18-Geom-B1 Digital Terrain Modelling
Worked solutions to 4 past sittings (2014–2017), 48 questions. Pick a sitting, or start from a topic below.
Topics across the sittings
Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.
- Merits of DEM Data-Generation Methods (4 sittings): December 2017 Q2 · December 2016 Q4 · December 2015 Q4 · December 2014 Q3
- Definitions in Digital Terrain Modelling (3 sittings): December 2016 Q2 · December 2015 Q3 · December 2014 Q2
- DEM for Watershed (3 sittings): December 2016 Q7 · December 2015 Q7 · December 2014 Q7
- DEMs for Orthophotos (3 sittings): December 2016 Q11 · December 2015 Q11 · December 2014 Q11
- Eliminating Blunders in a DEM (3 sittings): December 2016 Q10 · December 2015 Q10 · December 2014 Q10
- Filtering (3 sittings): December 2016 Q8 · December 2015 Q8 · December 2014 Q8
- Floodplain Boundaries (3 sittings): December 2016 Q7 · December 2015 Q7 · December 2014 Q7
- Irregular Data Distribution (3 sittings): December 2016 Q5 · December 2015 Q5 · December 2014 Q5
- Kriging for DEM Interpolation (3 sittings): December 2016 Q9 · December 2015 Q9 · December 2014 Q9
- Locating (3 sittings): December 2016 Q10 · December 2015 Q10 · December 2014 Q10
- Regular Grid (3 sittings): December 2016 Q5 · December 2015 Q5 · December 2014 Q5
- Smoothing (3 sittings): December 2016 Q8 · December 2015 Q8 · December 2014 Q8
- Steps to Create a TIN (3 sittings): December 2016 Q6 · December 2015 Q6 · December 2014 Q6
- Volume Computation (3 sittings): December 2016 Q11 · December 2015 Q11 · December 2014 Q11
Questions by sitting
December 2017
- Question 1: DEM Data Models and Their Comparison
- Question 2: Merits of DEM Data-Generation Methods
- Question 3: Terrain Sampling Process and a Sampling Method
- Question 4: Slope and Aspect from a Gridded DEM
- Question 5: Line-of-Sight Visibility Analysis
- Question 6: Open-Pit Volume from Cross-Sectional Areas
- Question 7: Airborne Lidar — Principle and Returns
- Question 8: Gridding and Moving-Average Gridding
- Question 9: Delaunay Triangulation and the Voronoi Diagram
- Question 10: Flow Directions, Flow Lines and Watershed from a DEM
- Question 11: Surface Interpolation and Classification of Methods
- Question 12: Kriging — Method and Parameters
December 2016
- Question 1: Primary Use of the DTM, DEM and DSM
- Question 2: Definitions in Digital Terrain Modelling
- Question 3: Drivers of the DEM Sampling Interval
- Question 4: Merits of DEM Data-Generation Methods
- Question 5: Regular Grid vs Irregular (TIN) Data Distribution
- Question 6: Steps to Create a TIN
- Question 7: DEM for Watershed and Floodplain Boundaries
- Question 8: Filtering vs Smoothing
- Question 9: Kriging for DEM Interpolation
- Question 10: Locating and Eliminating Blunders in a DEM
- Question 11: DEMs for Orthophotos and Volume Computation
- Question 12: DSM to Rectify Digital Satellite Imagery
December 2015
- Question 1: Drivers of the DEM Sampling Interval
- Question 2: DTM vs DEM vs DSM
- Question 3: Definitions in Digital Terrain Modelling
- Question 4: Merits of DEM Data-Generation Methods
- Question 5: Regular Grid vs Irregular (TIN) Data Distribution
- Question 6: Steps to Create a TIN
- Question 7: DEM for Watershed and Floodplain Boundaries
- Question 8: Filtering vs Smoothing
- Question 9: Kriging for DEM Interpolation
- Question 10: Locating and Eliminating Blunders in a DEM
- Question 11: DEMs for Orthophotos and Volume Computation
- Question 12: DSM to Rectify Digital Satellite Imagery
December 2014
- Question 1: DTM vs DEM vs DSM
- Question 2: Definitions in Digital Terrain Modelling
- Question 3: Merits of DEM Data-Generation Methods
- Question 4: Drivers of the DEM Sampling Interval
- Question 5: Regular Grid vs Irregular (TIN) Data Distribution
- Question 6: Steps to Create a TIN
- Question 7: DEM for Watershed and Floodplain Boundaries
- Question 8: Filtering vs Smoothing
- Question 9: Kriging for DEM Interpolation
- Question 10: Locating and Eliminating Blunders in a DEM
- Question 11: DEMs for Orthophotos and Volume Computation
- Question 12: DSM to Rectify Digital Satellite Imagery