"Interpretation of Topographic Maps" Earth and Map PPT Courseware

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"Interpretation of Topographic Maps" Earth and Map PPT Courseware

The first step is to measure the height of the ground

why? Could it be that the measurement was wrong?

The vertical distance a point on the ground is above sea level is called elevation.

The vertical distance between one location and another location is called relative height.

The second level is the drawing of contour lines and contour distances.

Contour lines: The lines connecting points with equal elevations on a map are called contour lines.

1. The picture below shows the measured altitude of a certain place. Read the picture to complete the next question.

The general direction of the terrain in the picture is ( )

A. something b. north and south

C． Northeast-Southwest D. Northwest to Southeast

What is contour distance?

Contour distance: The height difference between two adjacent contour lines on a topographic map. The size of the contour intervals depends on the size of the map scale.

1. The contour distance in the picture is _______ meters.

2. If B is on the contour line, then the altitude of B is _______ meters.

3. If M and N are both on the contour line, the relative height of M and N is _______ meters.

The third level has a steep and gentle slope

How to distinguish between gentle slope and steep slope?

The contours are sparse and the slope is gentle.

Contour lines are intensive and the slope is steep

Contour line features:

is a closed curve.

All elevations on the same contour line are the same.

The denser the contours, the steeper the slope; the sparser the contours, the gentler the slope.

Contour lines generally do not intersect or overlap (except at cliffs).

Review of knowledge points:

Ridge - Contour lines bulging downwards

Valley - Contour lines bulge upwards

Saddle - between two mountain tops and, of course, directly opposite the tops of two valleys

Escarpment - Contour lines overlap at a scarp (i.e. highly dense)

The top of the mountain - the contour lines are in the shape of concentric circles, with the inside being higher and the outside being lower.

Basin - Contour lines are concentric circles, low inside and high outside

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"Interpretation of Topographic Maps" PPT download:

"Interpretation of Topographic Maps" PPT Download Part One: New Lesson Knowledge 1. Introduction of New Lessons Xiao Ming competed with TOM to climb Mount Tai. The smart TOM quickly climbed to the top of the mountain with the help of a map. Does anyone know what map it is? They faced Mount Tai from the foot of the mountain to the top...

"Interpretation of Topographic Maps" PPT courseware:

"Interpretation of Topographic Maps" PPT courseware Part 1: Learning objectives 1. What is the definition and calculation of altitude and relative altitude? 2. What is the definition of terrain? What are the five common types of terrain and their characteristics? 3. Identify the slope size and cliffs, peaks, saddles, mountains...

"Interpretation of Topographic Maps" PPT:

"Interpretation of Topographic Maps" PPT Part One Content: New Lesson Learning The vertical distance between a certain point and another point is called the relative height. The vertical distance between a certain point and the sea level is called the absolute height, which is the various ups and downs of the altitude surface. Collectively called terrain. Five kinds of ground...

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Update Time: 2024-10-21

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

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