Method for dividing and updating quality grades of cultivated land based on hyperspectral and soil indexes

By constructing a moisture-roughness coupling imbalance index, the degree of abnormality in the coupling effect is quantified and differentially corrected, thus solving the problem of coupling interference between soil moisture content and roughness and improving the accuracy and reliability of farmland quality grade classification.

CN121884009BActive Publication Date: 2026-06-16NANJING WANBO GEOGRAPHIC INFORMATION TECHNOLOGY CO LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING WANBO GEOGRAPHIC INFORMATION TECHNOLOGY CO LTD
Filing Date
2026-03-19
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing technologies have failed to effectively quantify the intrinsic physical coupling mechanism between soil moisture content and roughness, resulting in poor model generalization ability and robustness in the classification of arable land quality, and making it difficult to eliminate the impact of moisture-roughness coupling interference on the inversion of organic matter content.

Method used

By defining the moisture absorption depth and shadow ratio, a moisture-roughness coupling mismatch index is constructed to quantify the degree of coupling abnormality. Based on this index, a partitioning threshold is set to divide the region into three physical state zones. A differentiated correction strategy is adopted to eliminate the influence of coupling interference and improve the accuracy of organic matter content inversion.

Benefits of technology

It significantly improves the accuracy of soil organic matter content inversion, providing precise and reliable core indicator support for the classification of arable land quality, and is applicable to image data from different regions and time periods.

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Abstract

The present application relates to the technical field of cultivated land evaluation, and particularly relates to a cultivated land quality grade division and updating method based on hyperspectrum and soil indexes, wherein by defining and calculating water absorption depth and shadow proportion with clear physical meaning, respectively directly responding to water content and roughness, a water-roughness coupling disorder index is innovatively constructed, directly quantifying the abnormal degree of the coupling of the two, and converting the elusive coupling interference into a calculable and analyzable scalar; based on the statistical value of the water-roughness coupling disorder index of all pixels, a partition threshold is set, and the region corresponding to each pixel is divided into three physical state regions; and for different physical state regions, differentiated correction strategies are adopted, effectively eliminating the influence of water-roughness coupling interference on the inversion of organic matter content, significantly improving the index inversion accuracy, and taking into account the scientificity and practicality of the method, providing accurate and reliable core index support for subsequent cultivated land quality grade division.
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Citation Information

Patent Citations

  • Technical method for high-spectrum identification of soil property

    CN104697937A

  • Method for simultaneously estimating surface moisture and roughness of bare soil based on radar and optical remote sensing data

    CN113865523A