標高(ひょうこう)River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 海抜高度(かいばつ・こうど)River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 高度角River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 飛行高度基準面からの高さ(hikō-kōdo)River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 仰角(gyōkaku)River and Water Resources Glossary (Infrastructure Development Institute Japan)