Mapping & Platting Techniques Flashcards
7 cards from real CST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Mapping & Platting Techniques flashcards as text
Which vertical datum is most commonly referenced for elevations on current U.S. engineering and topographic plans?
Answer: NAVD 88
NAVD 88 is the official U.S. vertical datum, and NAD 83 is a horizontal datum.
A state that is elongated east-west, such as Tennessee, typically uses which State Plane projection?
Answer: Lambert Conformal Conic
Lambert Conformal Conic keeps scale distortion low for zones that extend east-west.
Each Universal Transverse Mercator (UTM) zone spans:
Answer: 6° of longitude
The 60 UTM zones are each 6° of longitude wide.
The angle between grid north and geodetic (true) north at a point is called the:
Answer: Convergence angle
Convergence (the mapping angle) is the difference between grid north and geodetic north.
To convert a measured ground distance to a State Plane grid distance, multiply it by the:
Answer: Combined factor (grid scale factor × elevation factor)
The combined factor reduces ground distance to the ellipsoid and then applies the projection scale.
With a magnetic declination of 10° East, a magnetic bearing of N 30° E corresponds to what true bearing?
Answer: N 40° E
For east declination, true azimuth = magnetic azimuth + declination, so 30° + 10° = N 40° E.
On a subdivision plat, the note "10' U.E." next to a dashed line most likely indicates a:
Answer: 10-foot utility easement
U.E. is the standard abbreviation for utility easement, usually drawn with dashed lines.