The evolution of instability at the A83 Rest and be Thankful from 2008 to 2023

High-resolution panoramic imagery has been systematically captured at the A83 Rest and be Thankful landslide site in Scotland since 2016. This paper describes the derivation of quantitative data from the imagery obtained from two of the stations from which panoramic imagery has been captured. The high-resolution panoramic imagery has been supplemented by earlier lower-resolution panoramic and non-panoramic imagery, where available, to extend the time period that the data cover. The data-capture process involves measuring reference areas and areas of apparent instability on each image in the time series. Normalized areas affected are then plotted over time as percentages. The data presented here provide significant and valuable insights into the extent and temporal change in instability on the hillside over the past 15 and 11 years for the northern and southern parts of the slope, respectively. The data represent percentage areas of apparent instability and show relative change over time. The changes measured and reported confirm other observations that the extent of instability within the last decade has increased significantly, and the panoramic imagery monitoring forms an integral part of the overall monitoring and inspection strategy.