Management and conservation of Yokohama City Public Control Point

Yokohama City has set up a "Yokohama City Public Reference Point" in the city under the advice and guidance of the Geographical Survey Institute and the Japan Survey Association to supplement the national triangular point used as a reference point for surveying work. .
We can confirm survey result of Yokohama-shi public control point in "road account book reading system (image: 33KB)" which we install in Road and Highway Bureau road investigation section and each ward Public Works Office.
After the Great East Japan Earthquake, the survey results have been published as the "World Geodetic System (Detection Result 2011)".

Since the Yokohama City Public Control Point is mainly installed on the road, removal may be required during construction involving excavation on the road.
Therefore, in order to properly manage the Yokohama City Public Control Point, when performing construction work involving excavation on the road, etc.
About construction to contract after April 1, 2024, "Yokohama-shi public control point management conservation summary (February, 2024 revision) (PDF: 914KB)"
About construction contracted after March 31, 2024, "Yokohama-shi public control point management conservation summary (April, 2023 revision) (PDF: 691KB)"
Based on this, please consult with the City of Yokohama, Road and Highway Bureau Road Investigation Division.
Please refer to the documents on the public control points for specific procedures.

Type of Yokohama City Public Control Point

Types (Structural Diagram)	Details	Grade※	Installation location	Notation in Yokohama City Public Reference Point Network Map (Image: 42KB)	Sign	Remarks
Primary Key Point (PDF: 143KB)	Only the national triangular point is known as a known point.	First-class reference point	Mainly building roofs	◎		Eccentric point, orientation mark (including ground mark)
Primary supplementary points (PDF: 95KB)	This is an open point with the primary point as a known point. It can be used as a primary point.	First-class reference point	On the road (inside the manhole)	◉
Secondary Key Points (PDF: 121KB)	The primary point and primary complementary points are used as known points.	Second grade reference point	On the road	◻
Secondary node (PDF: 290KB)	This is the middle point between the primary point and the secondary point.	Second grade reference point	On the road	◯

※Classes according to Yokohama City Road Ledger Work Regulations
※February 29, 2024 Public control point management conservation summary is revised and becomes effective on April 1, 2024.