Optimal Spatial Interaction and the Gravity Model

Optimal Spatial Interaction and the Gravity Model
Author :
Publisher : Springer
Total Pages : 134
Release :
ISBN-10 : UCAL:B4392889
ISBN-13 :
Rating : 4/5 (89 Downloads)

Book Synopsis Optimal Spatial Interaction and the Gravity Model by : Sven Erlander

Download or read book Optimal Spatial Interaction and the Gravity Model written by Sven Erlander and published by Springer. This book was released on 1980-02 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has grown out of a desire to explore the possibilities of using optimizing models in transportation planning. This approach has been followed throughout. Models which combine descriptive and optimizing elements are not treated. The gravity model is here studied as the solution to an optimizing model. In spite of this approach, much of the material shoula be of general interest. Algorithms are not discussed. The author has benefited from discussions with many colleagues. M. Florian suggested the term "interacti vi ty". N.F. Stewart and P. Smeds gave many valuƯ able comments on a first draft. M. Beckmann made me think once more about the final chapters. R. Grubbstrem and K. Jornsten helped clarifYing some things in the same chapters. Remaining insufficiencies are due to the author. Gun Mannervik typed with great patience. Linkoping in October 1979 Sven Erlander ABSTRACT The book proposes extended use of optimizing models in transportation plannƯ ing. An entropy constrained linear program for the trip distribution problem is formulated and shown to have the ordinarJ doubly constrained gravity model as its solution. Entropy is here used as a measure of interactivity, which is constrained to be at a prescribed level. In this way the variation present in the reference trip matrix is preserved. (The properties of entropy as a dispersion measure are shortly discussed.) The detailed mathematics of the optimal solutions as well as of sensitivity and duality are given.


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