An importance analysis method of soil erosion influencing factors based on stochastic forest

A technology of soil erosion and influencing factors, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of lack of importance definition standards for soil erosion influencing factors

Active Publication Date: 2018-12-18
FUZHOU UNIV
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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to propose a random forest-based soil erosion impact factor...

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  • An importance analysis method of soil erosion influencing factors based on stochastic forest
  • An importance analysis method of soil erosion influencing factors based on stochastic forest
  • An importance analysis method of soil erosion influencing factors based on stochastic forest

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[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0048]It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0049] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinat...

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Abstract

The invention relates to an importance analysis method of soil erosion influence factors based on random forest. Firstly, the soil erosion grade situation and corresponding attributes of the researcharea are obtained, and then the obtained data are randomly sampled by equal amount according to different erosion grades. Then, taking the sampled points as the analysis data set, the optimal parameters of two stochastic forest models, mtry and ntree, which represent the number of nodes randomly sampled when building decision tree branches, are determined by the method of ergodic comparison. Then,based on the optimal parameter solution, the optimal stochastic forest model was constructed, and two indexes to measure the importance of variable factors were calculated by using the out-of-bag data. Finally, the importance of each variable factor is determined by reordering the mean precision reduction value MDA and mean impurity reduction value MDG. The invention solves the problem that the soil erosion influence factor lacks the importance defining standard.

Description

technical field [0001] The invention relates to the field of soil erosion research, in particular to a method for analyzing the importance of factors affecting soil erosion based on random forests. Background technique [0002] Soil erosion is the concentrated expression of ecological deterioration, which not only leads to land degradation, but also exacerbates problems such as flood disasters. The occurrence of soil erosion is the result of multiple factors such as topography, natural climate and human activities. Most of the existing technologies stay in the research on the influence of a single factor on soil and water loss, and there are few studies on the comprehensive factors that affect soil and water loss. At present, the important analysis of factors affecting soil erosion is through t-test and partial correlation coefficient. This method has disadvantages such as relatively single angle, small sample size and high requirement for feature independence. [0003] Ra...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 汪小钦陈妙金陈芸芝吴思颖
Owner FUZHOU UNIV
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