Soil organic carbon predication method based on geographically weighted regression

A technique of geographical weighting and regression method, applied in soil material testing, material inspection products, etc.

Active Publication Date: 2015-07-08
INST OF SOIL SCI CHINESE ACAD OF SCI
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Problems solved by technology

[0009] In view of the above-mentioned technical problems, the technical problem to be solved by the present invention is to provide a method covering two key technical links of local regression multicollinearity diagnosis technology and multicoll

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  • Soil organic carbon predication method based on geographically weighted regression
  • Soil organic carbon predication method based on geographically weighted regression
  • Soil organic carbon predication method based on geographically weighted regression

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Embodiment Construction

[0070]The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0071] The basic idea of ​​designing the soil organic carbon prediction method based on geographically weighted regression in the present invention is to complete the diagnosis and treatment of the collinearity problem between independent variable sets in the process of independent variable selection, processing and local regression, so as to realize the localization of different types of independent variables. In the regression process, the non-stationarity of the spatial relationship is detected and the target variable is predicted more efficiently and accurately; while ensuring the diagnosis of the local regression collinearity problem, by comparing a variety of local regression techniques, the trend term is analyzed based on the trend surface equation to eliminate the non-stationary Therefore, the spatial prediction accuracy of tar...

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Abstract

The invention relates to a soil organic carbon predication method based on geographically weighted regression. The soil organic carbon predication method contains a multicollinearity diagnosis technology and a comprehensive processing method in local regression. The main method comprises the following steps: (a) integrating a pre-processing technology for independent variables in global regression and local regression predication methods; (b) performing comprehensive diagnosis and processing mechanism on the collinearity problem of the independent variables in the universal geographically weighted regression; (c) carrying out applicability analysis on the geographically weighted regression method in a specific data set; (d) selecting the optimal independent variable set by adopting a method; and (e) comprehensively considering the spatial trends of the residual errors of the different regression methods. The calculation efficiency and accuracy of spatial attribute predication are improved by the comprehensive consideration for the spatial trends of the residual errors through contrastive analysis for the different independent variable sets and the collinearity degrees of the different independent variable sets in the local regression.

Description

technical field [0001] The invention belongs to a spatial analysis method oriented to spatial attribute prediction, in particular to a soil organic carbon prediction method based on geographic weighted regression. Background technique [0002] In the field of spatial analysis research, observations of variables are usually sampled by specific geographic units. Therefore, this value usually changes with the change of geographic spatial location, and the relationship between independent variables also changes significantly. This change in the relationship or structure between variables caused by changes in geographic location is called spatial non-stationarity. In geographic statistics and economic statistics, spatial non-stationarity is mainly attributed to three reasons: (1) caused by random sampling errors; (2) caused by differences in natural geographical environment, social management systems, and human habits in different regions; ( 3) The model used to analyze the spat...

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Application Information

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IPC IPC(8): G01N33/24
Inventor 宋效东刘峰张甘霖赵玉国李德成杨金玲吴华勇
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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