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Spatial multi-objective land use optimization: extensions to the non-dominated sorting genetic algorithm-II

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A spatial multi-objective land use optimization model defined by the acronym ‘NSGA-II-MOLU’ or the ‘non-dominated sorting genetic algorithm-II for multi-objective optimization of land use’ is proposed for searching for optimal land use scenarios which embrace multiple objectives and constraints extracted from the requirements of users, as well as providing support to the land use planning process. In this application, we took the MOLU model which was initially developed to integrate multiple objectives and coupled this with a revised version of the genetic algorithm NSGA-II which is based on specific crossover and mutation operators. The resulting NSGA-II-MOLU model is able to offer the possibility of efficiently searching over tens of thousands of solutions for trade-off sets which define non-dominated plans on the classical Pareto frontier. In this application, we chose the example of Tongzhou New Town, China, to demonstrate how the model could be employed to meet three conflicting objectives based on minimizing conversion costs, maximizing accessibility, and maximizing compatibilities between land uses. Our case study clearly shows the ability of the model to generate diversified land use planning scenarios which form the core of a land use planning support system. It also demonstrates the potential of the model to consider more complicated spatial objectives and variables with open-ended characteristics. The breakthroughs in spatial optimization that this model provides lead directly to other properties of the process in which further efficiencies in the process of optimization, more vivid visualizations, and more interactive planning support are possible. These form directions for future research.

Keywords: China; NSGA-II-MOLU; Tongzhou New Town; land use planning; multi-objective optimization; planning support systems; spatial land use optimization

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/13658816.2011.570269

Affiliations: 1: Center for Geographic Analysis, Harvard University, CambridgeMA, USA 2: Centre for Advanced Spatial Analysis (CASA),University College London, London, UK 3: Department of Geography and Resource Management,The Chinese University of Hong Kong, ShatinN.T., Hong Kong 4: School of Geography, Planning and Environment Management,The University of Queensland, BrisbaneQld., Australia 5: Center for Earth System Science,Tsinghua University, Beijing, PR China 6: Nanjing Institute of Geography & Limnology,Chinese Academy of Sciences, Nanjing, PR China

Publication date: December 1, 2011

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