Viewshed Analysis

Function Overview

The Viewshed Analysis tool determines whether each pixel value in the terrain data is visible based on a series of viewpoint data.

Usage

Click on Terrain > Viewshed Analysis.

Parameter Settings

• Input DEM File: The input DEM file. For information on generating a DEM, see DEM Generation.
• Observer Points File: Input point-type vector file representing the positions of observation points.
• Observer Height: The height of the observer relative to the viewpoint.
• Radius: The radius for the viewshed analysis.
• Target Height: The height value of all visible terrain areas checked from the observation point.
• Analysis Type: Determines the output result:
  • 0: Binary Perspective; visible areas are 1, non-visible areas are 0.
  • 1: Depth Below the Horizon ; the height each location needs to reach to be visible.
  • 2: Horizon Boundary; the edges of the viewshed.
• Use Curvature: Whether to consider the curvature of the Earth.
• Atmospheric Refraction: Also known as the vertical refraction coefficient, describing the atmospheric refraction rate factor affecting visibility.
• Combining Type: When using multiple observation points, the outputs will be combined based on this parameter.
• Output Path: Specifies the path for the output results.