Study on the Applicability of Ascending and Descending Orbit Sentinel-1A Data in Geological Hazard Monitoring in High Mountainous Canyon Areas
In response to the difficulty in selecting the appropriate ascending or descending orbit Sentinel-1A data for geological hazard monitoring in high mountainous canyon areas using InSAR technology,this article uses SBAS-InSAR technology and combines slope and aspect data to calculate the deformation values of the vertical slope direction and along the slope direction in the study area.The applicability of the lifting rail Sentinel-1A data source for different slope directions in geological hazard deformation monitoring is studied.The results indicate that:1)Sentinel-1A ascending orbit data are more suitable for monitoring deformation information on north-facing and east-facing slopes,while descending orbit data are more suitable for monitoring deformation information on south-facing and west-facing slopes.2)Deformation rates along the slope are greater than vertical slope deformation rates on north-facing slopes;the difference between along-slope and vertical slope deformation rates is not significant on south-facing slopes;vertical slope deformation rates are greater than along-slope deformation rates on east-facing slopes;both vertical and along-slope deformations are significant on west-facing slopes.Therefore,combining ascending and descending orbit data can address the issue of insufficient accuracy of monitoring results for certain areas or specific angles using a single orbit,and can provide more comprehensive and accurate deformation information.
small baseline subset interferometric synthetic aperture radar(SBAS-InSAR)Sentinel-1A data sourceTwo-dimensional deformation decompositiondeformation monitoringgeological hazard
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