Hyperspectral remote sensing based estimation method and device for heavy metal content of soil

Abstract

The invention provides a hyperspectral remote sensing based estimation method and device for heavy metal content of soil. The method comprises the following steps: acquiring a reflectivity spectrum of hyperspectral remote sensing of to-be-tested soil; acquiring reflectivity in preset wave bands corresponding to to-be-tested heavy metal categories according to the reflectivity spectrum; estimating content of to-be-tested heavy metals in the soil with a pre-established soil heavy metal content estimation model according to the reflectivity. According to the method, the content of the to-be-tested heavy metals in the soil is calculated on the basis of the reflectivity in the preset wave bands (namely, sensitive bands of a characteristic spectrum of active substances for adsorbing and immobilizing the to-be-tested heavy metals in the soil) in the reflectivity spectrum, high-precision heavy metal content of the soil can be obtained, and wave band redundancy is reduced. By means of the reflectivity, with definite physical meaning, of a small quantity of the sensitive bands of the characteristic spectrum, higher-precision of estimation of the heavy metal content of the soil is realized, and the method has very good applicability.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a method and device for estimating soil heavy metal content based on hyperspectral remote sensing. Background technique [0002] Soil heavy metal pollution has become a serious environmental problem. Especially for regions with weak economic foundation and backward technological level. The irrational exploitation of natural resources, the discharge of production and domestic sewage, and the accumulation of waste residues have caused increasingly serious soil heavy metal pollution. After heavy metal pollutants enter the environment, they are diffused with the circulation of water and air, causing greater pollution from point sources to non-point sources. Since most heavy metals are not easily decomposed, heavy metals accumulate in the environment through biological chains, posing a serious threat to human health. [0003] The traditional evaluation method of soil heavy met...

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Problems solved by technology

In addition, there is a high correlation between adjacent bands of hyperspectral data, resulting in a large amount of data and prominent redundancy.

[0006] At present, research on soil heavy metal content estimation based on hyperspectral remote sensing reflectance spectrum does not select the obtained soil reflectance spectrum, and uses all reflectance spectral bands for soil heavy metal content estimation, resulting in low calculation accuracy and limiting hyperspectral remote sensing. Application in Estimation and Mapping of Soil Heavy Metal Content

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