A Landslide Equivalent Estimation Method Based on Multi-Source Remote Sensing Data

The equivalent information of a landslide (such as area and volume) is a crucial parameter in the study of landslideinduced geological hazards. Rapid and accurate estimation of the equivalent information of a landslide is of significant importance for emergency rescue operations in response to landslide disasters. However, traditional methods are time-consuming and labor-intensive, making it difficult to quickly estimate the landslide's equivalent parameters. To address this issue, we propose a landslide equivalent estimation method based on multisource satellite data. First, spatial information of the landslide area is obtained from multi-source satellite remote sensing data. The method of point spline estimation is then used to quickly calculate the landslide equivalent by determining the initial failure surface and volume of the landslide. The proposed method was implemented on the Sanmendong landslide in Zigui County, Hubei Province. The landslide equivalent estimation results show good consistency with the local measured data (landslide volume: 5.537 million cubic meters vs. 5.478 million cubic meters, landslide area: 259,000 square meters vs. 249,000 square meters), with an accuracy greater than 98%. This method enables the rapid and accurate estimation of landslide equivalent information with limited data, providing timely data support for disaster relief efforts.