Polarization information fused landslide identification method and device under complex background

Abstract

The invention belongs to the technical field of complete polarization synthetic aperture radar image processing, and particularly relates to a polarization information fused landslide identification method and device under a complex background, and the method comprises the steps: carrying out the registration of an image, which has the same polarization combination mode as the single-polarized SAR image before the landslide, in a single-polarized SAR image before the landslide and a PolSAR image after the landslide; constructing a dual-time-phase SAR image pair, and generating a coherence graph through coherent change detection to extract a change region; extracting a plurality of polarization characteristic parameters from the preprocessed PolSAR image after landslide, and fully fusing the polarization characteristic parameters by using TOPSIS with weight to carry out landslide detection so as to obtain a suspected landslide area; and fusing the change area and the suspected landslide area extracted from the coherence map through logic AND operation to obtain a final landslide area. According to the method, the TOPSIS is used for fusing the polarization information to perform landslide detection, and coherent change detection is combined, so that the accuracy of landslide detection can be greatly improved under the condition of effectively inhibiting the false alarm rate.

Description

technical field [0001] The invention belongs to the technical field of full-polarization synthetic aperture radar (PolSAR) image processing, and in particular relates to a landslide recognition method and device with complex backgrounds fused with polarization information. Background technique [0002] As one of the frequent and serious natural disasters, landslides can directly cause damage to buildings, interrupt transportation, and bring huge losses to residents' lives and property. Using Synthetic Aperture Radar (SAR) remote sensing satellite images to detect the position and boundary of post-disaster landslides and investigate the spatial distribution characteristics of landslides can provide important information for disaster prevention and disaster area reconstruction. There are two main ideas for landslide detection based on polarization decomposition. One is to use the multi-threshold method for landslide detection, that is, to set thresholds for multiple polarizati...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention proposes a complex background landslide identification method and device that integrates polarization information, utilizes the superior and inferior solution distance method (TOPSIS) to fuse polarization information for landslide detection, and then combines coherent change detection , can effectively suppress the false alarm rate, greatly improving the accuracy of landslide detection

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