Sinkholes from contours

Discussion created by Alesinar on Nov 5, 2013
Latest reply on Nov 12, 2013 by Alesinar

For my diploma I'm trying to compare differnt methods of sinkholes extraction. For this purpose I would like to automaticly extract sinkholes from contours shapefile. While I succesfuly extracted the lowest contour of the sinkhole I have no idea how to select/extract the second, third... if a sinkhole has it.
Any suggestion will be more than welcome. Although I came across an article I do not fully understand the method used so I'm also posting a link to that article if anyone has time to check it and possibly exsplain something to me.

Thank you very much.