http://www.vocabularyserver.com/gemet/en/http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=8480tide http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=8480 sea level BT http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=8480 tidal water RT http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=8480 intertidal zone RT