Sinkholes from contours

Discussion created by Alesinar on Nov 1, 2013
Latest reply on Nov 5, 2013 by Alesinar

I'm new to this forum so I don't know if this is the right place to post this so if you know a better place please direct me there.

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.