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18-Geom-B1 Digital Terrain Modelling: December 2017

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 DEM Data Models and Their Comparison
  2. Question 2 Merits of DEM Data-Generation Methods
  3. Question 3 Terrain Sampling Process and a Sampling Method
  4. Question 4 Slope and Aspect from a Gridded DEM
  5. Question 5 Line-of-Sight Visibility Analysis
  6. Question 6 Open-Pit Volume from Cross-Sectional Areas
  7. Question 7 Airborne Lidar — Principle and Returns
  8. Question 8 Gridding and Moving-Average Gridding
  9. Question 9 Delaunay Triangulation and the Voronoi Diagram
  10. Question 10 Flow Directions, Flow Lines and Watershed from a DEM
  11. Question 11 Surface Interpolation and Classification of Methods
  12. Question 12 Kriging — Method and Parameters

Start with Question 1 →

Paper format: National Exams, December 2017 — 3 hours, closed book (one approved Casio or Sharp calculator permitted). The schedule prints TWELVE questions and states that "10 questions constitute a complete paper": Part A (Q1–Q8) is compulsory, Part B requires ONE of Q9–Q10, and Part C requires ONE of Q11–Q12, for a 100-mark paper. All twelve questions are solved below for completeness (a candidate would answer only Q1–Q8 plus one from each of Parts B and C).

Reference texts: Li, Zhu & Gold, Digital Terrain Modeling — Principles and Methodology (CRC Press, 2005); Maune (ed.), Digital Elevation Model Technologies and Applications: The DEM Users Manual (2nd ed., ASPRS, 2007); Wilson & Gallant, Terrain Analysis — Principles and Applications (Wiley, 2000); Wolf, Dewitt & Wilkinson, Elements of Photogrammetry with Applications in GIS (4th ed., McGraw-Hill, 2014); Isaaks & Srivastava, An Introduction to Applied Geostatistics (Oxford, 1989). Canadian datums throughout (NAD83(CSRS), CGVD2013).