Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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    THE QUEST FOR I-LITERACY: IDENTIFYING AND ADDRESSING GAPS IN INFORMATION LITERACY EDUCATION IN INFORMATION SCIENCE UNDERGRADUATE PROGRAMS
    (2022) Douglass, Courtney L.; Jaeger, Paul; Library & Information Services; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Information scholars, educators and librarians have grappled with defining the concept of information literacy for decades – at least as far back as the 1970’s – with the most prominent common thread being as a set of skills. In pedagogy and practice, what higher education currently calls information literacy is delivered more akin to research skills or the ability to effectively conduct and share research in its myriad forms. It is problematic that for so long the emphasis on research and academic skills has wholly devalued those sources deemed non-traditional by academic measures, including popular sources, pop-culture entertainment, and the power of observation. Ironically this emphasis on academic research skills diminishes the extreme societal impact non-traditional sources and stories have had throughout the information age in which we currently find ourselves. In this dissertation, I provide a curriculum map for the required courses in five Undergraduate Information Science Programs, with the dual purpose of aligning instruction practices and gaps with the aforementioned impacts as they determine what information literacy should mean, and encouraging iSchools to adopt and promote a socially constructed model of information literacy, which I am terming i-Literacy. This study demonstrates how iSchool undergraduate programs emphasize understanding that different information mediums are required based on audience, user needs, and the information problem, but may not highlight social and civic responsibility with information use and sharing. The map also shows a strong alignment between the seemingly antiquated ‘Bibliographic Instruction’ practices from the 1980’s and 90’s, and the current pedagogy based on the ACRL Framework.
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    Characterizing tree species diversity in the tropics using full-waveform lidar data
    (2019) Marselis, Suzanne; Dubayah, Ralph; Geography; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Tree species diversity is of paramount value to maintain forest health and to ensure that forests are able to provide all vital functions, such as creating oxygen, that are needed for mankind to survive. Most of the world’s tree species grow in the tropical region, but many of them are threatened with extinction due to increasing natural and human-induced pressures on the environment. Mapping tree species diversity in the tropics is of high importance to enable effective conservation management of these highly diverse forests. This dissertation explores a new approach to mapping tree species diversity by using information on the vertical canopy structure derived from full-waveform lidar data. This approach is of particular interest in light of the recently launched Global Ecosystem Dynamics Investigation (GEDI), a full-waveform spaceborne lidar. First, successful derivation of vertical canopy structure metrics is ensured by comparing canopy profiles from airborne lidar data to those from terrestrial lidar. Then, the airborne canopy profiles were used to map five successional vegetation types in Lopé National Park in Gabon, Africa. Second, the relationship between vertical canopy structure and tree species richness was evaluated across four study sites in Gabon, which enabled mapping of tree species richness using canopy structure information from full-waveform lidar. Third, the relationship between canopy structure and tree species richness across the tropics was established using field and lidar data collected in 16 study sites across the tropics. Finally, it was evaluated how the methods and applications developed here could be adapted and used for mapping pan-tropical tree species diversity using future GEDI lidar data products.
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    Novel Applications in Wetland Soils Mapping on the Delmarva Coastal Plain
    (2018) Goldman, Margaret Anne; Needelman, Brian A; Environmental Science and Technology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    On the Delmarva Peninsula, depressional wetlands provide a range of ecosystem services, including water purification, groundwater recharge, provision of critical habitat, and carbon storage. Concern for the health of the Chesapeake Bay and the establishment of the Bay Total Maximum Daily Load have led to growing interest in restoring depressional and other wetland types to mitigate agricultural nitrogen inputs. The ability of natural resource managers to implement wetland restoration to address nonpoint source pollution is constrained by limited spatial information on hydrogeologic and soil conditions favoring nitrogen removal. The goal of this study was to explore the potential of new digital soil mapping techniques to improve identification of wetland soils and map soil properties to improve assessment of wetland ecosystem services, including removing excess nitrogen, and inform natural resource decision making. Previous research on digital soil mapping has focused largely on the development of medium to low-resolution general purpose soil maps in areas of heterogeneous topography and geomorphology. This study was unique in its focus on mapping wetland soils to support wetland restoration decisions in a low relief landscape. A digital soil mapping approach involving the spatial disaggregation of soil data map units was used to create maps of natural soil drainage and texture class. The study was conducted in the upper part of the Choptank River Watershed on central Delmarva, where depressional wetlands occur in high densities and historical loss of wetlands is estimated to be high compared to similar Maryland watersheds. The soil disaggregation techniques developed in this study were successful in creating a more refined representation of natural soil drainage and texture class in forested depressional wetlands. Comparison of the disaggregated soils map with recently developed time-series inundation maps of the region demonstrate the need for further research to understand how indicators of historic and current hydrologic conditions can guide operational soils and wetland mapping and inform wetland restoration decisions.
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    Driving Around Los Santos: Space, Place, and Place-making in Grand Theft Auto V
    (2014) Neuner, Alyssa Marie; Farman, Jason; American Studies; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    With the emergence of videogames came an exodus to the digital worlds created within them. To understand this shift is to understand the human needs they have come to fulfill. One of these basic human necessities is having a sense of place. Here Grand Theft Auto V becomes one game in a slew of game titles to foster this need.