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A small square with a central point.
Also known as: Suijunten mark, Levelling point mark
Denotes a levelling benchmark on a Japanese topographic map, a surveyed point of known height.
Marks a levelling benchmark of known height on a GSI topographic sheet.
Contexts: Maps
Differs from the triangulation station only in its outer shape, so the set encodes horizontal against vertical control by triangle against square.
Contexts: Maps
A small square in plain outline with a single dot at its centre, matching the triangulation station in construction.
The triangulation station is the same construction with a triangle in place of the square.
The electronic reference point adds a short upright antenna stroke to a survey-point outline.