O que é a chain in land surveying?

A surveyor's chain (Gunter's chain) é 66 feet ou 4 rods. It foi o padrão medindo tool for land surveys from 1620 into o 20th century. Ten square chains igual one acre, making area calculations straightforward.

Como muitos acres in a section?

A section in o US Public Land Survey Sistema é exatamente 640 acres (1 square mile ou sobre 259 hectares). A quarter section é 160 acres, e a quarter-quarter section é 40 acres.

O que é a rod in surveying?

A rod (também called a pole ou perch) é 16.5 feet ou 5.029 meters—exatamente one quarter of a chain. A square rod é 272.25 square feet. Lá são 160 square rods in an acre.

Land Surveying Unidades

Chains, Rods, e Modern Measurements

Learn Survey Unidades

Property deeds e land descriptions often use surveying terms like "chains," "rods," e "sections" esse date back centuries. Understanding estes unidades helps interpret property documents, understand land surveys, e converter entre historical e modern area medições.

Gunter's Chain Sistema

Edmund Gunter invented o surveyor's chain in 1620, creating a sistema esse elegantly links linear e area medições:

Unidade	Feet	Meters	Relationship
Link	0.66	0.201	1/100 chain
Rod (pole/perch)	16.5	5.029	25 links = ¼ chain
Chain	66	20.117	4 rods = 100 links
Furlong	660	201.17	10 chains
Mile	5,280	1,609	80 chains

Área Unidades from o Chain Sistema

Unidade	Square Feet	Square Meters	Acres
Square link	0.4356	0.0405	0.00001
Square rod	272.25	25.29	0.00625
Rood (¼ acre)	10,890	1,012	0.25
Square chain	4,356	404.7	0.1
Acre	43,560	4,047	1
Section	27,878,400	2,590,000	640

O Acre Relationship

An acre foi definido as 1 chain × 10 chains (66 ft × 660 ft = 43,560 sq ft). Este made calculations simples: count square chains e divide by 10 to get acres.

Converter Área Unidades

US Public Land Survey Sistema

O PLSS, established in 1785, divided public lands usando a hierarchical sistema:

Division	Size	Acres	Hectares
Township	6 mi × 6 mi	23,040	9,324
Section	1 mi × 1 mi	640	259
Half section	½ mi × 1 mi	320	130
Quarter section	½ mi × ½ mi	160	65
Quarter-quarter	¼ mi × ¼ mi	40	16

Este sistema ainda defines property boundaries across mais of o western United States.

Metes e Bounds

Older property descriptions (especially in o eastern US) use metes e bounds—directions e distances from reference points:

Comuns Terms

Metes: Measurements (distances)
Bounds: Boundaries (natural ou artificial features)
POB: Point of Beginning
Thence: De esse point

Exemplo Descrição

"Beginning at o antigo oak tree on Miller Road, thence N 45° E 10 chains to a stone marker, thence S 45° E 15 chains to Smith Creek..."

Modern Survey Unidades

Métrico Sistema

Modern surveying increasingly uses métrico unidades:

Distances: Meters (m)
Área: Square meters (m²) ou hectares (ha)
Coordinates: UTM ou latitude/longitude

GPS e GIS

Modern surveying uses:

GPS: Centimeter accuracy possible
GIS: Geographic Information Systems for mapping
Coordinates: Decimal degrees ou UTM

Despite modern technology, legal descriptions often ainda reference historical unidades.

Converting Survey Unidades

De	Para Feet	Para Meters	Para Acres
1 chain	66	20.117	—
1 rod	16.5	5.029	—
1 square chain	4,356 sq ft	404.7 sq m	0.1
1 square rod	272.25 sq ft	25.29 sq m	0.00625
1 rood	10,890 sq ft	1,012 sq m	0.25
1 section	27,878,400 sq ft	2,590,000 sq m	640

Conclusão

Land surveying uses a mix of historical e modern unidades. O chain-based sistema (onde 10 square chains = 1 acre) underlies muitos property descriptions ainda in use. O US Public Land Survey Sistema divides land into townships e sections. Understanding estes unidades helps interpret property deeds, legal descriptions, e historical documents—mesmo as GPS e métrico unidades become mais comum.