How to measure the rural land area?

So far, the methods of obtaining data from rural surveying and mapping are:

1. In engineering survey, topographic map is made by field survey.

2. Traditional manned aerial survey and mapping topographic map.

3. Using UAV aerial photogrammetry technology to obtain topographic map data of the test area (new).

The first method: field measurement. This method can't provide the image base map, and the field survey needs a large number of field surveyors, so the cost is high, and the specific implementation will be greatly affected by the terrain and climate, so it is difficult to meet the construction period and quality requirements.

The second method: traditional manned aerial survey. The traditional manned aerial survey needs a series of work, such as airspace application and coordination with the airport, which is costly and cumbersome to operate.

The third method: UAV aerial photogrammetry. Compared with the other two measurement methods, UAV aerial photography has the advantages of low cost, convenient execution, high degree of automation, high precision and high efficiency.

Extended data:

calculate

When the land area is small and irregular, it is divided into several triangles, and the area of each connected triangle is calculated by Hailong formula, and then added.

The accurate measurement of a large area of land is divided into small areas, measured block by block, and then added up.

The rough survey of large-scale land is to draw a map first and then measure it on the map.

Measurement methods on drawings:

Cut the area to be measured on the map according to the boundary and weigh it with a balance with high accuracy (such as 0.0 1g), then cut the edge part cut on the same map into a rectangle with regular area, calculate the area and weigh it. According to the area weight: area = edgepartweight: edgepartarea, the area of this area on the map can be calculated and multiplied by the scale.

If there is no balance with higher precision, you can also stick the whole picture on a rubber plate with uniform thickness, weigh it with a scale and calculate it in the same way as above.

Land area ranking

1, Russia (about 17075200 square kilometers).

2. Canada (about 9.976 million square kilometers).

3. China (about 9.609 million square kilometers).

4. The United States (about 9.3269 million square kilometers).

5. Brazil (about 85 1. 1.9 million square kilometers).

6. Australia (about 7,686,800 square kilometers).

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