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A low arched outline over a base line.
Also known as: Onshitsu mark, Polytunnel mark
Denotes a greenhouse or plastic growing tunnel on a Japanese topographic map, introduced as protected cultivation spread.
Marks a greenhouse or plastic growing tunnel on a GSI topographic sheet.
Contexts: Maps
Draws the structure in section rather than in plan, because a tunnel's plan outline would be indistinguishable from an ordinary field boundary.
Contexts: Maps
A shallow arc springing from both ends of a horizontal base line, taking the section of a growing tunnel.