Adapting a Natura 2000 field guideline for a remote sensing-based assessment of heathland conservation status. - Johannes Schmidt; Fabian Ewald Fassnacht; Christophe Neff; Angela Lausch; Birgit Kleinschmit; Michael Förster; Sebastian Schmidtlein (Int. J. Appl. Earth Obs. Geoinformation, 2017)