Sea Island Mathematical Manual (double-difference surveying)
Agrimensura por doble diferencia (Manual matemático de la isla marina)
- Date
- 263 · confidence high
- Place
- Zibo, Shandong, China
- Credited to
- Liu Hui
- People
- 👤 Liu Hui225–295
- Field
- Knowledge & symbols
What was discovered
A method for measuring the height and distance of inaccessible objects, such as an island, using two observations from aligned points and similar triangles. It was the surveying manual of the Chinese administration.
What it led to
- surveying of rivers, mountains and walls
- scale cartography