Name: LiDAR Sinkholes

Display Field: County

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Initital release (2015): The sinkhole maps are derived from LiDAR data using ArcGIS versions 10.1 and higher. LiDAR data were used to create digital elevation model (DEMs). Surface depressions were then extracted from the DEMs and visually inspected for sinkholes. Field verification suggests that the accuracy of the identified sinkholes to be real sinkholes is over 85%. LiDAR data were provided by the Louisville/Jefferson County Information Consortium (LOJIC) through Kentucky Division of Geographic Information. The LiDAR was flown in August, 2009 and the average point spacing is 1.0 meter. DEMs were created using LAS Class 2 surface with 5 feet resolution. Each sinkhole is presented as a polygon feature and the attribute table contains the following fields: SinkholeID: an 8-digit numerical code, in which the left three digits represent FIPS county code and the remaining five digits are sequential. Latitude: latitude of the centroid of the sinkhole Longitude: longitude of the centroid of the sinkhole Area sqft: the approximate surficial area of the sinkhole County: County location of the sinkhole Method: the method used for identifying the sinkhole Field Verified: Show if the sinkhole is checked and verified in the field. Updates: 2017: LiDAR sinkhole map for Fayette is added. LiDAR Sinkhole maps for Woodford, Boyle, and Jessamine Counties are added. While previous efforts used LiDAR point clouds, sinkholes mapped in 2017 used LiDAR-derived 5-ft DEMs. These DEMs are obtained from Kentucky Geography Network (http://kygeonet.ky.gov/). 2019 LiDAR sinkhole maps for Anderson, Bourbon, Franklin, Madison, Mercer, Shelby, and Scott counties are added.2022:LiDAR sinkhole maps for Clark, Garrard, Harrison, Montgomery, and Owen counties are added. Sinkholes mapped in 2022 used LiDAR-derived 5-ft DEMs. These DEMs are obtained from Kentucky's Elevation Data & Aerial Photography Program (https://kyfromabove.ky.gov/). The mapping work in 2022 is supported by the Paul Edwin Potter Internship Program.2024:This update adds sinkholes mapped for two groups of counties with different funding supports.One group consists of Breckinridge, Grayson, Hardin, LaRue, Marion, Meade, Nelson, and Washington counties, which were mapped in 2022 with support from the Federal Emergency Management Agency Pre-Disaster Mitigation grant project number PDMC-PL-04-KY-2018-012 The other group consists of Carroll, Gallatin, Grant, Henry, Spencer counties, which were mapped in 2023 with support from the Paul Edwin Potter Internship ProgramAdded sinkholes were mapped from LiDAR-derived 5-ft DEMs. These DEMs were obtained from Kentucky's Elevation Data & Aerial Photography Program (https://kyfromabove.ky.gov/)

Copyright Text: Kentucky Geological Survey

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Spatial Reference: 102100  (3857)

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Fields:

• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Latitude ( type: esriFieldTypeDouble, alias: Latitude )
• Longitude ( type: esriFieldTypeDouble, alias: Longitude )
• Area_sqft ( type: esriFieldTypeDouble, alias: Area_sqft )
• County ( type: esriFieldTypeString, alias: County Name, length: 12 )
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