"Interpretation of Topographic Maps" PPT

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"Interpretation of Topographic Maps" PPT

Part One Content: New Lesson Learning

The vertical distance between a location and another location is called relative height

The vertical distance of a point above sea level is called absolute height, that is, altitude

The various ups and downs on the earth's surface are collectively called terrain.

Identification of five types of terrain

Plain: Relatively flat terrain below 200 meters above sea level

plateau

The altitude is higher.

Characteristics: The ground is flat or has little undulations, and the edges are steep.

Mountain

The altitude is relatively high, generally above 500 meters.

Features: undulating peaks and steep slopes.

Part 2 content: Characteristics of contour lines:

1. Contour lines are closed curves.

2. All points on the same contour line have the same altitude.

3. Large value - high altitude

Small value - low altitude

4. Dense distribution - steep slope

Sparse distribution - gentle slope

Summit—The highest part of a mountain, where the contour values ​​are greatest.

It is a closed curve, and the center value of the contour line is high. low all around

Ridge - The top of a mountain ridge, extending in a linear shape. Similar to the ridge of a house or the backbone of a horse's back.

The curved portion of the contour lines bulges downward (in the direction of smaller contour values).

Valley - A low-lying portion between ridges that extends in a linear pattern.

The curved part of the contour line bulges upward (in the direction of the larger contour value).

Saddle - The relatively low part between two adjacent mountain tops.

The middle section consists of a pair of contour lines.

Part Three: Knowledge Application

How to interpret mountains based on contour topographic maps

1. Read the value of each contour line

2. Determine the height and fluctuation of the ground based on numerical changes

3. Determine whether the slope is steep or gentle based on the density of contour lines.

4. Determine ridges and valleys based on the curvature of contour lines

How to use contour lines to determine terrain locations?

The value on the top of the mountain is high on the inside and low on the outside, forming a closed shape.

saddle between two mountain tops

steep cliff overlapping contours

Ridge Contour lines protrude from high to low

Valley contour lines protrude from low to high

Part 4 content: Classroom exercises

1. Which of the following descriptions of the five basic land topographic features is correct ( )

A. If the ground is broad and flat, it must be a plain.

B． The rolling ground must be mountainous

C． The plateau is relatively high, but the altitude is low

D． A basin is a terrain that is high on all sides and low in the middle.

2. The picture below is a schematic diagram of four contour terrains. The one that reflects the artistic conception of "an ancient temple hidden in the mountains" is ( )

3. The altitude of the top of the mountain in the picture may be ( )

A. 457 meters B． 400 meters C. 531 meters D. 398 meters

4． The terrain represented by the dotted line in the figure is ( )

A. Valley B. Saddle C. Mountain top D. ridge

5. The location with the serial number in the figure has the smallest slope ( )

A. ① B. ②C． ③D. ④

Keywords: Business Planet version seventh grade geography PPT courseware free download, topographic map interpretation PPT download, .PPT format;

For more information about the "Interpretation of Topographic Maps" PPT courseware, please click the Interpretation of Topographic Maps ppt tab.

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Update Time: 2024-10-02

This template belongs to Geography courseware Business Planet Edition 7th Grade Geography Volume 1 industry PPT template

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