"canoe"=>"yes","maxheight_referencelevel"=>"canal","motorboat"=>"yes","operator"=>"Hoogheemraadschap Rijnland","seamark:gate:category"=>"flood_barrage","seamark:gate:clearance_width"=>"4.4","seamark:information"=>"clearance estimated","seamark:name"=>"Keersluis","seamark:type"=>"gate","source:name"=>"Namesign","survey:date"=>"2021-07-11"