"Reading Maps" Earth and Maps PPT Courseware 7

"Reading Maps" Earth and Maps PPT Courseware 7

Basic elements of map reading - scale

The scale bar on the map indicates the degree to which the distance on the map is smaller than the distance on the ground, so the scale bar is also called a scale bar.

Calculation of scale

Given the distance on the ground and the distance on the map, find the scale: Scale = distance on the map/distance on the ground

Given the scale and real distance, find the distance on the map: distance on the map = real distance × scale

Given the distance on the map and the scale bar, find the distance on the ground: distance on the ground = distance on the map/scale bar

Compare the sizes of scale bars:

The scale is a fraction. The larger the denominator, the smaller the scale; the smaller the denominator, the larger the scale.

Which of the following scales is the largest?

A：1：6 000 00

B: 1 centimeter represents a physical distance of 50 kilometers

C: 0___100 kilometers

In the case of the same map size, the larger the map scale, the smaller the range to be represented and the more detailed the content to be represented.

On the contrary, the smaller the scale of the map, the larger the range to be represented and the simpler the content to be represented.

1. Orientation of general maps

Give it a try:

1. In which direction is the rhinoceros pavilion located from the panda pavilion?

2. In which direction is the small animal area located in Liger Mountain?

2. Point to the landmark map for orientation

Give it a try:

1. In what direction is a located from b?

2. In what direction is b located in c?

Still the same question, can you do it again?

After what you just learned, what do you think are the ways to determine the direction on the map?

1. General method: up, north, down, south, left, west, right, east

2. Pointing method: The direction of the pointing arrow is true north, and then determine other directions.

3. Meridian network method: Meridians indicate the north-south direction, and latitude lines indicate the east-west direction. The North Pole indicated by the longitude is true north, and the opposite direction is true south.

summary

Direction, Beacon, Graticulus and Latitude, General Orientation

Scale, calculation formula, representation, distance measurement

Legend Symbol Text Number

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