You can draw horizon level higher or lower when you need to portray a certain angle of view. If you don’t have a cube, inscribe any object inside a virtual cube.Īs an artist, you have a creative license to make pictures other viewers will see “through your eyes”.

To define a horizon line in still-life, analyze the objects – do you see them from above or below? Find edges of a cube, for example, check where virtual lines of its edges go. In landscape it is quite easy – the eye-level of the artist is where he/she marked the horizon. You may check landscape and still-life drawings (and photos) to determine where the horizon level is in each artwork. That is why people go higher to see further : ) Even if you climb on the high mountain, it still will be at your eye level.

When you stand, it will be a bit higher when you sit. Yes, there is a rule of how to determine where the horizon level is for you as a viewer – it will always be at the level of your eyes. There is no clear region in areas with weather and heavy biological activity (rain, snow, hail, high winds, and migration).Feedback from Vladimir London and Natalie Richy The clear region is also the zone above low elevation angles with clear skies. The Clear Region is the zone that begins several kilometers beyond the radar horizon at low elevation angles. This means that the clear region extends all the way to the ground. Systems using pulse-Doppler signal processing with speed rejection set above the wind speed have no clutter zone. Pulse-Doppler radar can reduce clutter by over 60 dB, which can allow objects smaller than 1-square-foot (0.093 m 2) to be detected without overloading computers and users. Prevailing wind and weather can degrade MTI performance, and MTI introduces blind velocities. This allows objects as small as 1,000 square feet (93 m 2) to be detected. Moving Target Indication (MTI) can reduce clutter by about 35 dB. The antenna for radar with no signal processing clutter-reduction improvement is not normally aimed near the ground to avoid overwhelming computers and users. Clutter reflections can create unwanted false targets. Targets are generally much smaller, so will be masked by clutter. Without taking into account the refraction through the atmosphere, the radar horizon would be the geometrical distance D h wide will illuminate millions of square feet of surface by the time the radar pulse reaches 10 miles (16 km). This is associated with the notions of radar shadow, the clutter zone, and the clear zone.Īirborne objects can exploit the radar shadow zone and clutter zone to avoid radar detection by using a technique called nap-of-the-earth navigation. It is associated with the low elevation region of performance, and its geometry depends on terrain, radar height, and signal processing. The radar horizon is a critical area of performance for aircraft detection systems that is defined by the distance at which the radar beam rises enough above the Earth's surface to make detection of a target at the lowest level possible. For broader coverage of this topic, see Radio horizon.

High horizon line