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The line of sight, also known as visual axis or sightline (also sight line), ... at any distance more than least distance of distinct vision. In optics, ...
The distance s can also be expressed in terms of the line-of-sight distance d; ... Outside the visual wavelength range, refraction will be different.
Line of sight (LoS) propagation from an antenna. Line-of-sight propagation is a characteristic of electromagnetic radiation or acoustic wave propagation which means waves can only travel in a direct visual path from the source to the receiver without obstacles. [1] Electromagnetic transmission includes light emissions traveling in a straight line.
A typical example of long-distance observation. The Tatra Mountains as seen from the Łysa Góra, in southeast Poland, at a distance of about 200 km (120 mi).. Long-distance observation is any visual observation, for sightseeing or photography, that targets all the objects, visible from the extremal distance with the possibility to see them closely.
VHF transmission range is a function of transmitter power, receiver sensitivity, and distance to the horizon, since VHF signals propagate under normal conditions as a near line-of-sight phenomenon. The distance to the radio horizon is slightly extended over the geometric line of sight to the horizon, as radio waves are weakly bent back toward ...
Line-of-sight transmission on the surface of the Earth is limited to the distance to the visual horizon, which depends on the height of transmitting and receiving antennas. It is the only propagation method possible at microwave frequencies and above. [a]
This reduces the shadow zone, but causes errors in distance and height measuring. In practice, to find D h {\displaystyle D_{h}} , one must be using a value of 8.5·10 3 km for the effective Earth's radius R e {\displaystyle R_{e}} (4/3 of it), instead of the real one.
The visual contrast, C V (x), at a distance x from the black object is ... The particles scatter light from the sun and the rest of the sky through the line of sight ...