Sentinel-1 and RADARSAT Constellation Mission InSAR Assessment of Slope Movements in the Southern Interior of British Columbia, Canada

Abstract

Landslides 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.

Ambiguity Detection in Repeat-Pass Ship Detection Mode RCM Imagery

“…In June 12, 2019 Canada had successfully launched the RADARSAT Constellation Mission (RCM), a trio of C-band Synthetic Aperture Radar (SAR) Earth observation satellites spaced equally in a common orbit. While its predecessor single RADARSAT-2 and the European Space Agency's duo Sentinel-1 C-band satellites offer revisit capabilities of 24-day and 12-day, respectively, the RCM trio offers an improved temporal resolution of a 4-day repeat cycle [1][2][3]. False alarms (FAs) pose a major challenge for operational ship detection applications in RCM imagery.…”

Eastern Arctic Sea Ice Sensing: First Results from the RADARSAT Constellation Mission Data

“…Because RCM was launched only recently, most studies on RCM are based on simulation data using quad-polarized RADARSAT-2 images [2]. The applicability of different satellite platforms (including Radarsat-2, Sentinel-1 and RCM) are analyzed in [11,12] for landslide monitoring. The authors emphasized the RCM advantages of a shorter revisit time and higher spatial resolution for the detection of small-sized slope movements, compared with previous SAR satellites.…”