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A small triangle with a central point.
Also known as: Sankakuten mark, Trig station mark
Denotes a triangulation station on a Japanese topographic map, a surveyed point of known horizontal position.
Marks a triangulation station of known horizontal position on a GSI topographic sheet.
Contexts: Maps
Puts the point at the centre of the triangle rather than at a vertex, so the symbol is unambiguous about which part of it is the measured position.
Contexts: Maps
A small triangle in plain outline with a single dot set at its centre, the dot marking the surveyed position.
The electronic reference point is a survey-point outline carrying an antenna stroke, not a triangulation station.
The levelling benchmark is the same construction with a square in place of the triangle.