Surveying & Geomatics Flashcards
6 cards from real BCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Surveying & Geomatics flashcards as text
What is the maximum allowable misclosure for a first-order leveling survey per mile according to FGCS standards?
Answer: 3 mm × √K
First-order class I leveling allows a maximum misclosure of 3 mm × √K (where K is the distance in kilometers), making it the most precise standard.
In a closed traverse, the sum of interior angles of a polygon with n sides should equal:
Answer: 180(n-2) degrees
The sum of interior angles of a closed polygon with n sides = (n-2) × 180°, which is the angular closure condition for a closed traverse.
LiDAR (Light Detection and Ranging) in surveying measures distance by:
Answer: Measuring the travel time of laser pulses
LiDAR measures distance by emitting laser pulses and measuring the time for the reflected pulse to return, enabling highly accurate 3D point cloud data collection.
What is a 'backsight' in differential leveling?
Answer: A rod reading taken on a point of known elevation
A backsight (BS) is a rod reading taken on a point of known elevation to establish the height of instrument (HI = known elevation + BS).
Which map projection preserves true direction from a central point, making it useful for navigation?
Answer: Azimuthal equidistant projection
The azimuthal equidistant projection preserves true direction and distance from the central point, making it useful for navigation and communication planning.
The index contour on a topographic map is typically shown as:
Answer: A thicker, darker brown line labeled with elevation
Index contours are every fifth contour line, shown as thicker, darker lines labeled with their elevation to make the map easier to read.