Bulletin of Surveying and Mapping ›› 2024, Vol. 0 ›› Issue (1): 38-43,108.doi: 10.13474/j.cnki.11-2246.2024.0107

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Sub-pixel correlation-based slope monitoring using multi-temporal optical remote sensing images: a case study of Xiluodu hydropower station

YE Jiang1, LI Caiyi1, GAO Hongqi2, XU Weihong2, XIANG Nansong1   

  1. 1. College of Geosciences, Chengdu University of Technology, Chengdu 610059, China;
    2. Zhejiang Huadong Surveying, Mapping and Engineering Safety Technology Co., Ltd., Hangzhou 310014, China
  • Received:2023-04-08 Online:2024-01-25 Published:2024-01-30

Abstract: The monitoring of high slope in hydropower plant is a key issue in disaster prevention and control of hydropower plant. The use of satellite remote sensing technology for reservoir landslide monitoring is an important way to solve the problem. The use of subpixel correlation algorithm to obtain the ground deformation displacement field can overcome the phase decorrelation factors in SAR images, and has great potential application in the monitoring of hydropower station slopes. In this paper, Google Earth images from 2015 to 2019 and Sentinel-2 images from 2019 to 2022 were used as data sources, and the slope deformation variables were calculated by the phase correlation algorithm. The trend error such as orbit error was removed by constructing a first-order polynomial surface fitting model, and the slope deformation values of the downstream slope of Xiluodu Station in 2016, 2017, and 2019 were obtained. The analysis showed that the slope deformation values obtained from two images had the same trend, and were in good agreement with the measured data of valley width. The results of this paper verified the feasibility of applying the subpixel correlation matching technique, based on multi-temporal remote sensing data, for monitoring the slope deformation of large hydropower plants.

Key words: slope monitoring, optical remote sensing images, subpixel correlation, trend errors

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