Journal
ENGINEERING GEOLOGY
Volume 222, Issue -, Pages 236-249Publisher
ELSEVIER
DOI: 10.1016/j.enggeo.2017.04.009
Keywords
Dip-slope mapping; Polygon auto-tracing; Daylight analysis; Python; LiDAR DEM
Funding
- Central Geological Survey of Taiwan [5226902000-04-95-04]
- Ministry of Science and Technology, Taiwan [MOST 105-2625-M-002-014, MOST-105-2116-M-001-019]
- Institute of Earth Sciences, Academia Sinica [IESAS2129]
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Dip-slope mapping is a fundamental task for landslide investigation and mitigation. However, most dip-slope mapping methods involve visual interpretations and manual processes that are inevitably subjective and time consuming. The advent of high-resolution digital elevation models (DEM) and increases in computing power have provided opportunities to improve the dip-slope mapping process. This study proposes a polygon auto tracing method for generating dip-slope maps based on airborne Light Detection and Ranging (LiDAR) data and a customized spatial analysis toolset developed in Python. This method requires the input of strata boundaries produced for sedimentary terrain based on 2 m resolution LiDAR DEMs. The method begins by deriving the raster layer of the dip direction of the bedding, and it then executes a series of raster calculations among the three raster layers slope, aspect, and dip direction to extract the dip-slope raster cells. Using the clustering pattern of the dip-slope raster cells, we implement the Point-Density analysis tool to determine the dip-slope areas. The ArcGIS ModelBuilder platform is used to lay out an automated workflow for the proposed polygon auto-tracing method using the customized toolset. For demonstration purposes, we successfully mapped 298 dip slopes in the study area, which frequently experiences dip-slope landslides and is located in the sedimentary terrain of northern Taiwan. The dip-slope mapping results were compared and validated against two government-funded visually interpreted dip-slope maps. Our dip-slope mapping results were also used in a daylight analysis along major freeways to identify potential locations of daylighted dip slopes.
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