Method and system for evaluating land degradation condition by fusing multi-source remote sensing indexes

Abstract

The invention discloses a method and system for evaluating a land degradation condition by fusing multi-source remote sensing indexes. The method comprises the following steps of acquiring a remote sensing image and carrying out image preprocessing according to the actual condition of a research area; carrying out the land utilization and land coverage classification on the preprocessed remote sensing image, and recoding different land types according to the influence on land degradation from small to large; extracting a vegetation coverage degree, a water and soil loss degree, a soil water content and a land wind erosion degree from the preprocessed remote sensing image; after data standardization is carried out on the image data of the five indexes, superposing the images, constructing acomprehensive land degradation index, and carrying out the function calculation; outputting a calculation result of the land degeneration degree according to the comprehensive land degeneration index, and grading the land degeneration condition according to the comprehensive land degeneration index. The comprehensive land degradation index is obtained by integrating the plurality of indexes, so that the land degradation condition is quickly identified from the remote sensing image.

Description

technical field [0001] The invention relates to the technical field of remote sensing and ecological environment protection, in particular to a method and system for comprehensively evaluating land degradation status by integrating multi-source remote sensing indicators. Background technique [0002] Land resources provide important material conditions for human survival and development. However, in recent years, irrational land use and poor management of land resources, coupled with population expansion, have led to serious land degradation around the world. Land degradation refers to the reduction or loss of land biological or economic production capacity caused by human activities, coupled with the impact of natural processes such as climate change, which amplifies the impact of land degradation. [0003] Remote sensing and geographic information systems (GIS) technology have achieved good results in land degradation research, but the commonly used land degradation indic...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, only a single indicator or a few indicators are used to evaluate the land degradation status, which cannot fully reflect the degree of land degradation and the spatio-temporal characteristics, resulting in insufficient evaluation data of the land degradation status in the research area. Accurate, timely feedback and measures cannot be effectively made according to the state of land degradation. The present invention provides a method and system for evaluating the state of land degradation by integrating multi-source remote sensing indicators, which solves the problem of the inability to comprehensively and comprehensively evaluate the state of land degradation in the prior art The problem is to propose a land degradation index for comprehensive assessment of land degradation, which provides effective support for ecological environment investigation and land degradation disaster reduction

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