The question of scale, the question about scale

1) When the mapping area is relatively small, the difference between the spherical surface and the plane can be ignored, at this time, no matter what kind of projection is used, the ratio of the length reduction of each place on the map can be regarded as equal, at this time, the meaning of the scale is: the ratio of the length on the map to the corresponding horizontal length of the ground;

2) When the mapping area is quite large, and the difference between the sphere and the plane is gradually obvious, there will inevitably be an uneven shrinkage, and different scales will appear, only individual points (lines) will not be deformed in length, and the scales on these non-deformed points (lines) are called the main scale, and other scales greater than or smaller than the main scale are called local scales.

Map scale on map

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 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.

When drawing maps and other plans, it is necessary to reduce or expand the actual distance in a certain proportion before drawing the drawing, and then determine the ratio of the distance on the map to the corresponding actual distance.

The ratio of the distance on the graph to the actual distance is called the scale of the diagram.

Distance on the graph: Actual distance = scale.

or Distance on the graph.

—= Scale bar.

Actual distance.

1. What is a scale? The scale bar is the degree to which the distance on the map is reduced compared to the distance on the ground. Scale bar = distance on the graph Field distance, which is a ratio.

There are units for the distance on the map and the distance from the field, but the units must be the same, and the units can be regarded as approximately separated, so the scale has no units.

2. On our common map, the unit of distance on the map is generally centimeters, and the unit of distance on the ground is generally meters or kilometers. Conversion? What does it mean?

Let's take an example, but I don't know if it's suitable or not. For example, if the linear scale is 1 5 kilometers, and the digital scale is 1 500000, here, the units of 1 and 500000 can be regarded as centimeters, that is, 5 kilometers are converted into 500,000 centimeters, of course, it can also be said: "1 centimeter on the map represents the distance of the field 5 kilometers".

3. As I just said, the scale bar = the distance on the diagram The distance from the field, you can see the scale bar as a fraction with a numerator of 1, for example, the scale bar 1 500000 is a fraction, therefore, the size of the scale bar is the size of the comparison score, which fraction is larger, which scale bar is larger. Some scales are numerical, line-segmented, and textual, which requires all kinds of scales to be digital, which is more conducive to comparison.

4. For the map with the same sheet, the larger the scale, the smaller the range just represented, and the more detailed the map content; The smaller the scale, the larger the representation and the more concise the map content. For example, a map of the world and a map of Beijing on the same sheet, the scale of the world map is smaller, while the scale of the map of Beijing is much larger, and we can find Xihe Garden, the Forbidden City, Chaoyang Park and ...... on the map of BeijingOn the world map, Beijing is represented by a very small dot. Obviously, the larger the scale, the more detailed it represents.

Yes, cm kilometers to centimeters plus 5 0 fractions and then compare.

The scale bar bai represents a line segment on the graph.

The ratio of the length of the DU to the actual length of the DAO of the corresponding line segment of the ground surface. Scale gyback = the ratio of the distance on the graph to the distance between the actual answer. (Scale bar = distance on the figure: actual distance).

Scale Formula:

Distance on the graph: Actual distance = scale.

Actual distance = distance on the graph scale.

(Scale bar = distance on the figure: actual distance). (In the scale calculation, it is necessary to pay attention to the conversion between units) (1 km = 1 km = 1 1000 m = 1 100000 cm) unit conversion: use centimeters on the map, use kilometers in the field, exchange centimeters for kilometers, and remove five zeros; Kilometers for centimeters, plus two zeros on the basis of thousands.

The scale bar represents the ratio of the length of a line segment on the diagram to the actual length of the corresponding line segment on the ground. Scale bar = the ratio of the distance on the graph to the actual distance.

1. There are three ways to represent the scale:

1) Numeric (also known as digital scale), which uses the scale of numbers or fractions to express the size of the scale. For example: 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 type, directly write 1 cm on the map on the map to represent the distance of the field, such as: 1 cm on the map is equivalent to 500 meters of the ground distance, or 1/50,000.

2. Scale formula:

Distance on the graph: Actual distance = scale.

Actual distance = distance on the graph scale.

(Scale bar = distance on the figure: actual distance). (Pay attention to the conversion between units in the scale calculation).

1 km = 1 km = 1 1000 m = 1 100000 cm).

Unit conversion: centimeters on the map, kilometers on the field, centimeters for kilometers, five zeros; Kilometers for centimeters, plus two zeros on the basis of thousands.

Hello! The ratio of the distance on the top of a picture to the actual distance is called the scale of the picture.

(Scale bar = distance on the figure: actual distance).

The ratio of the distance on the graph to the actual distance is called the scale bar.

The ratio of the distance on the graph to the actual distance is the scale bar.

2. There are three ways to represent the scale: numerical scale, graphic scale and text scale. Generally speaking, large-scale maps are detailed and geometrically accurate, and can be used for on-map measurements. Small-scale maps are highly generalized and not suitable for on-map measurements.

1. The scale is 1:300, so 1 cm on the drawing represents 3 meters, so: the diameter of the bottom surface of the cylindrical pool is 8x3 = 24 meters, and the depth is 5 3 = 15 meters, so the volume of the cylindrical pool (maximum water capacity) = 12 12 15 = cubic meters.

2. Because the distance between two cities is l=60 km, 12 hours=720 km, so the time it takes for another car to drive from city A to city B at an average speed of 50 kilometers per hour t=720 50=hours.

1) The diameter of the bottom surface of the pool is 8 cm and the depth is 5 cm on the design drawing of the cylindrical pool at a scale of 1:300.

Then the actual bottom diameter is 2400cm=

24 meters deep 5 300 = 1500 cm

15 meters. Volume = 12 12 15 = 2160

Cubic meters 2) 60 12 50 =

depending on the distance the same).

(Scale bar = distance on the figure: actual distance).

1:100=7200: the actual distance.

Actual distance = 100 * 7200 = 720000

If you give a unit of 7200 in millimeters, the actual distance is 720000 millimeters, or 720 meters.

1:50=50: Actual distance.

Actual distance = 50 * 50 = 2500

If the unit of 50 you give is millimeters, the actual distance is 2500 millimeters, i.e. meters.

Length: 300x100/100 = 3 cm.

Width: 120x100/100 = cm.