Comparison of manually and automatically derived fresh-saline groundwater boundaries from helicopter-borne EM data at the Jade Bay, Northern GermanyBernhard Siemon, Annika Steuer, Nico Deus and Jörg ElbrachtE3S Web Conf., 54 (2018) 00032DOI: https://doi.org/10.1051/e3sconf/20185400032