Hyperspectral image-based regional ecological risk assessment method

Abstract

The invention belongs to the field of soil environment monitoring and ecological risk assessment and relates to a hyperspectral image-based regional ecological risk assessment method. The method comprises the following steps that: 1) a soil sample in a study area is collected; 2) the laboratory chemical determination of the concentration of heavy metal in the soil sample is performed; 3) the imaging spectral data of the study area are acquired, and aeronautical hyperspectral data preprocessing is completed; 4) the inversion estimation of the concentration of various kinds of soil heavy metalsin the study area is realized on the basis of hyperspectral image data; and 5) the estimation results of the various soil heavy metals are inputted into an ecological risk assessment model, so that the ecological risk assessment mapping analysis of large-range continuous geospatial space with spatial pixels adopted as units, in the study area, can be obtained. The method has non-contact performance, is based on pixel-scale large-range continuous geospatial space, and can rapidly and efficiently carry out regional ecological risk assessment.

Description

Technical field [0001] The invention relates to the field of soil environment monitoring and ecological risk assessment, and in particular to a regional ecological risk assessment method based on hyperspectral images. Background technique [0002] At present, soil heavy metal pollution is one of the most widely polluted and most harmful environmental problems in environmental pollution. It has received widespread attention. Objective and true evaluation of the degree of heavy metal pollution in soil is of great importance to the control of environmental pollution and the protection of human health. significance. [0003] Xu Guiping et al. published an article "Research Summary of Soil Heavy Metal Pollution Evaluation Methods" in "Rural Economy and Technology" (2014 Vol. 25 No. 1). They introduced the evaluation methods of heavy metal pollution in soil commonly used at home and abroad. There are: single pollution index method, Nemerow index method, pollution load index method, envi...

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Problems solved by technology

[0008] Aiming at the problem that the ecological risk assessment method in the prior art can only realize comprehensive judgment based on multiple sampling points, and cannot form a continuous spatial regional ecological risk assessment, the present invention provides a non-contact, large-scale continuous geographical space, fast and efficient A regional ecological risk assessment method based on hyperspectral imagery based on spatial pixels

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