My new peer-reviewed article titled “Automated delineation of karst sinkholes from LiDAR-derived digital elevation models” has been published in the latest issue of Geomorphology. You can download a free online copy using this link: http://authors.elsevier.com/a/1T3d9_,Oh6mAl8 (expires on July 8, 2016). In this paper, we present a localized contour tree method for automated extraction of sinkholes in karst landscapes. The study area was Fillmore County in southeastern Minnesota, USA. See some figures below:
Fig. 1. Distribution of sinkhole inventory points in Fillmore County, Minnesota, USA.
Fig. 3. Contour representation of a compound surface depression. (a) Contours overlain on DEM shaded relief. (b) Elevation profile of the transect A–B shown in (a).
Fig. 8. LiDAR DEM shaded relief (a) and examples of extracted sinkhole boundaries overlain on LiDAR DEM shaded relief (b) and color infrared aerial imagery (c).
Fig 9. Sinkhole boundaries delineated using different methods. (a) The sink-filling method. (b) The localized contour tree method.