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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

  1. Under National Map Accuracy Standards, for maps at scales larger than 1:20,000, 90% of well-defined points must be within what horizontal tolerance?

    Answer: 1/30 inch

    NMAS allows 1/30 inch at publication scale for scales larger than 1:20,000.

  2. Under National Map Accuracy Standards, 90% of tested elevations must be accurate to within:

    Answer: One-half of the contour interval

    NMAS vertical accuracy requires 90% of tested points within one-half the contour interval.

  3. A legal description reading 'Lot 7, Block 3, Oak Ridge Addition' relies on which system?

    Answer: Lot and block (recorded plat)

    Lot and block descriptions refer to a subdivision plat recorded in public records.

  4. A standard, full section in the Public Land Survey System contains approximately:

    Answer: 640 acres

    A standard section is one mile square, about 640 acres.

  5. In a standard PLSS township, section 36 is located in which corner?

    Answer: Southeast

    Sections are numbered back and forth starting with 1 in the northeast corner, so 36 ends in the southeast corner.

  6. Contour lines with short tick marks (hachures) pointing inward indicate:

    Answer: A closed depression

    Hachured contours show a depression whose ground falls toward the center.

  7. What is the main advantage of a graphic (bar) scale over a written scale on a map?

    Answer: It stays accurate when the map is enlarged or reduced

    A bar scale changes size along with the map, so it remains correct after photocopy scaling.