Graphical projection Perspective projection is a linear projection where three dimensional objects are projected on a "picture plane". This has the effect that distant objects appear smaller than nearer objects. It also means that lines which are parallel in nature (that is, meet at the point at infinity) appear to intersect in the projected image, for example if railways are pictured with perspective projection, they appear to converge towards a single point, called vanishing point. Photographic lenses and the human eye work in the same way, therefore perspective projection looks most realistic. Perspective projection is usually categorized into "one-point", "two-point" and "three-point
Point-to-point Lee model dipole antenna (dBd). formula_10 where, "f" = Frequency. Unit: megahertz (MHz) This is computed in the following way: Point-to-point Lee model The Lee model for point-to-point mode is a radio propagation model that operates around 900 MHz. Built as two different modes, this model includes an adjustment factor that can be adjusted to make the model more flexible to different regions of propagation. This model is suitable for using in data collected in a specific area for point-to-point links. Frequency: 900 MHz band The Lee model for point to point mode is formally expressed as: formula_1 where, "L" = The