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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/13046

Title: Analytical methods for error propagation in planar space-time prisms
Authors: Kobayashi, Tetsuo
Miller, Harvey J.
OTHMAN, Walied
Issue Date: 2011
Publisher: SPRINGER HEIDELBERG
Citation: JOURNAL OF GEOGRAPHICAL SYSTEMS, 13(4), p. 327-354
Abstract: The space-time prism demarcates all locations in space-time that a mobile object or person can occupy during an episode of potential or unobserved movement. The prism is central to time geography as a measure of potential mobility and to mobile object databases as a measure of location possibilities given sampling error. This paper develops an analytical approach to assessing error propagation in space-time prisms and prism-prism intersections. We analyze the geometry of the prisms to derive a core set of geometric problems involving the intersection of circles and ellipses. Analytical error propagation techniques such as the Taylor linearization method based on the first-order partial derivatives are not available since explicit functions describing the intersections and their derivatives are unwieldy. However, since we have implicit functions describing prism geometry, we modify this approach using an implicit function theorem that provides the required first-order partials without the explicit expressions. We describe the general method as well as details for the two spatial dimensions case and provide example calculations.
Notes: Miller, HJ (reprint author)[Kobayashi, Tetsuo; Miller, Harvey J.] Univ Utah, Dept Geog, Salt Lake City, UT 84112 USA. [Othman, Walied] Hasselt Univ, Dept WNI, Theoret Comp Sci Grp, B-3590 Diepenbeek, Belgium. harvey.miller@geog.utah.edu
URI: http://hdl.handle.net/1942/13046
DOI: 10.1007/s10109-010-0139-z
ISI #: 000297121500001
ISSN: 1435-5930
Category: A1
Type: Journal Contribution
Validation: ecoom, 2012
Appears in Collections: Research publications

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