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Topographic Mapping

Topographic mapping is the process of representing the Earth's surface on a map, showing both natural and man-made features together with their elevations and contours. It provides essential data for engineering, planning, and environmental studies.

Purpose of Topographic Surveying

To collect data necessary for the preparation of a topographic map — including ground elevations, landforms, streams, roads, and built structures.

Contour Lines

Determining Elevations and Flow Directions

Practical Application

Topographic maps help engineers determine suitable locations for roads, drainage systems, and structures. Understanding contour behavior ensures proper design and avoidance of slope instability and flooding risks.

Key Terms

Contour line → connects points of equal elevation.
Contour interval → elevation difference between successive contours.
Hachure → short line indicating a depression.
Benchmark → fixed reference point of known elevation.

Typical contour interval used in engineering maps: 10 m

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Exam Generator Problems

Additional board-style practice items for this topic.

Question Bank: t61

MSTE - Surveying / Map Scale / Civil Engineering Refresher

A 640 sq.m lot is 25.6 cm2 on a map. Find the map scale x where the ratio is 1:x.

  1. 500
  2. 250
  3. 1000
  4. 750
Convert the actual area to square centimeters:
$640\text{ m}^2 = 6,400,000\text{ cm}^2$
For an area scale, $x^2 = \frac{\text{actual area}}{\text{map area}}$.
$x^2 = \frac{6,400,000}{25.6} = 250,000$
$x = \sqrt{250,000}$
$\boxed{x = 500}$

Question Bank: t1119

MSTE - Surveying / Measurements and Areas / Gemini mapped Chapter 7 to 10

Lines of levels are run from station A to station B over three different routes. The route length and difference in elevation between A and B are given in the following table [Route 1: 6.2 km, 425.34m; Route 2: 5.8 km, 424.12m; Route 3: 3.8 km, 426.45m]. Determine the most probable value of the elevation of station B if station A is at elevation 187.235 m.

  1. 613.685
  2. 612.386
  3. 613.125
  4. 612.712

Solution pending in psadquestions/t1119.json.

Question Bank: t1306

MSTE - Highway Engineering / Curves, Earthworks, and Traffic Engineering / Gemini mapped Chapter 7 to 10

The flow of traffic along North Reclamation is 1800 vehicles per hour with a space mean speed of 90 kph. The highest 5-minute volume is 214 vehicles.

Determine the traffic density in vehicles per km.

  1. 30
  2. 25
  3. 15
  4. 20

Determine the spacing of vehicles in meters.

  1. 50
  2. 45
  3. 55
  4. 60

Determine the peak hour factor (PHF).

  1. 0.8
  2. 0.7
  3. 0.75
  4. 0.85

Solution pending in psadquestions/t1306.json.

Question Bank: t1353

MSTE - Highway Engineering / Curves, Earthworks, and Traffic Engineering / Gemini mapped Chapter 7 to 10

Graphically represent, in a two-dimensional format on a plan or map, the shape or morphology of the terrain.

  1. contour
  2. elevation
  3. altitude
  4. topography

Solution pending in psadquestions/t1353.json.

Question Bank: w55

MSTE - Highway Engineering / Curves, Earthworks, and Traffic Engineering / MSTE May 2019

A device mounted on a fixed support (permanent signs) or portable support (temporary signs) whereby a specific message is conveyed by means of words or symbols placed or erected for the purpose of regulating, warning or guiding traffic.

  1. Special instruction signs
  2. Roadwork signs
  3. Traffic signs
  4. Overhead signs
This is the definition of traffic signs—devices that convey a specific message by words or symbols to regulate, warn, or guide traffic. (Roadwork signs warn of temporary hazards; special instruction signs instruct road users to meet certain requirements.)
$\boxed{\text{Traffic signs}}$