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Modeling Accessibility through Geocrowdsourcing

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dc.contributor.advisor Rice, Matthew T
dc.contributor.author Qin, Han
dc.creator Qin, Han
dc.date 2017-01-18
dc.date.accessioned 2019-04-25T18:00:21Z
dc.date.available 2019-04-25T18:00:21Z
dc.identifier.uri https://hdl.handle.net/1920/11418
dc.description.abstract Map-based crowdsourcing is one of the most significant contemporary trends in the geospatial sciences and has completely changed many data collection workflows, and added new sources of data. An important aspect of this emerging trend is the manner in which data quality is assessed, and how well these quality assessment processes match processes used in traditional map-based and geographic information systems-based quality assessment procedures. This dissertation studies the evolution of geographic data collection, and the methods of quality assessment, and builds a comprehensive quality assessment workflow for geocrowdsourced data. This workflow is based on many traditional formulations of quality, such as positional accuracy, temporal consistency, categorical accuracy, fitness-for-use, and lineage. These quality assessment workflows are studied through the George Mason University Geocrowdsourcing Testbed (GMU-GcT), which was designed to study dynamic aspects of map-based crowdsourcing. The GMU-GcT tests the implementation of techniques from the US National Map Accuracy Standard (NMAS) as well as the National Standard for Spatial Data Accuracy (NSSDA), as well as several new techniques, modified over time, that are shown to have value within the specific context of geocrowdsourcing conducted with the GMU-GcT. This research extends the quality assessment work with modeling of a pedestrian network and the accessibility characteristics associated with navigation obstacles, many of which have been crowdsourced with the GMU-GcT, and tests the feasibility of infrastructure maintenance using geocrowdsourced data and associated quality assessment parameters. The quality assessment techniques from traditional mapping domains are shown to have value in the domain of geocrowdsourcing, and the ability to model pedestrian network accessibility and maintenance optimization is demonstrated through this work. Extensions of this research into geosocial media is explored with mixed results, and future work in simplified, image-based geocrowdsourcing is explored to determine what quality assessment metrics can be derived from greatly simplified geocrowdsourcing methods. Additional modeling enhancements, based on alternative optimization strategies and weighting factors, is discussed as a future area for work. Summary of end-user and subject matter experts is discussed in context of future modifications to the GMU-GcT.
dc.language.iso en en_US
dc.subject Accessibility en_US
dc.subject Data Quality en_US
dc.subject Geocrowdsourcing en_US
dc.subject Optimization Modeling en_US
dc.title Modeling Accessibility through Geocrowdsourcing en_US
dc.type Dissertation en_US
thesis.degree.name Doctor of Philosophy in Earth Systems and Geoinformation Sciences en_US
thesis.degree.level Doctoral en_US
thesis.degree.discipline Earth Systems and Geoinformation Sciences en_US
thesis.degree.grantor George Mason University en_US


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