Scale bar Representation There are three expressions of scale

The ratio of the length of the line segment on the map to the length of the corresponding line segment in the field. It indicates how much the map shape is reduced, also known as a scale. For example, 1 100,000, that is, the length of 1 cm on the map is equivalent to 100,000 cm (i.e. 1,000 meters) in the field.

Strictly speaking, the scale of the whole map is consistent only on large-scale maps that represent small areas, because the curvature of the earth is not taken into account. The scale that is usually drawn on the map is called the main scale. On the map, only certain lines or points conform to the primary scale.

Scale is related to the level of detail and precision of the map content. Generally speaking, large-scale maps, with detailed content and high geometric accuracy, can be used for on-map measurements. Small-scale maps are highly generalized and not suitable for on-map measurements.

The forms of expression include numerical (such as 1 100000), illustrative (as shown in the figure 1 cm is equal to 1000 meters on the ground) and ** (divided into straight line scale, oblique scale and compound scale). **Scale bar for easy measurement. The scale is fixed only on large-scale maps with limited areas.

In addition, for maps with little or small length distortions, a single scale is sufficient, and on large areas and maps with large differences between the main scale and the local scale, it is a good idea to indicate some map grids or lines that maintain the main scale. Map scales are an essential mathematical basis for mapping and map use, and they affect the level of detail of the map content. Generally speaking, the larger the scale of the map, the smaller the error, and the higher the measurement accuracy on the map.

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Three forms

1) Numeric formula, which uses the scale formula or fractional formula of numbers to express the size of the scale bar. For example, 1 centimeter on a map represents a distance of 500 kilometers from the field, which can be written: 1 50 000 000 or 1 in 50 million.

2) Line segment type, draw a line segment on the map, and indicate the actual distance represented by 1 cm on the map.

Scale bar

The scale bar represents the ratio of the length on the diagram to the actual length, and generally has three forms of description: text scale, numerical scale, and line segment scale.

Text scale: 1cm on the map represents the distance of 50km from the field.

Numerical scale: 1:5000000, which means 1cm on the map, represents the distance of 5000000cm (50km) on the map.

Line Segment Scale: The length of a line segment on the diagram indicates how long the distance actually is.

There are three types of representation of scale: numeric type, line type type, and text type.

Scale = distance on the map Distance from the field; Distance on the graph = distance from the ground Scale bar; Field distance = distance on the map scale.

For maps with pointers, the arrows point to due north, and they should be translated before determining the direction.

The number marked on the contour line is the altitude of the place through which the contour line passes; Contour distance c is the elevation difference between two adjacent contour lines on the contour topographic map, and the whole map is consistent;

On the same isoline, the altitude is the same;

The relative altitude is the difference between the two places.

The State Surveying and Mapping Department has designated eight scale topographic maps of 10,000, 10,000, 150,000, 1,100,000, 1,250,000, 1,500,000 and 11,000,000 as national basic scale topographic maps, referred to as basic topographic maps, also known as national basic maps, to ensure that the basic needs of various departments are met. Where:

1. Large-scale topographic maps: topographic maps from 15,000 to 1,100,000;

2. Medium-scale topographic maps: 1.25 million and 1.5 million topographic maps;

3. Small-scale topographic maps: 11 million topographic maps.

4. Scale in daily life such as: map, drawing, surveying, field, aviation, highway, navigation, architecture.

There are three forms of scale: numerical, line-segmented, and textual, the characteristics are:

1. Digital (also known as digital scale): The size of the scale is expressed by the scale or fraction of the number. Such as 1 50,000,000, or 1 50,000,000.

2. Line segment (also known as scale): Draw a line segment on the map and indicate the actual distance represented by 1 cm on the map.

3. Textual formula: directly write 1 cm on the map on the chain or take the map to represent the distance of the field, such as: 1 cm on the map is equivalent to 500 meters on the ground, or 1/50,000.

Depending on the purpose of the map.

The size of the area represented, the size of the map sheet and the details of the content of the representation are different, and the scale used for drawing varies from large to small. The numerator in the map scale bar is usually 1, and the larger the denominator, the smaller the scale.

Maps that are usually larger than 1/100,000 are called large-scale maps; Maps with a scale between 1/100,000 and 1/1 million, are called medium-scale maps; Maps that are less than one millionth larger than the shed-building ruler are called small-scale maps. The role of scale in topographic maps is as follows:

1. The indispensable mathematical foundation for surveying and using maps.

2. Reflect the measurement accuracy of the map.

3. Reflect the level of detail of the map content.

Question 1: What is a scale and what is the meaning of the scale A scale often indicates the degree to which the distance on the map is reduced compared with the distance on the ground, which is also called a scale. The formula is:

Scale = distance on the map Distance from the field; There are three types of scale representations: numeric format, line segment format, and stool type type.

Question two: What is the meaning of a scale bar.

Pinyin]: bǐ lì chǐ

Explanation]: Basic Explanation: (1) The ratio of the length on the drawing to the actual length it represents. It is used to draw maps, engineering drawings, etc.

2) When drawing, attach the numbers and line segments that represent the scale on the edge of the drawing. (3) A tool used for cartography, on which there are several scales of different proportions.

Example sentence]: Through large-scale plane geological mapping, profile measurement and microstructure analysis, the stone bubble structure in the rhyolite of Jiutaiyingcheng coal mining area is developed.

Question 3: What is the scale (e.g. 1:1000

Question 4: What does scale 1:200 mean? 1 cm on the map represents the actual 200 cm jujube Xinchang.

Question 5: What does the scale of 1:150 mean? It is actually 150 times the size of the figure.

Question 6: What does a scale of 1:2000 mean? It means that 1 cm on the diagram represents the actual 2000 cm.

There are three ways to represent scales: numerical scales, pictorial scales, and text scales.

1. Digital:

Numeric is also known as a numeric scale, which uses the scale of numbers or fractions to represent the size of the scale. For example: 1 50000000, or 1 50000000.

2. Line segment type:

Line segmentation, also known as scale, draws a line segment on a map and indicates the actual distance represented by 1 cm on the map.

3. Textual style:

On the map, write directly on the map that 1 cm represents the distance from the field, for example: 1 cm on the map is equivalent to 500 meters from the ground, or 1/50,000 of the hand mask.

How to use the scale bar:

According to the scale on the map, the physical distance between two places on the map can be measured; According to the actual distance and scale of the two places, the distance on the map of the two places can be calculated; The scale can be calculated based on the distance on the map and the actual distance between the two places.

Depending on the purpose of the map, the size of the area to be represented, the size of the map sheet, and the details of the content of the map, the scale used for mapping varies from large to small. The numerator in the map scale bar is usually 1, and the larger the denominator, the smaller the scale. Maps with a scale greater than 1/100,000 are called large-scale maps; Maps with a scale between 1/100,000 and 1/1 million, are called medium-scale maps; Maps with a scale of less than one part per million are called small-scale maps.

Three representations of the scale bar on the map.

1) Line segment: Draw a line segment in the legend and indicate the actual distance represented by 1 cm.

2) Textual formula: Write 1 cm directly on the map to indicate the actual distance of how many kilometers.

3) Numeral, 1: 100000000 or 1 10000000), the unit is not indicated later.

The representation of the scale bar mainly includes numeric, line-segment and textual The most commonly used representation is line-segment

Therefore, the answer is: the representation of the scale bar mainly includes numeric form, line segment type and text type; The most commonly used representation is linear.