Change resampling method according to Oliver's mail


git-svn-id: https://svn.bgdi.admin.ch/mf-chsdi/trunk/chsdi@3781 e100092c-b5e6-494f-8bdf-19c1ff2a4001
update swissimage metadata legend

git-svn-id: https://svn.bgdi.admin.ch/mf-chsdi/trunk/chsdi@3782 e100092c-b5e6-494f-8bdf-19c1ff2a4001