Abstract
Landslide inventory maps are critical to understand the factors governing landslide occurrence and estimate hazards or sediment delivery to channels. Numerous semi-automated approaches for landslide inventory mapping have been proposed to improve the efficiency and objectivity of the process, but these methods have not been widely adopted by practitioners because of the use of input parameters without physical meaning, a lack of transparency in machine-learning based mapping techniques, and limitations in resulting products, which are not ordinarily designed or tested on a large-scale or in diverse geologic units. To this end, this work presents a new semi-automated method, called the Scarp Identification and Contour Connection Method (SICCM), which adapts to diverse geologic settings automatically or semi-automatically using interventions driven by simple inputs and interpretation from an expert mapper. The applicability of SICCM for use in landslide inventory mapping is demonstrated for three diverse study areas in western Oregon, USA by assessing the utility of the results as a landslide inventory, evaluating the sensitivity of the algorithm to changes in input parameters, and exploring how geology influences the resulting landslide inventory results. In these case studies, accuracies exceed 70%, with reliability and precision of nearly 80%. Conclusions of this work are that (1) SICCM efficiently produces meaningful landslide inventories for large areas as evidenced by mapping 216 km2 of landslide deposits with individual deposits ranging in size from 58 to 1.1 million m2; (2) results are predictable with changes to input parameters, resulting in an intuitive approach; (3) geology does not appear to significantly affect SICCM performance; and (4) the process involves simplifications compared with more complex alternatives from the literature.
Highlights
Reliable landslide inventory maps are critical to understand the plethora of factors governing landslide occurrence
All of which have existing landslide inventories prepared by expert interpretation of LIDAR-derived imagery that may be used for comparison
This paper presents a new method for semi-automatically producing landslide inventories called the Scarp Identification and Contour Connection Method (SICCM)
Summary
Reliable landslide inventory maps are critical to understand the plethora of factors governing landslide occurrence. By inventorying landslides with such approaches, referred to as semi-automated, computers perform most tasks, while decisions are required by a human expert at relevant stages of mapping only. These semi-automated methods are diverse in the datasets that they use and in their complexity, but all serve to accelerate the inventory mapping process. Most methods are largely unproven in application to diverse topography and geology. They fail to distinguish and map individual landslides that may occur within a larger landslide complex
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