RPLS Technical Standards and Specifications 3

Question 1

The National Map Accuracy Standards (NMAS) specify that for maps at scales larger than 1:20,000, no more than 10% of tested points may be in error by more than:

Accepted Answer

1/30 inch at publication scale

Answer

NMAS horizontal accuracy for maps larger than 1:20,000 requires that 90% of tested points fall within 1/30 inch of their true position at publication scale.

Question 2

What is the primary purpose of a 'datum' in surveying?

Accepted Answer

A reference surface from which elevations or positions are measured

Answer

A datum is a defined reference surface (horizontal or vertical) from which all measurements in a survey are referenced.

Question 3

According to NGS specifications, what is the difference between a benchmark and a bench mark?

Accepted Answer

They are the same; 'benchmark' is the common spelling and 'bench mark' is the NGS official spelling

Answer

NGS officially uses 'bench mark' (two words) for vertical control monuments, though 'benchmark' (one word) is widely accepted as equivalent.

Question 4

In a stadia survey, if the stadia interval factor is 100 and the rod interval is 1.52 feet, what is the horizontal distance to a level rod?

Accepted Answer

152 feet

Answer

Horizontal stadia distance = rod interval × stadia constant = 1.52 × 100 = 152 feet when the line of sight is horizontal.

Question 5

Which specification governs the accuracy and content of FEMA Flood Insurance Rate Maps (FIRMs)?

Accepted Answer

FEMA Guidelines and Specifications for Flood Hazard Mapping Partners

Answer

FEMA's Guidelines and Specifications for Flood Hazard Mapping Partners define the technical requirements for FIRM production and maintenance.

(RPLS) Registered Professional Land Surveyor Practice Test

(RPLS) Registered Professional Land Surveyor Practice Test

RPLS Technical Standards and Specifications 3