multiple viewpoints Multiple LCP to viewshed analysis | • Presents results of the viewshed frequency analysis from multi-layered multiple viewpoints as frequency using an arithmetic operation | • Convenient to determine significance of the viewshed in a large apartment complex or a new town • As it is represented as frequency, it is possible to identify important observation locations |
C | Sight-surface analysis | Analyzes the difference between line of sight and topographic heights difference analysis in height between the sight-surface and terrain | • Analyzes the difference between topographic heights and line of sight from where a viewer observes the view target frequency analysis of multiple LCP to viewshed analysis | • Line of sight: an imaginary line to project the sight of a viewer • Surface of sight: A surface consisting of a number of lines of sight |
D | Sequence sight-surface analysis | Analyzes the difference between line of sight and topographic heights from a multi-viewpoint | •Identifies criteria for views and multi-viewpoint • Sets minimum and maximum view lines within the view distance and identifies an angle where the two lines cross at the spot of equal height | • Provides objective results of the plan for mountainous skylines • Used to regulate the height of buildings |