When he was Genroin gikan, he carried out survey starting from Nemuro of Hokkaido, and going north along Chishima (Kurile) Islands to Shumushu Island, and on the way back he continued to survey Kunashiri Island and the inland area of Hokkaido as he was moving by land from Nemuro, so that he compiled 'The opinions on the guards of Chishima and the reclamation of Hokkaido.'
元老院議官時代には、北海道の根室から千島列島を北上して、シュムシュ島に渡り、帰りには国後島や根室から陸路北海道の内陸部を調査し「千島警備及び北海道開拓に対する意見書」をまとめた。