01 / Surveying
A mathematician who met Inō Tadatakasurveyed the three provinces of Kaga.

Ishiguro Nobuyoshi (石黒信由, 1760–1836) was born in Takagi village (高木村) in Imizu District. He applied wasan, traditional Japanese mathematics, to land reclamation and surveying, and on the orders of the Kaga domain surveyed Etchū, Kaga and Noto. In 1803 he met the surveyor Inō Tadataka and went on to improve his instruments. The Kaetsunō Sanshū Gunwake Ryaku Ezu (加越能三州郡分略絵図), surveyed and drawn over eight years from 1819, is accurate even when compared with modern maps. 6,390 of his papers and maps are an Important Cultural Property.
- Met Inō Tadataka in 1803
- Eight years from 1819
- 6,390 items, Important Cultural Property