How to see the climate on contour topographic map?

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Number? (1) characteristics.

summary

Read the value as a small height, and compare the two temperature differences to convert them into two heights.

horizontal distance

Measure the distance from the actual ground.

(2) Morphological features: the surface presents various forms, and each form has some external features of the terrain on the contour map, which will be reflected in different forms. Look at the density curve, the slope is known. The topography of the contour shape can be determined.

Second, to master contour lines, the key is to know the basic knowledge of contour maps.

(1) The contour point of the contour line with the same contour line, and the sea level is taken as zero meter. The height of two adjacent contour lines.

Integration level

It is the same.

(2) The interval time of contour lines refers to the same height difference between two adjacent contour lines. Take 500 meters, 600 meters and 700 meters as examples, and there are three elevation contours with a distance of 100 meters.

(3) Contour closed curve, no matter how many twists and turns, will eventually be surrounded by a circle on the map, but not necessarily all closed.

(4) Two contour lines never intersect, because in general, there will be no two heights at the same position. But on a vertical cliff, the shapes can overlap.

⑤ The density profile reflects the sparse density of the profile on the gentle steep slope, and the steep slope is the place where the slope is evenly expressed at equal intervals. while

⑥ contour valley sum

ridge line

Or both sides of a shape in which a ridgeline perpendicular to a contour line passing through the ridgeline is substantially parallel. When crossing the outline of the valley (valley

Catchment line

Or line), and the upstream is bent into an inverted V-shape. When two mutually symmetrical convex surfaces

⑦ The outline is a saddle, also known as a mountain pass.

⑧ The slope line indicates the downward slope of the slope line and the contour line is perpendicular to the short term, always pointing in the direction of lower height, sometimes called the downward slope line.

Pet-name ruby some special contour lines, 0 meters said sea level, is the coastline;

200 meters to distinguish between plains and low hills;

500 meters, 1000 meters shows low mountains or plateaus;

2000 meters, 3000 meters reflects Zhongshan and the plateau;

4000 meters embodies the characteristics of the mountains of the Qinghai-Tibet Plateau.

Third, determine the coils with high basic landform skills.

sequence

Four-pronged comprehensive strategy

Interpretation of contour map and its application lessons.

① Determine the location of reservoirs and dams: reservoirs should be selected in valleys, river valleys or "pocket-shaped" depressions or small basins. The storage capacity of these areas is not only large, but also large.

catchment district

② Determined railway and highway routes: In general, use

Superior position

, choose curves and straight lines with slower slopes, shorter distances and fewer numbers, and.

③

Facility site selection

The site selection is determined from all aspects: the factories and mines that pollute the environment should be selected in the lower reaches of the river, which is lower than normal.

predominant wind direction

, combined with geological and topographic conditions, should be placed on a solid foundation.

Contour spacing

A large flat and open place; If in electronics, semiconductors and other fields

photographic equipment

The factory is built in a place with fresh air and beautiful environment. From an economic point of view, we should be as close as possible to the origin of resource pools such as raw materials and fuels, convenient transportation conditions and sales markets, so as to determine the layout of industrial departments. agricultural production

④ According to the types of contour topographic maps, reflect the mining, undulating terrain, steep slopes, etc., increase climate and pool conditions, adjust measures to local conditions, and rationally arrange agriculture, forestry, animal husbandry and fishery projects. Terrain related to geographical knowledge

⑤ Analysis: The analysis of local climate characteristics should be related to local geographical latitude, rugged terrain, mountainous areas, rain or shine, comprehensive distance analysis, and combination from the sea. The upper reaches of the river are high-altitude areas and the lower reaches are low-altitude areas. Combined with the judgment of river topography trend, windward slope, leeward slope, rainfall condition, contour line and variance, the river hydrology and water function landform are analyzed.