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UNCERTAINTY IN GEOMORPHOMETRY
by
Thao Thi Minh Nguyen
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(GEOGRAPHY)
May 2011
Copyright 2011
Thao Thi Minh Nguyen
Object Description
| Title | Uncertainty in geomorphometry |
| Author | Nguyen, Thao Thi Minh |
| Author email | thaotngu@usc.edu; tn52@le.ac.uk |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Geography |
| School | College of Letters, Arts and Sciences |
| Date defended/completed | 2011-02-11 |
| Date submitted | 2011 |
| Restricted until | Unrestricted |
| Date published | 2011-02-15 |
| Advisor (committee chair) | Wilson, John |
| Advisor (committee member) |
Longcore, Travis Stott, Lowell |
| Abstract | Uncertainty is a very important concept in geomorphometry because it is a key component in quality assessments of any scientific study that utilizes topographic information. Uncertainty exists at all analysis steps of topographic data modeling and analysis including land surface data capture, model generation, preprocessing, and surface analysis and visualization. This study attempted to improve on our understanding of the uncertainties associated with land surface analysis. It focuses on the relative uncertainties caused by differences in the terrain techniques that are adopted by considering the consequences of choosing different flow routing algorithms, hydrological extraction methods, and terrain model parameters such as grid resolution, flow time, and soil properties using both synthetic constructed and real surfaces. The study found that model uncertainties in geomorphometry are significant and should be taken into account in studies that use the primary and secondary terrain attributes extracted from these terrain models. The findings suggest that an automated system to quantify geomorphometric uncertainties should be incorporated in all terrain analysis model workflows. |
| Keyword | terrain analysis; uncertainty; flow routing algorithms; quasi-dynamic topographic wetness index; hydrological feature extraction |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m3659 |
| Rights | Nguyen, Thao Thi Minh |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Nguyen-4361 |
| Archival file | uscthesesreloadpub_Volume40/etd-Nguyen-4361.pdf |
Description
| Title | Page 1 |
| Full text | UNCERTAINTY IN GEOMORPHOMETRY by Thao Thi Minh Nguyen A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (GEOGRAPHY) May 2011 Copyright 2011 Thao Thi Minh Nguyen |
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