Conversions, Formulae, Classifications for Surveyors Flashcards
To memorize frequently used formulae, memorize conversions, basic survey measurements, and classifications.
Conversion from Foot to Meter
1 foot = 0.3048 Meters
Conversion from Meter to Foot
1 meter= 3.28084 feet
Conversion from degrees Fahrenheit to degrees Celsius
°C=5/9(°F-32)
Conversion from degrees Celsius to degrees Fahrenheit
°F = °C×(9/5)+32
Dimensions of a square acre
208.71x208.71
Square footage of an acre
43560 square feet.
Old style USQS Quadrangle map
1:24,000 scale on 7.5 minute map
What is the length of a “Gunter’s Chain” ?
Edmund Gunter 100 links=66’, each link 7.92’ inches
What is the length of an Engineer’s Chain?
100’ , 1’ link.
Who was Benjamin Banneker?
Not inventor of chain, African American Surveyor from Maryland who helped to survey Washington DC in 1791. 40 markers placed, some still remain.
Conversion from Vara (Spanish territory measurement) to feet
1 vara= 2.7500005511811 feet, or divide Varas by 0.36
Conversion from feet to Vara (Spanish territory measurement)
1 foot= 0.36 Varas, or multiply foot by 0.36
NGS standard, 3rd order Class II
1:10,000
Traditional standard, Order AA
1 part in 100,000,000
Traditional standard, Order A
1 part in 10,000,000
Traditional standard, Order B, first order
1 part in 100,000 angles:(2”√N¹)
Traditional standard, Order B, second order, Class I
1 part in 50,000 angles:(3”√N)
Traditional standard, Order B
1 part in 1,000,000
Traditional standard, Order B, second order, Class II
1 part in 20,000 angles:(5”√N)
Traditional standard, Order B, third order, Class I
1 part in 10,000 angles:(10”√N)
Traditional standard, Order B, third order, Class II
1 part in 5,000 angles:(20”√N)
Engineering Construction (Fourth Order)
1 part in 2,500 or 1:2,500 angles:(60”√N)