Contour judgment!! Geography Contour!!

The first question, the saddle, mainly depends on the shape, do you know what the saddle looks like? That's it... Saddle-like · · The middle part is the saddle... Understand?

The second and third ... Ridges. Look at where the contour line protrudes, but also look at the height value next to it, that is, to see if the number next to it is increasing up or down...

If the contour line protrudes upwards and the abrupt value increases, that is the ridge. And then if the contour line protrudes downward, it's a valley!

Well, for the second and third questions, there is a simple way, which is that you draw a horizontal line, across the contour line... Then you see if the value in the middle is greater or the value of the two heads is larger, and if the value in the middle is greater than the value on both sides, it is a ridge (you can think of that shape... If the value in the middle is less than the value at both ends, then this is the valley... Got it?

If the protruding contour line is growing, then it is a valley, and vice versa is a ridge, and as for the saddle, the place between the two mountains is the saddle.

The small circle of the concave land on the top of the mountain, the difference depends on the slope line;

The top of the mountain is pointed outward, and the depression is pointed inward.

The ridge curve is convex outward, and the valley curve is curved inward;

The ridge convex ridge waterline, the valley concave bottom waterline

The two mountains are connected and called the saddle, and the high and low two groups of contour lines;

The mountains are connected at the highest point, and the ridgeline is called the ridgeline.

Terrain undulation determination:

Observe the general geomorphology and identify the heights of each place;

Distinguish between uphill and downhill, and number annotation along the line.

Personally, I think that to judge this contour line, you only need to associate it with the actual mountain, from the sky, and reflect each point on the plane to form, such as the contour line of the valley is bent upward, and the value of the contour line is constantly increasing.

Contours are closed curves that do not intersect each other, and can coincide at cliff contours.

The ridge is a bulge... The valley is a depression. How easy it is. How can it be so complicated? You get one to understand. I'll understand it later.

3 If the cliff m is directly south of Village A, then it can be seen that the general direction of the river next to Village B is: a from northwest to southeast.

It is only necessary to connect a straight line between the cliff m and village A, the direction of cliff m is south, and the direction of village A is north; Then draw the direction map parallel to the river next to Village B (as shown in the figure), and it can be seen from the high line in the figure that the river next to Village B flows from the top (northwest) to the bottom (southeast). A right.

Hello, the answer is A, here is the process of solving the problem.

First of all, we need to judge the height of the terrain from the contour line, and if you look at the map, there are two contour lines on the left side of Otomura, the upper one is 100 and the lower one is 50, so you can see that the upper terrain is higher than the lower one, so you can infer that the river flows from the top down.

The second is to judge the direction of the river, according to the hint M is directly south of Jiacun, and then according to the "up to the north, down to the south, left to the west, right to east", it is concluded that the north of the map is facing the upper right, the west is facing the upper left, the south is facing the lower left, and the east is facing the lower right, and the river flows from the top to the bottom, that is, from the northwest to the southeast.

Hope it helps.

From the steep cliff m to the south of village A, the azimuth coordinates of village A can be obtained, and then moved to village B, and the river of village B can flow to the southeast. Choose A

According to the up, north, down, south, left, west, right, east, you can exclude b and d first, and according to the direction of the river on the map, you can determine that the flow direction of the river is to the southeast, so choose a