Automatic geometric correction and orthorectification method for multispectral remote sensing satellite images of mountainous area

Abstract

The invention discloses an automatic geometric correction and orthorectification method for multispectral remote sensing satellite images of a mountainous area. The method comprises the following steps of: selection and splicing of reference images; automatic selection of object points with same names; screening of the object points with same names, and geometric correction and orthorectification for correcting the images; precision evaluation; and output of the images. The multispectral remote sensing satellite images of the mountainous area, such as images of China domestic environment and disaster monitoring small satellite (with the model HJ-1A/B), have the characteristic of serious geometric distortion, but the automatic geometric correction and orthorectification method can be used for performing the orthorectification on the multispectral remote sensing satellite images of the mountainous area in mass and generating residual error reports of the coherent images by adopting a concept of the object points with same names to implement the geometric correction and orthorectification. The automatic geometric correction and orthorectification method has the advantages of high efficiency and precision, is very efficient when being used for processing the multispectral remote sensing satellite images with mass data of the mountainous area, can remarkably save manpower and material resources needed by the conventional remote sensing image processing process, and particularly is beneficial to the processing of the images of the China domestic environment and disaster monitoring small satellite.

Description

technical field [0001] The invention relates to a method for geometric correction and orthorectification of multi-spectral remote sensing satellite images in mountainous areas, in particular to an automatic geometric correction and orthorectification method for multi-spectral remote sensing satellite images in mountainous areas required in the aerospace field, belonging to the multi-spectral area in mountainous areas. The field of computer processing of remote sensing satellite images. Background technique [0002] The geometric correction and orthorectification of remote sensing satellite images are the basic work of remote sensing image preprocessing, and also a key step in the later application of remote sensing satellite images to carry out aspects such as ecological environment monitoring, disaster monitoring and assessment. In practical applications, the geometric distortion of remote sensing satellite images is relatively serious. figure 1 It shows the principle of g...

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Problems solved by technology

Therefore, using traditional algorithm principles to carry out geometric correction and orthorectification of mountainous side-view multispectral remote sensing satellite images with large geometric distortions and complex causes, such as multispectral remote sensing satellite images captured by China's domestic environmental disaster reduction satellite, cannot be corrected accurately Distortion in imagery, especially geometric distortion caused by terrain

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