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≡ 404.685 642 24 m 2: square chain (US Survey) sq ch ≡ 66 ft (US) × 66 ft (US) = 1 ⁄ 10 US survey acre ≈ 404.6873 m 2: square foot: sq ft ≡ 1 ft × 1 ft: ≡ 9.290 304 × 10 −2 m 2: square foot (US Survey) sq ft ≡ 1 ft (US) × 1 ft (US) ≈ 9.290 341 161 3275 × 10 −2 m 2: square inch: sq in ≡ 1 in × 1 in: ≡ 6.4516 × 10 ...
These efforts are known as "High Accuracy Reference Network" (HARN) or "High Precision GPS Network" (HPGN). In addition, the basic unit of distance used is sometimes feet and sometimes meters. Thus a fully described coordinate system often looks something like: "Washington State Plane North, NAD83 HARN, US Survey feet".
These are the defining dimensions for NAD 27, but Clarke actually defined his 1866 spheroid as a = 20,926,062 British feet, b = 20,855,121 British feet. The conversion to meters uses Clarke's 1865 inch-meter ratio of 39.370432. The length of a foot or meter at the time could not practically be benchmarked to better than about 0.02 mm. [11]
The crested caracara (Caracara plancus), also known as the Mexican eagle, [3] is a bird of prey (raptor) in the falcon family, Falconidae. It was formerly placed in the genus Polyborus before being given in its own genus, Caracara .
NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico. It held fixed the height of the primary tide gauge benchmark , referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value, at Rimouski , Quebec , Canada .
Included in the law was a table of conversion factors between the traditional and metric units. The United States Coast Survey (which in 1878 became the U.S. Coast and Geodetic Survey) Office of Weights and Measures had on hand a number of metric standards, and selected the iron Committee Meter [6] and the platinum Arago Kilogram [7] to be the ...
United States customary units form a system of measurement units commonly used in the United States and most U.S. territories [1] since being standardized and adopted in 1832. [2] The United States customary system developed from English units that were in use in the British Empire before the U.S. became an independent country.
A number of units were used. One fanega was equal to 35 662.8 m 2 as it was legally defined. [1] Some other units and legal equivalents are given below: 1 caballeria = 12 fanegas 1 labor = 18 fanegas 1 sitio = 492.28 fanegas. [1] [3]