As he found that the available root maps to edo were sloppy , he compiled a collection of materials called " dainihon tenka shikai gazu " (he completed its transcription in january , 1752 ), which , he stated , ' covered all the mountains , rivers , seas and islands .' 当時の江戸までの道中の地図資料のいい加減なところから、「山川海島悉く図する」資料集の『大日本天下四海画図』を起筆した(宝暦1年(1752)12月上旬に書写作業完了)。