What is a contour line and what are its characteristics

Contour. According to its different functions, it is divided into four types: the first curve, the counting curve, the intermediate curve and the auxiliary curve.

1) The first curve, also known as the basic contour line, is a thin solid line surveyed and mapped according to the prescribed contour distance to show the basic form of the landform.

2) Counting curves, also known as bold contour lines, from the specified elevation starting surface, the first curve is thickened into a thick solid line every 4 contour distances, so as to interpret and calculate the elevation on the map.

3) The inter-distance curve, also known as the half-distance contour line, is a slender dashed line depicted by one-half contour distance, which is mainly used to show a certain section of miniature landform that cannot be displayed by the first curve.

4) Auxiliary curves, also known as auxiliary contour lines, are thin and short dashed lines depicted at a quarter of an equal distance to show a certain section of miniature landform that cannot be displayed by the inter-curve.

The inter-curve and the auxiliary curve are only used to show the landform of the local area, so they are generally not closed except for the top of the mountain and the depression that are closed separately. There is also a kind of ** slope line that is orthogonal to the contour line and indicates the direction of the slope, and one end connected to the contour line points to the uphill direction and the other end points to the downhill direction.

Characteristic. 1) The elevation of any point on the same contour line is equal.

2) The height difference between adjacent contour lines is equal. The amount of horizontal spacing of contour lines indicates how gentle or steep the terrain is.

3) Contour lines are continuous, closed curves.

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

5) Contour lines cannot cross the river valley embankments and roads on the drawings.

6) The direction of the water flow is perpendicular to the contour line.

Slope shape is determined. 1) The elevation of points on the same contour line is equal;

2) The contour line is a closed curve, which is closed outside the figure if it is not closed in the figure, so it cannot be interrupted in the figure except for the symbols of features such as houses, roads, and rivers;

3) Except for special landforms such as cliffs, contour lines cannot intersect;

4) Under the condition that the contour distance is the same, the denser the contour line, that is, the smaller the contour line distance, the steeper the ground slope, on the contrary, the thinner the contour line, that is, the larger the contour line level, the slower the ground slope;

5) Contour lines should intersect vertically when they meet ridge lines or valley lines and change direction.

Here are the specific features:1. Including on the same contour line, the height of any point is equal;

2. The height difference between adjacent high lines is also the same;

3. The horizontal spacing of the contour line can indicate the steepness or gentleness of the terrain;

4. Contour lines are closed or continuous curves, and contour lines generally do not overlap or intersect.

A contour line is a closed curve of adjacent points of equal elevation on a topographic map. Contour lines are obtained by connecting closed curves of points at the same altitude on the ground, projecting them vertically onto a horizontal plane, and miniaturizing them on the drawing in proportion. 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 numbers marked on the contour line are the elevation of the contour line.

1. The altitude of the ground points located on the same contour line is the same. However, points with the same altitude are not necessarily located on the same contour line.

2. In the same picture, contour lines of different elevations cannot intersect except for cliffs.

3. The height difference of adjacent contour lines in the contour outline is generally the same, so the ground slope is inversely proportional to the contour line level distance between the contour lines, the smaller the contour line level distance, the denser the contour line arrangement, the greater the ground slope; On the contrary, the larger the contour line distance and the sparser the contour line arrangement, the smaller the ground slope.

4. The contour line is a closed curve, if it cannot be closed in the same frame, it will definitely close in the adjacent or other frames.

Notes:

There are many characteristics of contour lines, and these knowledge points are generally exposed to when they are in school, such as the same contour line, any point is equal in height. In addition, the height difference between adjacent high lines is also the same, and the horizontal spacing of the contour lines can indicate the steepness or gentleness of the terrain. In addition, contour lines are closed or continuous curves, contour lines generally do not overlap or intersect, and contour lines cannot cross any roads and valley embankments on the drawing.

This is also a necessary knowledge in life, whether it is life or work, this knowledge point is needed.

The properties of contours include that on the same contour line, the height of any point is equal; The difference in height between adjacent high lines is also the same; The horizontal spacing of the contour lines can indicate the steepness or gentleness of the terrain; Contours are closed or continuous curves, and contour lines generally do not overlap or intersect.

1) The elevation of any point on the same contour line is equal.

2) The height difference between adjacent contour lines is equal. The amount of horizontal spacing of contour lines indicates how gentle or steep the terrain is.

3) Contour lines are continuous, closed curves.

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

5) Contour lines cannot cross the river valley embankments and roads on the drawings.

Explain the concept and characteristics of contour lines.

Contour line: is a closed curve of adjacent points of equal elevation on the ground.

Contour Characteristics:

1) The elevations of points on the same contour line are equal;

2) Contours are closed curves;

3) Contour lines of different elevations cannot intersect;

4) The contour line is orthogonal to the ridge line and the valley line;

5) The vertical distance between two contour lines is called the horizontal distance, and the size of the horizontal distance between the contour lines is inversely proportional to the size of the ground slope.

Contour. The characteristics are:

1.The elevations of points on the same contour line are equal;

2.The contour line is a closed curve, if it is not closed in this view sheet, it must be closed outside the view;

3.Except at cliffs or cliffs, contour lines cannot intersect or coincide on the diagram;

4.The horizontal distance of the contour line is small, indicating that the slope is steep, and the horizontal distance is large, indicating that the slope is gentle;

5.The contour line is orthogonal to the ridge line and the valley line.

The characteristics of contour lines include:

On the same contour, the height of any point is equal;

The difference in height between adjacent high lines is also the same;

The horizontal spacing of the contour lines can indicate the steepness or gentleness of the terrain;

Contours are closed or continuous curves;

Contour lines generally do not overlap or intersect.

1) On the same contour line, the elevation of any point is equal.

2) The difference between the adjacent contours is almost equal. The amount of horizontal spacing of contour lines indicates how gentle or steep the terrain is.

3) Contour lines are continuous, closed curves.

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

5) Contour lines cannot cross the river valley embankments and roads on the drawings.