In order to fully explore the application potential of optical remote sensing images in landslide monitoring, the article derives the landslide displacement optical image calculation formula based on the digital image correlation method. The formula adapts to the non-uniform deformation of landslides and the influence of natural illumination. Based on this formula, the article establishes a landslide displacement monitoring method based on optical images. The experiment analyzes the influence of the surface deformation mode and the amount of deformation on the calculation formula of landslide displacement optical image, and gives the change curve of the probability cumulative value of the calculation error under three different deformation modes of surface translation, rotation and distortion. The experimental results prove that 95％ of the calculation results of the formula are within 0.04 relative error. The article calculates the planar displacement field of a landslide using two-phase SkySat satellite optical images and analyzes the surface deformation characteristics of the landslide. The study provides a new technical reference for landslide disaster monitoring and early warning.
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