What is Contour? What does contour line mean

A contour line is a closed curve of points of equal elevation on a topographic map.

A closed curve that connects points on the ground at the same altitude. Projecting vertically onto a standard surface and drawing on the drawing in scale to obtain a contour line. Contour lines can also be seen as the intersection of horizontal planes at different altitudes with the actual ground, so contour lines are closed curves.

The characteristics of contour lines are: (1) Ground points located on the same contour line at the same altitude. (2) In the same image, contour lines of different elevations cannot intersect except for cliffs.

The height difference of adjacent contour lines in the contour is generally the same, so the ground slope is inversely proportional to the horizontal distance between the contour lines, and the smaller the horizontal distance of the adjacent contour lines, the denser the contour line arrangement, the greater the ground slope. The greater the horizontal distance between adjacent contour lines, the sparser the contour line arrangement, the smaller the ground slope. Therefore, the contour line can reflect the undulating situation of the surface and the characteristics of the surface morphology.

In a specific area, a geographical location connection line drawn based on a certain altitude;

Contour lines can visually reflect the topographical features of an area, for example, if the contour lines are close to one side or directly tangent for many consecutive circles, the place is a steep slope or cliff.

For a mountain, contour lines are the same altitude and are graphically identified, that is, lines are used to connect altitudes of equal height, which is generally a closed curve.

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This is the professional knowledge of geography, which you will learn in high school.

Contour lines can be simply said to be connecting points with the same altitude with lines, and all lines must be the same distance!

A contour line is a closed curve of adjacent points of equal elevation on a topographic map.

About contour lines:

1. Contour line refers to the closed curve formed by adjacent points with equal elevation on the topographic map. Contour lines can also be seen as the intersection of horizontal planes at different altitudes with the actual ground.

2. Contour lines can be divided into four types according to their functions: the calculation curve, the first curve, the auxiliary curve and the intermediate curve.

3. The method of obtaining contour data: the closed curve formed by connecting the points with the same altitude on the ground, and projecting it vertically onto a horizontal plane, and miniaturizing it on the drawing in proportion, so that the contour line can be obtained. Note:

The numbers marked on the contour line are the elevation of the contour line.

4. List the characteristics of contour lines:

1) In the same image, contour lines of different elevations cannot intersect except for steep cliffs.

2) A contour line is a closed curve, if it cannot be closed in the same frame, it must be closed in an adjacent or other frame.

3) Ground points located on the same contour line at the same altitude. But points with the same altitude are not necessarily on the same contour line.