"Reading Maps" Earth and Maps PPT Courseware 9

Description

"Reading Maps" Earth and Maps PPT Courseware 9

learning target

1. Know the three elements of a map.

2. Know the representation method of scale bar on the map, the conversion and calculation of scale bar.

3. Know the three representation methods of direction and be able to identify different directions on the map.

4. Familiarize yourself with and memorize the important legends on the map.

A map is an image that uses various symbols to reduce things on the ground to a certain proportion and then displays them on a flat surface.

2·What is scale? What is the formula?

Scale bar: Indicates the degree to which the distance on the map is smaller than the actual distance.

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.

1. In which direction is the Giraffe Hall located to the Elephant Hall?

2. The distance on the picture is 1 cm, the scale is 1:200000, find the actual distance.

A person stands on the South Pole. What are the directions to his front, back, left and right?

What if you were standing on the North Pole?

When traveling or investigating in the field, if you get lost and don’t have a compass, how can you determine the direction in the northern hemisphere?

1. If you have a detailed map with you, you should first look up the legend to see what each symbol represents and find out where on the map you are standing. Find on the map where you were before you got lost, and then recall the houses, streams, or other geographical features you passed.

2. If you can't find reliable geographical features, you can use the sun to tell the direction. At noon, the Sun in the Northern Hemisphere is at the zenith to the south.

3. If the clouds are thick and the sun is not visible, you can tell the direction by looking at the moss on tree trunks or rocks. Moss usually grows in backlit areas. In the northern hemisphere, there is more moss on the north or northeast side, and the south side is where the leaves grow densely.

4． The direction can be identified based on the ants' burrows. Because most of the ant holes face south.

5. If it's a starry night, you can identify the direction by the stars: in the northern hemisphere, the Big Dipper helps find Polaris, which is due north.

6． If it is winter, the part of the snow that is difficult to melt is always facing north due to sunlight.

After what you just learned, what methods do you think you can use 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.

The development of maps

With the application of modern means such as electronic computers, map information is obtained and presented in increasingly diverse ways, which greatly facilitates our selection and use of maps. For example, using satellites or aircraft, ground information can be quickly obtained over a large area and processed into recognizable images, which can be printed on paper or directly displayed on a screen.

Practice in class:

1. The basic elements of a map are: ______, ______, ______. The scale bar represents the degree of reduction compared to ______ distance on the map. The formula for a scale is ______.

2. On a map, when there is neither a beacon nor a latitude and longitude grid, it is usually "up, north, down______, left, west, right______". On this basis, the northeast, ______, southeast and Southwest direction. On a map without a latitude and longitude grid, the direction must be determined based on the latitude and longitude lines. Longitude lines indicate the ______ direction, and latitude lines indicate the ______ direction.

3. The smallest of the following scales is: ( )

A. 1:500 B. 1:4000

C. 1:3000 D. 1:600

4. On a map with a scale of 1:500000, the straight-line distance between place A and place B is measured to be 4 cm, and the actual distance between the two places is: ()

A. 2 kilometers B. 0.2 kilometers

C. 20 kilometers D. 4 kilometers

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For more information about the "Earth and Maps Map Reading" PPT courseware, please click the "Earth and Maps ppt Map Reading ppt" tag.

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Update Time: 2024-11-24

This template belongs to Geography courseware People's Education Edition Geography for Grade 7 Volume 1 industry PPT template

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