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An Analysis of DEM Generalization Techniques for Hydrological Flow Path Modelling

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dc.contributor.advisor Lindsay, John Francioni, Anthony 2019-07-11T13:15:48Z 2019-06 2019-06-21 2019-07-11
dc.description.abstract Advancements in elevation sampling platforms allow for the creation of fine-resolution DEMs that faithfully capture microtopography. However, fine-resolution DEMs are severely impacted by small-scale surface roughness, which is commonly removed during a DEM generalization pre-processing step. This research sought to investigate and develop a DEM generalization technique that removes surface roughness while preserving microtopography. Specifically, preserving microtopographic drainage features such as gullies, culverts, and tributaries are particularly important for hydrological flow-path modelling applications. Two feature-preserving smoothing techniques were developed and compared against common low-pass filter-based smoothing techniques to evaluate smoothing performance and processing efficiency. Using scale signatures, the drainage preserving smoothing (DPS) algorithm effectively removed surface roughness and accurately preserved microtopographic drainage features demonstrated through lower RMSD and LE90 (0.0444 and 0.0582 for Rondeau Bay) values compared to low-pass filtering techniques. Although DPS has an associated performance penalty, feature-preserving techniques documented higher quality smoothing and are practical DEM generalization techniques. en_US
dc.description.sponsorship NSERC Discovery Grant 401107 en_US
dc.language.iso en en_US
dc.rights Attribution-NoDerivatives 4.0 International *
dc.rights.uri *
dc.subject Geomorphometry en_US
dc.subject LiDAR en_US
dc.subject Fine resolution DEM en_US
dc.subject Surface roughness en_US
dc.subject Surface complexity en_US
dc.subject Microtopography en_US
dc.subject Drainage features en_US
dc.subject Feature preservation en_US
dc.subject Generalization en_US
dc.subject Smoothing en_US
dc.subject Edge-preserving filter en_US
dc.subject Normal vector filtering en_US
dc.subject Scale signature en_US
dc.subject Hydrological flow-path modelling en_US
dc.title An Analysis of DEM Generalization Techniques for Hydrological Flow Path Modelling en_US
dc.type Thesis en_US Geography en_US Master of Science en_US Department of Geography, Environment and Geomatics en_US
dc.description.embargo 2019-11-01
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Attribution-NoDerivatives 4.0 International Except where otherwise noted, this item's license is described as Attribution-NoDerivatives 4.0 International