| 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）。 |