Line-of-sight Analysis has important application value in navigation, aviation and military affairs, such as setting up radar stations, transmitting stations of TV stations, road selection, navigation, etc. In military affairs, such as setting up positions, setting up observation posts, laying communication lines, etc; Sometimes it is possible to analyze the invisible area. For example, when a low-altitude reconnaissance aircraft is flying, it is necessary to avoid the capture of enemy radar as much as possible, and the aircraft should choose the radar blind area to fly. There are two basic contents of Line-of-sight Analysis: one is Visibility Analysis between two or more points; the other is Viewshed Analysis, that is, for a given observation point, analyze the area covered by the observation.

Viewshed Analysis

The viewport is the range of the earth's surface that can be seen from one or more observations. Viewshed Analysis is to find the intervisibility coverage area of a given observation point within a given range based on a certain relative height for a given observation point on Raster DataDataset, that is, the intervisibility area range of the given point. Analyst Result is a Raster Dataset. Determine the location of transmission towers, the area of radar scanning, and establish forest fire prevention? Viewshed Analysis will be used when t watchtower. Viewshed Analysis is widely used in navigation, aviation and military.

Visibility Analysis

According to the number of observation points, the SuperMap Surface Analysis provides 2-Point Visibility Analysis and multi-Point Visibility Analysis respectively.

Two-Point Visibility

2 — The Point Visibility Analysis is used to analyze whether any two points on the grid surface can see through each other.

Multi-Point Visibility

Multi-point analysis is used to analyze whether multiple points on the grid surface can see each other.

Remark

• If the terrain visibility or Viewshed analysis is performed in 3D Scene, the analysis can be performed only when the "Terrain Scale Factor" is 1 to ensure that the results are correct.