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GIS Software for Measuring Space-Time Accessibility in Transportation Planning and Analysis (2000)

Miller, Harvey J. ; Wu, Yi-Hwa

Springer

Geoinformatica 4 (2000), S. 141-159

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ISSN: 1573-7624

Keywords: transportation ; accessibility ; space-time ; user interfaces ; GIS design

Source: Springer Online Journal Archives 1860-2000

Topics: Geography

Notes: Abstract Transportation systems exist to improve individual accessibility. However, emerging applications of GIS in transportation (GIS-T) and intelligent transportation system (ITS) focus on throughput (the amount of system flow) rather than accessibility. Throughput is related but not equivalent to accessibility. Sensitive transportation planning requires rigorous, realistic and tractable accessibility measures. This paper reports on the development of GIS software that implement space-time accessibility measures (STAMs). The STAMs reflect the benefits that individuals receive from the transportation system. They are easily interpreted, particularly with respect to changes in accessibility. The STAMs also consider the locations and travel velocities dictated by the transportation system as well as individuals’ daily activity schedules. Tractable computational procedures allow calculation of the STAMs for detailed, urban-scale transportation networks. A prototype ArcInfo®-linked software system that runs on Windows NT® or Sun Solaris® platform implements the STAMs with user-friendly interfaces and project management tools.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009820006075

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Electronic Resource

Three-dimensional free-surface suspended particles transport in the South Biscayne Bay, Florida (1984)

Miller, Harvey P.

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 4 (1984), S. 901-914

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ISSN: 0271-2091

Keywords: Hydrodynamic Model ; Suspended Particles Transport ; Free-surface Model ; Bottom Bed Deposition ; Particle Settling Velocity ; Particulate Dispersion ; Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: A three-dimensional, time-dependent free surface model has been developed which takes account of topographical and meterological parameters for application to suspended particles transport. This investigation of suspended particles transport is the most realistic in regard to treating the moving free-surface in computing the hydrodynamic field. A unique mass-conserving numerical model is used for solving the concentration equation by an explicit finite difference scheme. The paper presents a mathematical model which can be applied to surface water dispersion of particulates associated with dredging operations and land-fill. The effects of settling velocity and bottom bed deposition rate are compared and discussed.

Additional Material: 7 Ill.