Measurement by angular values of objects. Tourist tips

TOURIST ADVICE
Free library / Directory / Tourist tips

Measurement by angular values of objects. Tourist tips

Tourist tips

Distances can be approximated by angular magnitude of visible objects, if their linear value is known in advance.

The apparent, or apparent, magnitude of an object depends on the angle of view, or on the angular magnitude of that object, which decreases as it moves away from the eye and increases as it approaches the observer.

If the heights or size of the object P, the size of the improvised object H and the distance to it L are known, then the distance D to the object P can be determined by the formula

D/P=L/N,

whence D=L * P/N

If we take the L / N ratio as a constant value equal to 100, and the value of P as a variable equal to, for example, 3 m, then the distance D will be equal to 100x3 \u300d XNUMX m.

As a constant distance from the observer's eye to the object H, for convenience, take the length of the outstretched arm L, equal to approximately 60 cm.

Then the value of the object H at a constant value of the ratio L / P = 100 should be equal to 60/100 = 0,6 cm = 6 mm, i.e. approximately the width of a faceted or the diameter of a round pencil.

Example. We see a cyclist whose height is assumed to be 1,75 m. We put a pencil horizontally in front of us at arm's length. We see that in its thickness it exactly covers the cyclist. Then the distance to it is 1,75X100=175 m.

If a pencil covers an object with a height of 2 times the average height of a person, then the distance is approximately 2x1,75x100 = 350 m.

If there is no object 100 times smaller than the length of the outstretched arm, you can use random objects that are in a different ratio with the length of the outstretched arm.

Name of items	Average item size
Average pedestrian height	1,75 m
Average man step	75 см
The height of the part of the shod leg from the ground to the knee	50 см
Arm span from the middle of the chest to the base of the fingers	71 см
The width of two palms, clenched into fists, with thumbs extended towards	30 см
The length of the part of the arm from the elbow to the bones of the fingers of the clenched fist	35-40 see
A solution between the ends of the thumb and forefinger	18 см
Outstretched arm length	60 см
The length of a sapper shovel with a handle	1,10 m
The length of the bike or its height with the cyclist	1,75 m
Horse length	2,13 m
Rider Height	2,50 m
Passenger car, body height and length	1,60 and 4,2 m
Truck body height and length	2,00 and 5,5 m
Height and length of a passenger railway car	4,25 and 24,5 m
Height and length of a freight 4-axle railway car	4,00 and 13,6 m
Height and length of a 4-axle railway tank car	3,00 and 9,0 m
Height and length of 4-axle railway platform	1,60 and 13,0 m
Railway box height	4,00 m
Railway track width	4,10 m
Railway track width	1,52 m

Author: A.E. Menchukov

We recommend interesting articles Section Tourist tips:

▪ Magnetic declination

▪ Fish

▪ Tightening noose

See other articles Section Tourist tips.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Energy from space for Starship 08.05.2024

Producing solar energy in space is becoming more feasible with the advent of new technologies and the development of space programs. The head of the startup Virtus Solis shared his vision of using SpaceX's Starship to create orbital power plants capable of powering the Earth. Startup Virtus Solis has unveiled an ambitious project to create orbital power plants using SpaceX's Starship. This idea could significantly change the field of solar energy production, making it more accessible and cheaper. The core of the startup's plan is to reduce the cost of launching satellites into space using Starship. This technological breakthrough is expected to make solar energy production in space more competitive with traditional energy sources. Virtual Solis plans to build large photovoltaic panels in orbit, using Starship to deliver the necessary equipment. However, one of the key challenges ... >>

New method for creating powerful batteries 08.05.2024

With the development of technology and the expanding use of electronics, the issue of creating efficient and safe energy sources is becoming increasingly urgent. Researchers at the University of Queensland have unveiled a new approach to creating high-power zinc-based batteries that could change the landscape of the energy industry. One of the main problems with traditional water-based rechargeable batteries was their low voltage, which limited their use in modern devices. But thanks to a new method developed by scientists, this drawback has been successfully overcome. As part of their research, scientists turned to a special organic compound - catechol. It turned out to be an important component that can improve battery stability and increase its efficiency. This approach has led to a significant increase in the voltage of zinc-ion batteries, making them more competitive. According to scientists, such batteries have several advantages. They have b ... >>

Alcohol content of warm beer 07.05.2024

Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>

Random news from the Archive

Ozmo window cleaner 24.08.2023

Innovative startup Skyline Robotics is set to change the New York skyscraper cleaning landscape with its latest creation, a robot named Ozmo. Ozmo is active in high-rise window cleaning.

At the forefront of technological advancement, this unique robot performs window cleaning tasks on Manhattan's skyscrapers with ease. In his arsenal is an innovative structure similar to a robotic arm equipped with a washing brush. But the real star of the functionality is the LiDAR camera, which allows you to monitor windows and pinpoint their location on a building.

Skyline Robotics President and COO Ross Blume explains that LiDAR creates a XNUMXD map of the building and ensures that the robot is positioned optimally to clean windows as efficiently as possible. The movements of the robot are controlled by an operator on the roof, but remote control is also provided.

The Skyline Robotics team emphasizes that the main goal of Ozmo is not to replace the human factor from cleaning work, but to introduce new technologies and reorient professionals to use modern tools. However, due to the nature of the workflow, Ozmo is able to reduce the need for a large number of workers required to maintain window facades.

Other interesting news:

▪ Three-layer image sensor with DRAM memory for smartphones

▪ quantum flute

▪ Samsung Odyssey Ark 4K monitor

▪ Working Earth Model

▪ Sea water will replace heavy metals in batteries

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Videotechnique. Article selection

▪ article Fundamentals of Immunology. History and essence of scientific discovery

▪ article Can planets collide? Detailed answer

▪ article Dismissal for violation in the field of labor protection

▪ article Clauscorrector-I. Two-stage amplifier with passive correction on lamps 6S4P, 6F12P, 6F12P. Encyclopedia of radio electronics and electrical engineering

▪ article Helicopter in reverse. physical experiment

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews