FUNDAMENTAL SURVEYING Coordinate Geometry (COGO) & Area Calculation 2

Question 1

What is the 'elevation factor' in state plane coordinate computation?

Accepted Answer

The ratio of Earth's radius to (Earth's radius + elevation)

Answer

The elevation (sea-level) factor = R divided by (R + h), where R is Earth's mean radius and h is the average elevation, reducing ground distances to sea-level distances.

Question 2

Point A is at coordinates (1000, 2000) and Point B is at (1300, 2400). What is the distance AB?

Accepted Answer

500 ft

Answer

Distance = sqrt((1300-1000)^2 + (2400-2000)^2) = sqrt(90000+160000) = sqrt(250000) = 500 ft.

Question 3

In COGO, the 'inverse' calculation determines:

Accepted Answer

The bearing and distance between two known coordinate points

Answer

Inverse computation takes two known coordinate points and calculates the bearing (or azimuth) and distance between them.

Question 4

What is a 'section' in the US Public Land Survey System (PLSS)?

Accepted Answer

A 640-acre square parcel that is 1 mile by 1 mile

Answer

A section is a nominally 1 mile by 1 mile square of land containing 640 acres, and 36 sections make up one township.

Question 5

The 'forward problem' (radiation) in COGO computes:

Accepted Answer

A new point's coordinates from a known point using bearing and distance

Answer

The forward (or direct) problem calculates the coordinates of an unknown point using a starting point, bearing, and distance.

FUNDAMENTAL SURVEYING Practice Test

FUNDAMENTAL SURVEYING Practice Test

FUNDAMENTAL SURVEYING Coordinate Geometry (COGO) & Area Calculation 2