survey mile

Thân thiện

A surveyor measures a distance of one survey mile across an open field.

Definition

Noun: A survey mile is a unit of length used in the United States, defined as exactly 1609.347 meters. Its length is derived from the historical U.S. survey foot, where one meter was considered equal to 39.37 inches.

Usage

The term "survey mile" is used specifically in the context of land surveying, mapping, and legal land descriptions in the United States. It distinguishes this measurement from the more common international mile (or statute mile).

Examples

• The property boundary was measured to be exactly one survey mile from the old oak tree.
• Early U.S. topographic maps used the survey mile as a basis for their coordinate grids.
• The difference between a survey mile and an international mile is about 3.2 millimeters.

Advanced Usage

• Historical Context: The survey mile was the standard unit for U.S. public land surveys (the Public Land Survey System). While the international mile (1609.344 meters) is now more common, many existing land records and geodetic datums in the U.S. are still based on the survey mile.
• Technical Distinction: In precise geodetic science and cartography, specifying "survey mile" is crucial for accuracy, as using the wrong mile definition can lead to cumulative errors over long distances.

Variants and Related Words

• U.S. survey mile: A full name often used to avoid ambiguity.
• Statute mile or international mile: The more commonly used mile today, defined as exactly 1609.344 meters.
• Survey foot: The unit (1200/3937 meters) from which the survey mile (5280 survey feet) is derived.

Synonyms

• U.S. land mile: An occasional synonym, though less precise.

Notes

This is a specialized technical term. In everyday language and most modern contexts, the word "mile" alone refers to the international mile. The survey mile is primarily encountered in historical documents, specific legal descriptions, and certain fields of engineering and surveying.

Học thuật

Noun

1. a U.S. unit of measure equal to 1609.347 meters; derived from the use of 39.37 inches as the conversion for one meter