Pike County, OH: A Case Study in Building Repeatable Method for Creating a Landslide Susceptibility Map
Type of Submission
Poster
Keywords
GIS, landslide, susceptibility, Pike County, Ohio, ArcGIS
Abstract
This project developed a repeatable method for creating landslide susceptibility maps in Ohio using ESRI’s ArcGIS program. The method would be repeatable for other states where high quality LiDAR data is available. Pike County, OH was selected for its landslide-favorable topography, then the target area was further constrained to the northeast corner. Scientific literature suggested factors affecting slope failure: slope angle, land use, presence of previous failures, surficial geology, soil properties, and vegetation. GIS data was gathered online, fit to the target area by the Clip and Raster Clip tools, and properly symbolized. A grid was placed over the area using the Create Fishnet tool, then using Ohio Department of Natural Resources (ODNR) imagery as well as techniques from GIS literature, potential landslides were delineated by polygon drawing. After creating a landslide inventory, the factors affecting slope failure were calculated, properly scaled by the Reclassify tool, and then aggregated together using the Raster Calculator tool. The aggregation formula was determined by giving greater weight to factors more often present for slope failures. The area was field checked and ground photographed on March 12, 2016, confirming the landslides identified by photograph. Landslides more recent than the ODNR imagery were noted and photographed. After researching the online availability of statewide imagery, it was concluded that this method would be repeatable for many states in the USA, although some do not have high resolution imagery freely available.
Campus Venue
Stevens Student Center
Location
Cedarville, OH
Start Date
4-20-2016 11:00 AM
End Date
4-20-2016 2:00 PM
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
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Pike County, OH: A Case Study in Building Repeatable Method for Creating a Landslide Susceptibility Map
Cedarville, OH
This project developed a repeatable method for creating landslide susceptibility maps in Ohio using ESRI’s ArcGIS program. The method would be repeatable for other states where high quality LiDAR data is available. Pike County, OH was selected for its landslide-favorable topography, then the target area was further constrained to the northeast corner. Scientific literature suggested factors affecting slope failure: slope angle, land use, presence of previous failures, surficial geology, soil properties, and vegetation. GIS data was gathered online, fit to the target area by the Clip and Raster Clip tools, and properly symbolized. A grid was placed over the area using the Create Fishnet tool, then using Ohio Department of Natural Resources (ODNR) imagery as well as techniques from GIS literature, potential landslides were delineated by polygon drawing. After creating a landslide inventory, the factors affecting slope failure were calculated, properly scaled by the Reclassify tool, and then aggregated together using the Raster Calculator tool. The aggregation formula was determined by giving greater weight to factors more often present for slope failures. The area was field checked and ground photographed on March 12, 2016, confirming the landslides identified by photograph. Landslides more recent than the ODNR imagery were noted and photographed. After researching the online availability of statewide imagery, it was concluded that this method would be repeatable for many states in the USA, although some do not have high resolution imagery freely available.
