Interpretation of contour lines 15, interpretation of contour lines

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.

Characteristics of contour topographic maps.

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

2.Two contour lines on the same image do not intersect (except for cliffs)3Contour lines are generally closed curves, but they can not be closed in local plots.

4.The greater the curvature of the contour line, the greater the gradient of change on both sides of the contour line.

5.The denser the contour line, the steeper the terrain; The sparser the isobar, the slower the terrain.

1) Peak: It can also be called a peak, a mountain range. In the contour topographic map, if the contour line value is high in the middle and low in the periphery, the middle is a mountain range.

2) Ridge: In the contour topographic map, the contour line bends from high to low.

3) Valley: In the contour topographic map, the contour line bends from low to high.

4) Basin: In the contour topographic map, if the contour value is low in the middle and high in the periphery, the central part is a basin.

5) Saddle: A contour topographic map that is relatively low between two adjacent ridges.

6) Cliff: The place where the contour lines intersect in the contour topographic map.

7) Steep slope and gentle slope: In the same contour topographic map, the contour line is dense and the slope is steep; The sparse contour line is a gentle slope. In topographic maps of different contours, it should be determined according to the scale bar.

8).Where contour lines are dense, indicating steep slopes;

9).Where the contour line is sparse, it indicates a gentle slope;

10).The interval between contour lines is uniform, which means that the slope up and down is uniform, and it is a uniform slope;

11).From bottom to top, the contour line is dense and sparse, indicating that the lower slope of the mountain is steeper, and the upper slope of the mountain is gradually gentle, which is a convex slope;

12).From bottom to top, the contour line is sparse and dense, indicating that the lower slope of the mountain is gentle, and the upper slope of the mountain is steep, which is a concave slope.

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

2.Two contour lines on the same image do not intersect (except for cliffs)3Contour lines are generally closed curves, but they can not be closed in local plots5The denser the contour line, the steeper the terrain; The sparser the isobar, the slower the terrain.

Let's go out and observe nature, and over time, you will react when you look at the picture.

The interpretation of the contour line is as follows:

The height of the fingers on the contour map is the altitude, not the relative altitude, and the altitude on the same contour line is the same.

In the same contour topographic map, all contour distances are equal. (Contour distance refers to the height difference between two adjacent contour lines).

Contour lines are all closed curves, and some are not closed curves because the image is small and cannot be presented in one picture. Contour lines generally do not overlap and do not cross. If there is an overlap, it means that the place is a steep cliff.

The density of the contour line reflects the steepness of the slope. The contour line is sparse and the slope is gentle; Contour lines are dense and steep slopes.

A contour line is a closed curve of adjacent points of equal height 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. The contour line can also be regarded as the intersection line between the number of circles in the horizontal plane at different altitudes and the actual ground, so the contour line is a closed curve.

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

Altitude (absolute height): The vertical distance above sea level at a point on the ground, starting from sea level; Relative height: the vertical distance by which one point is higher than another; Contour topographic map:

A map that uses contour lines to represent the actual height of the ground in an area and the ups and downs.

The concept of contour lines is as follows:

1. Contour line refers to the set of continuous points on the same curve presented on the map as each point on the same horizontal plane. These points are the same in elevation, and the curve formed is called a contour line.

2. On the earth's surface, each point has a specific altitude, which is the altitude. Contour lines connect points of the same height to connect several celeries, which can more intuitively show the characteristics and changes of the terrain on the map.

1. How to draw a contour map

1. A common contour map is to connect points of the same elevation into a line by measuring elevation data on the actual terrain. The spacing and line width of the contour lines can be adjusted as needed.

2. The denser the contour line, the greater the change of terrain undulation; The sparser the contour line, the more gentle the topographic changes will be. There are now many digital earth models and satellite remote sensing imagery technologies that can produce more accurate, three-dimensional and comprehensive contour maps.

2. The application of contour lines in map making and topographic analysis.

1. Contour lines can be used not only for terrain analysis, but also for aviation, navigation and map making. Contour lines also play an important role in the study of meteorology, environmental protection and other fields.

2. Through the analysis of contour lines, people can understand the ground landform (mountain peaks, ridges, rivers, steep slopes, etc.), judge the soil type, estimate the potential of energy resources, etc.

3. With the development of GIS (Geographic Information System) technology, contour lines are also widely used in digital earth models, virtual earths, GIS platforms, remote sensing and other fields, and more and more new fields and applications have been stimulated.

3. Characteristics of contour lines

1. 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. (As shown in the contour line of 140m in the figure on the right). In the same image, contours of different elevations cannot intersect except for steep cliffs.

2. 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, the denser the contour line arrangement, the greater the ground slope; The larger the contour line spacing and the sparser the contour line arrangement, the smaller the ground slope.

3. The contour line is a closed curve, if it cannot be closed in the same frame, it must be closed in the adjacent or other sheets. The contour line changes direction as it passes through a ridge or valley, so the ridgeline or valley line should be perpendicular to the tangent at the turning point of the contour line, i.e., the contour line is orthogonal to the ridge line or valley line.

Contour lines are defined as closed lines formed by points of the same elevation on a topographic map. It is used to indicate the height of the terrain.

Contour lines are defined as closed lines formed by points of the same elevation on a topographic map. It is used to indicate the height of the terrain.

The phonetic pronunciation is: 一 . The pinyin is:

děnggāoxiàn。The structure is: equal (upper and lower structure) high (upper, middle and lower structure) line (left and right structure).

What is the specific interpretation of contour lines, we will introduce you through the following aspects:

The idiom about contours is great.

Wait for the three of the idle view, the nine grids, the same meter, the pot, the lead, the needle, the writings, the same body, the needle, the first line, the same height, the first and so on, the etiquette, and so on.

Words about contours.

Threads, threads, needles, writings, etc., dressed as equal bodies, equal manners, etc., such as casual eyes, the third class, nine grids, etc., because of this three, six, nine, and other superior people, and the first class of idle people.

Guan Shuzai calls the sentence formation of the contour line.

1. Now, take a little bit on the contour chart.

2. The main content involves the implementation method and steps of extracting contour lines from paper map scanned images, as well as the scheme design and algorithm implementation of spline surface interpolation based on contour lines.

3. In the three-dimensional fluorescence contour spectrogram of aqueous solution, Rayleigh scattering rays and fluorescence contours partially intersect.

4. A contour plot showing the temporal variation between two in-phase axes or reflective layers.

5. Contour lines are used to describe the structural form with equal spacing**.

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