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18-Geom-B1 Digital Terrain Modelling: December 2016

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

  1. Question 1 Primary Use of the DTM, DEM and DSM
  2. Question 2 Definitions in Digital Terrain Modelling
  3. Question 3 Drivers of the DEM Sampling Interval
  4. Question 4 Merits of DEM Data-Generation Methods
  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 2016 — 3 hours, closed book (an approved Casio or Sharp calculator permitted). TWELVE numbered questions constitute a complete paper; each carries the margin value shown 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).

Note: this December 2016 paper is the same twelve-question essay set as the December 2014 and December 2015 04-Geom-B1 exams, in a slightly different order (here Q1 asks the primary use of the DTM/DEM/DSM, Q2 the five definitions, Q3 the sampling-interval drivers). The margin marks are internally consistent this year — every sub-part annotation matches its header weight and the schedule sums to 100.