Land desertification extraction method and device fusing multiple vegetation indexes

Abstract

The embodiment of the invention provides a land desertification extraction method and device fusing multiple vegetation indexes, and the method comprises the steps: firstly obtaining the landsat satellite data of a target region, and carrying out the multiple correction, and obtaining the target satellite data; secondly, generating an image map of the target area according to the target satellite data, clipping the image map by adopting a preset first shp file to obtain a plurality of sub-maps, and then extracting a vegetation coverage index, a soil vegetation removal index and an enhanced vegetation index corresponding to each sub-map by adopting a preset second shp file; and finally, judging a desertification result of the target region based on the vegetation coverage index, the soil vegetation removal index and the enhanced vegetation index corresponding to each sub-graph, generating script data corresponding to the desertification evaluation model according to the desertification result, and storing the script data. Therefore, fusion analysis can be carried out on the vegetation coverage index, the soil vegetation removal index and the enhanced vegetation index, so that the accuracy and reliability of a desertification judgment result are ensured.

Description

technical field [0001] The invention relates to the technical field of land desertification analysis, in particular to a method and device for extracting land desertification by integrating multiple vegetation indices. Background technique [0002] Desertification is a process of land degradation in arid, semi-arid and semi-humid areas caused by human and climate factors. With the rapid increase of population and the deterioration of climate and other environmental factors, land desertification has developed rapidly, seriously threatening the living environment of human beings and restricting the sustainable development of social economy. Land desertification has not only become an important ecological and environmental problem facing the world, but also It is an important economic and social issue. How to effectively slow down and prevent desertification has become the focus and hotspot of the current global ecological environment research, and the prevention and control m...

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Problems solved by technology

[0004] The vegetation coverage model based on a single vegetation index algorithm is a commonly used method for extracting land desertification. However, related studies have found that in arid and semi-arid areas where land desertification occurs frequently, the single vegetation index algorithm (such as NDVI) is easily affected by precipitation. This makes the normalized difference vegetation index low in drought or sandy areas, which often causes abnormalities in the extraction of desertification information, making it difficult to obtain accurate desertification judgment results

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