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Social and Behavioral Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Geography

2009

Geographic information systems

Electronic Theses and Dissertations

Articles 1 - 3 of 3

Full-Text Articles in Social and Behavioral Sciences

Support Vector Methods For Higher-Level Event Extraction In Point Data, Jon Devine Aug 2009

Support Vector Methods For Higher-Level Event Extraction In Point Data, Jon Devine

Electronic Theses and Dissertations

Phenomena occur both in space and time. Correspondingly, ability to model spatiotemporal behavior translates into ability to model phenomena as they occur in reality. Given the complexity inherent when integrating spatial and temporal dimensions, however, the establishment of computational methods for spatiotemporal analysis has proven relatively elusive. Nonetheless, one method, the spatiotemporal helix, has emerged from the field of video processing. Designed to efficiently summarize and query the deformation and movement of spatiotemporal events, the spatiotemporal helix has been demonstrated as capable of describing and differentiating the evolution of hurricanes from sequences of images. Being derived from image data, the …


Specifying And Detecting Topological Changes To An Areal Object, Jixiang Jiang Aug 2009

Specifying And Detecting Topological Changes To An Areal Object, Jixiang Jiang

Electronic Theses and Dissertations

No abstract provided.


An Embedding Graph For 9-Intersection Topological Spatial Relations, Matthew P. Dube May 2009

An Embedding Graph For 9-Intersection Topological Spatial Relations, Matthew P. Dube

Electronic Theses and Dissertations

In the practice of mapmaking, it is commonplace to represent many spatial phenomena as if they were in a different dimension than they truly are. In this context, it is extremely important to understand the total set of relationships available in a two-dimensional setting. Currently, there exist many sets of relations in two dimensions that have been modeled by the 9-intersection matrix. Many of these sets of relations have defined conceptual neighborhood graphs that show the inherent topological similarities between different types of configurations. Many of these sets of relations, however, do not have established conceptual neighborhood graphs. Furthermore, …