Summary

Spatial visibility detection

Geographic Information System (GIS) developers come across number of various tasks ant the computers using the specialized software might ease the solution. One them is detection of direct spatial visibility. The essence of this task is to check if one spatial point can be seen from a given position. Research point’s altitude, coordinates and the information about the objects in surrounding are given. Spatial visibility may not exist if there are objects intersecting the ray from the viewpoint to researched point. Intersecting objects may be buildings, roughness of surface as well as trees and other higher object in area. Detection of direct spatial visibility is essential for transmission of high and medium frequency radio waves or optical signals.

To fulfill this task the program will be developed with which assistance the zones of direct spatial visibility can be obtained. The possibility to work with several viewpoints also should be provided. The program would help to find out the heights, positions and quantity of the transmitter aerials to optimize the visible area.

Initial data is the altitudes of buildings and surface in researched area. The data is given in text files created by Arc/Info system.

Raktažodžiai: information technologies, informacinės technologijos