Sinkhole Coverage in Kentucky

These data represent digital GIS sinkhole coverage for all of Kentucky. The highest elevation, closed, topographic contour of each mapped sinkhole was digitized as a GIS polygon. The second highest elevation contour was also digitized where very large, shallow, karst valleys were so expansive that the area covered by the polygon obscured patterns in sinkhole distribution. These karst valleys are mostly confined to the Western Pennyroyal. The spacing of contour intervals on the topographic maps of the state vary in from 40 foot to 10 foot. No attempt was made to use a constant elevation, standardize the outline to a uniform contour interval, or record the elevation of the digitized contour. Digitization was done onscreen using digital raster graphic files of the 7 ½ minute topographic contours, registered and projected to the Kentucky State Plane coordinate system. Download Link: https://kgs.uky.edu/kgsweb/download/karst/kysinks.zip本数据集涵盖肯塔基州全域的数字化地理信息系统（Geographic Information System，GIS）天坑覆盖范围数据。针对每一处已测绘天坑，将其最高海拔闭合地形等高线数字化为GIS多边形。当巨型浅埋喀斯特山谷分布范围极广，以至于其多边形覆盖范围会掩盖天坑分布特征时，也会对第二高海拔等高线进行数字化处理。此类喀斯特山谷主要集中于西彭尼罗亚尔区域。该州地形图的等高距范围为10英尺至40英尺。本次数据处理未采用固定海拔基准，未将轮廓统一至标准等高距，亦未记录数字化等高线的海拔数值。数字化工作依托7.5分幅地形等高线的数字栅格图形文件完成，该文件已完成配准并投影至肯塔基州平面坐标系。下载链接：https://kgs.uky.edu/kgsweb/download/karst/kysinks.zip