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Lambert map projection presentation device and method

A demonstration device and map projection technology, applied in the directions of maps/plans/charts, planetariums/globes, instruments, etc., can solve problems such as poor teaching effect, and achieve the effect of improving teaching effect, simple design and production, and convenient material selection.

Inactive Publication Date: 2016-05-04
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the teaching level, enhance the intuition, vividness and interest of map projection teaching, change the existing teaching methods, and solve the problem of poor teaching effect, the present invention provides a Lambert map projection demonstration device, which is used to demonstrate The whole process of Lambert's conformal conic projection enables students to intuitively observe the whole process of the conversion of ground features from spherical to plane, and understand the deformation properties and characteristics of Lambert's conformal conic projection

Method used

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  • Lambert map projection presentation device and method
  • Lambert map projection presentation device and method

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Embodiment 1

[0019] Such as figure 1 As shown, the Lambert map projection demonstration device of this embodiment is composed of a base 1 , a perspective paper cover 2 , a light bulb 3 , a globe main body 4 and a deformation verification triangle 5 .

[0020] Specifically: the base 1 of the present embodiment adopts an ordinary desk lamp base 1, and a light bulb 3 is installed on the base 1, and a globe main body 4 is also installed outside the light bulb 3, and the light bulb 3 is installed at the center of the earth of the globe main body 4. The main body 4 of the globe is composed of a globe skeleton and a polyester film with good light transmission, wherein the globe skeleton is a simple globe skeleton that is lapped with thin iron wires according to the longitude and latitude lines to form a spherical mesh structure, the bottom is fixed on the base 1, and the top is Use pins to fix the joints of the overlapped thin iron wires. The top of the globe frame is fixed with pins. The size is...

Embodiment 2

[0029] The deformation verification triangle of this embodiment is an equilateral triangle with a side length of 20mm, and its sticking position is on the lower hemispherical surface close to the South Pole.

[0030] Satisfy between the busbar length l of the perspective drawing cover 2 of the present embodiment and the equatorial radius R of the globe main body 4:

[0031] α = 2 a r c t g ( R l )

[0032] Wherein α is the cone angle of the transparent paper cover 2, α=75°.

[0033] The other components and their mounting configurations are the same as in Embodiment 1.

Embodiment 3

[0035] The deformation verification triangle in this embodiment is an equilateral triangle with a side length of 20 mm, and its sticking position is on the upper hemispherical surface close to the North Pole.

[0036] Satisfy between the busbar length l of the perspective drawing cover 2 of the present embodiment and the equatorial radius R of the globe main body 4:

[0037] α = 2 a r c t g ( R 1 )

[0038] Wherein α is the cone angle of the transparent paper cover 2, α=30°.

[0039] The other components and their mounting configurations are the same as in Embodiment 1.

[0040] In the foregoing embodiment, the deformation verification triangle 5 can be adjusted in position according to the actual situation, and the angle of the triangle can also be adjusted appropriately. In the same way, the longitude and lat...

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Abstract

The invention relates to a Lambert map projection presentation device and method. A conical tracing paper cap and a tellurion body are adopted to simulate the Lambert projection effect, light is emitted from the core of earth and projected on the tracing paper cap through a polyester film of the tellurion body, the projection line is traced with a pen, and the plane condition after Lambert orthomorphic conical projection can be obtained after the tracing paper cap is unfolded. Meanwhile, the deformation property of Lambert projection is explained visually by means of a deformation verification triangle. Besides, materials are convenient to take, designing and manufacturing are convenient, abstract theory teaching can be made visualized and vivid so as to attract the attention of students, and then the cartography teaching effect is improved greatly.

Description

technical field [0001] The invention belongs to the technical field of teaching and demonstration teaching aids in colleges and universities, and in particular relates to a Lambert equiangular conic map projection demonstration device and a demonstration method. technical background [0002] A map is a graphic that selectively represents several phenomena of the earth (or other planets) on a plane according to certain rules. It has a strict mathematical foundation, symbol system, and text annotations, and can use maps to summarize principles and scientifically reflect natural phenomena. The distribution characteristics of social and economic phenomena and their interrelationships. Map projection is the theory and method of converting spherical coordinates longitude and latitude to a plane by using certain mathematical rules. Since the earth is an irregular sphere slightly wider at the equator and slightly flatter at the two poles, and its surface is a non-developable curved...

Claims

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Application Information

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IPC IPC(8): G09B27/08G09B29/00
CPCG09B27/08G09B29/003
Inventor 郭斌
Owner XIAN UNIV OF SCI & TECH
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