Monitoring method of freezing injury of winter wheat based on high-resolution satellite remote sensing data

Abstract

The invention proposes a winter wheat freezing injury monitoring method based on high-resolution satellite remote sensing data, which is used to solve the problems of lack of quantitative models and low precision in existing winter wheat freezing injury monitoring. The steps of the present invention are: acquisition of ground survey sample points; acquisition and preprocessing of Gaofen No. 1 satellite remote sensing data; extraction of winter wheat planting space distribution; calculation of the normalized vegetation index layer of the preprocessed Gaofen satellite remote sensing data using bands , superimposed with the spatial distribution results of winter wheat planting; acquisition of winter wheat vegetation index at ground survey points; normalization of NDVI in winter wheat planting area; calculation of NDVI ratio of vegetation index; delineation of disaster level. The present invention amplifies the difference of the vegetation index through the method of ratio, quickly monitors the winter wheat freezing damage, quickly estimates the occurrence and scope of the disaster, combines the ground survey to divide the disaster level, and carries out agricultural insurance for the loss caused by the evaluation disaster. Fast claim settlement is of great significance.

Description

technical field [0001] The invention relates to the technical field of remote sensing monitoring of winter wheat freezing damage, in particular to a monitoring method for winter wheat freezing damage based on high-resolution satellite remote sensing data. Background technique [0002] Freezing injury is one of the more serious and common natural disasters of winter wheat, which has a serious impact on the growth and development of winter wheat, and ultimately affects the yield, thus making the problem of food security more prominent. In recent years, winter wheat frost damage has occurred frequently. In 2018, the severely frozen area of ​​wheat in Henan and Shandong was about 1 million mu. Freezing damage has become one of the important factors restricting the high yield of wheat. However, for a long time, the extent of frost damage has been mainly determined by observing the minimum ground temperature at fixed points, combined with the growth period of winter wheat, to esti...

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Problems solved by technology

[0004] Aiming at the technical problems of lack of quantitative models and low precision in the existing methods of monitoring winter wheat freezing damage using satellite remote sensing data, the present invention proposes a monitoring method for winter wheat freezing damage based on high-resolution satellite remote sensing data. Through the ratio method, the amplification process is carried out, and the winter wheat frost damage is monitored with the help of the domestic Gaofen-1 satellite data, which greatly improves the accuracy and efficiency, and breaks through the traditional technology.

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