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Chain (US Survey)

The US survey chain is a unit of length used historically in land surveying in the United States. It is defined as exactly 66 US survey feet, which is slightly longer than the international foot. Since one US survey foot equals about 0.3048006096 meters, the US survey chain is approximately 20.11684 meters long.

Like the standard chain, it is divided into 100 links, each measuring 0.66 US survey feet. The US survey chain was widely used in the Public Land Survey System to measure land parcels and boundaries.

Key facts:

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  1 US survey chain = 66 US survey feet

  
  
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  1 US survey chain ≈ 20.11684 meters

  
  
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  10 US survey chains = 1 furlong

  
  
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  80 US survey chains = 1 US survey mile

  
  

Though the US survey foot and chain are being phased out in favor of international units, the US survey chain still appears in historical land records and some legal contexts.

Rope

A rope is a traditional unit of length used mainly in land measurement, especially in parts of India, Pakistan, and other South Asian countries. The exact length of a rope can vary by region, but it is generally around 20 to 25 feet (approximately 6 to 7.6 meters).

In some places, a rope is defined as 20 feet or 6.096 meters, and it is often used in agriculture and construction for measuring land or distances. The term “rope” is more of a customary or local measurement rather than a standardized unit like a foot or meter.

Because of its regional nature, the rope is not commonly used in international or scientific contexts, but it remains important in traditional surveying and rural land measurement in certain areas.