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18-Geom-B1 Digital Terrain Modelling: December 2014

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

  1. Question 1 DTM vs DEM vs DSM
  2. Question 2 Definitions in Digital Terrain Modelling
  3. Question 3 Merits of DEM Data-Generation Methods
  4. Question 4 Drivers of the DEM Sampling Interval
  5. Question 5 Regular Grid vs Irregular (TIN) Data Distribution
  6. Question 6 Steps to Create a TIN
  7. Question 7 DEM for Watershed and Floodplain Boundaries
  8. Question 8 Filtering vs Smoothing
  9. Question 9 Kriging for DEM Interpolation
  10. Question 10 Locating and Eliminating Blunders in a DEM
  11. Question 11 DEMs for Orthophotos and Volume Computation
  12. Question 12 DSM to Rectify Digital Satellite Imagery

Start with Question 1 →

Paper format: National Exams, December 2014 — 3 hours, closed book (any non-communicating calculator permitted). TWELVE numbered questions constitute a complete paper; each is of varying value and the schedule totals 100 marks. Most answers are required in essay format, so clarity and organization are graded. All twelve questions are solved below for completeness.

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); Natural Resources Canada High-Resolution DEM (HRDEM) and CDEM product specifications. Canadian datums throughout (NAD83(CSRS), CGVD2013).

Check / source note. The Question 1 header carries 9 marks but its annotation reads “(3 × 2 marks)” = 6. The header value is authoritative because it is the figure that makes the printed schedule sum to the stated 100 Total marks; the “3 × 2” is a typographic error for 3 × 3. Answers are graded on all three parts of Q1 equally.