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Soil erosion surface form DEM construction and observation method and device in rainfall process

A soil erosion and surface morphology technology, applied in the field of soil erosion surface morphology DEM construction and observation, can solve problems such as inability to model three-dimensional cushion surface, difficult to deal with rain and fog, etc., to achieve real-time observation, improve accuracy and efficiency.

Active Publication Date: 2019-10-22
NORTHWEST A & F UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method and device for constructing and observing soil erosion surface form DEM in the rainfall process, so as to solve the problem in the prior art that it is difficult to process the rain and fog in the collected images by using the three-dimensional modeling method in the rainfall process , it is impossible to realize the problem of 3D modeling of soil erosion underlying surface under continuous rainfall conditions

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  • Soil erosion surface form DEM construction and observation method and device in rainfall process
  • Soil erosion surface form DEM construction and observation method and device in rainfall process
  • Soil erosion surface form DEM construction and observation method and device in rainfall process

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Embodiment 1

[0058] This embodiment discloses a method for constructing a DEM of soil erosion surface morphology during rainfall, which is used to obtain a DEM of the soil erosion underlying surface in a rainfall environment.

[0059] Follow the steps below:

[0060] Step 1. Set N cameras directly above the soil erosion underlying surface to be modeled, where N is an integer greater than 1, and use each camera to simultaneously collect multiple images of the soil erosion underlying surface to be modeled. image, obtain N initial image groups, and each initial image in the initial image group has the same size;

[0061] In this embodiment, several groups of digital image collectors are networked based on wireless network technology, and each group of digital image collectors includes a digital camera and an industrial control level computer. The number of digital image collectors depends on the size and shape of the underlying surface area and the erection height of the digital image collec...

Embodiment 2

[0085] A method for observing surface morphology of soil erosion during rainfall, which is used to obtain the amount of soil erosion between adjacent observation moments during rainfall, is performed according to the following steps:

[0086] Step A, collect the DEM of the underlying surface of soil erosion to be observed before the rainfall, and use the model as a benchmark for calculating the amount of erosion;

[0087] In this step, the construction of the datum reference plane is completed, the 3D point cloud data and digital elevation model without erosion are obtained, and the 3D point cloud data and digital elevation model are used as the datum reference plane for the shape change of the underlying surface after erosion occurs.

[0088] Step B, using the DEM construction method of soil erosion surface form in the rainfall process described in any one of claims 1-2 to obtain the DEM of the soil erosion underlying surface at multiple observation moments in the rainfall pro...

Embodiment 3

[0094] In this example, an experiment was conducted on the effectiveness of the model construction and erosion observation method provided by the present invention. The experiment was carried out on October 4, 2018 in the artificially simulated rainfall hall of the State Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau.

[0095] The experiment was set up with two left and right parallel steel channels and was carried out on the morning and afternoon of October 4, 2018 respectively. In the experiment, the intensity of artificially simulated rainfall is 90mm / h and 120mm / h respectively, and the constructed underlying surface is as follows: figure 1 , 2 , as shown in 3, where figure 1 with figure 2 The pictures of the underlying surfaces of the left and right soil grooves without erosion (taken before the rainfall), respectively, image 3 These are pictures of the underlying surfaces of the left and right soil tanks where erosion occurred (taken afte...

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Abstract

The invention discloses a soil erosion surface form DEM construction and observation method and device in a rainfall process, and the method comprises the steps: processing a gray value pixel by pixelthrough employing a K-means algorithm, reconstructing a pixel value after rain and fog removal from a plurality of pixel values, and improving the rain and fog removal accuracy and efficiency of an image. The underlying surface form can be observed in the continuous rainfall process, and the soil erosion occurrence and development process is digitally and graphically expressed. More importantly,the underlying surface form is described from two dimensions of time and space at the same time, and a powerful means is provided for scientific research of the soil erosion process and mechanism.

Description

technical field [0001] The invention relates to a soil erosion form evolution observation method, in particular to a soil erosion surface form DEM construction, observation method and device in a rainfall process. Background technique [0002] The digital elevation model (DEM) realizes the digital simulation of the ground terrain through the limited terrain elevation data (that is, the digital expression of the terrain surface shape), and it is a solid ground model that expresses the ground elevation in the form of a set of ordered numerical arrays. In the prior art, the method of constructing DEM of soil erosion surface morphology is mainly digital close-range photogrammetry, which is a non-contact measurement method to facilitate modeling of soil morphology. Although digital close-range photogrammetry technology reaches the centimeter or even millimeter level However, due to the difficulty in processing the raindrops in the collected images in the 3D modeling method during...

Claims

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Application Information

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IPC IPC(8): G06T17/20G06K9/62
CPCG06T17/20G06F18/23213
Inventor 史海静赵军展小云税军峰曹晓萍姜艳敏刘一新林奇郭明航
Owner NORTHWEST A & F UNIV
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