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TitleSentinel-1 and RADARSAT constellation mission InSAR assessment of slope movements in the Southern Interior of British Columbia, Canada
AuthorChoe, B -Y; Blais-Stevens, AORCID logo; Samsonov, SORCID logo; Dudley, JORCID logo
SourceRemote Sensing vol. 13, issue 19, 2021 p. 1-17, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20210260
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
NTS92I; 92J; 92O; 92P; 93A; 93B
Lat/Long WENS-124.0000 -120.0000 53.0000 50.0000
Subjectsgeneral geology; radar imagery; satellites; satellite imagery; slope stability; slope development; remote sensing; landslides; synthetic aperture radar surveys (SAR)
Illustrationslocation maps; tables; graphs; satellite imagery; satellite images; plots
ProgramPublic Safety Geoscience Assessing landslides and marine geohazards
Released2021 10 06
AbstractLandslides are the most common natural hazard in British Columbia. The province has recorded the largest number of historical landslide fatalities in Canada, and damage to infrastructure comes at a great cost. In order to understand the potential impacts of landslides, radar remote sensing has become a cost-effective method for detecting downslope movements. This study investigates downslope movements in the Southern Interior of British Columbia, Canada, with Sentinel-1 and RADARSAT Constellation Mission (RCM) interferometric synthetic aperture radar (InSAR) data. The 2-dimensional time-series analysis with Sentinel-1 ascending and descending InSAR pairs from October 2017 to June 2021 observed distinct earthflow movements of up to ~15 cm/year in the east- west direction. The Grinder Creek, Red Mountain, Yalakom River, and Retaskit Creek earthflows previously documented are still active, with east-west movements of ~30 cm over the past four years. New RCM data acquired from June 2020 to September 2020 with a 4-day revisit capability were compared to 12-day Sentinel-1 InSAR pairs. The 4-day RCM InSAR pairs at higher spatial resolution showed better performance by detecting relatively small-sized slope movements within a few hundred meters, which were not clearly observed by Sentinel-1. The temporal variabilities observed from the RCM InSAR showed great potential for observing detailed slope movements within a narrower time window.
Summary(Plain Language Summary, not published)
This is a communication paper on the monitoring of slow moving earthflows in the southern Interior of British Columbia. It demonstrates the capacity of Sentinel-1 InSAR results over a four year period and the newly launched RCM InSAR results in a four month window.

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