Journal
ENVIRONMENTAL MODELLING & SOFTWARE
Volume 25, Issue 12, Pages 1582-1591Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envsoft.2010.06.001
Keywords
Sensitivity; Multi-criteria decision-making; AHP; ArcGIS
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Funding
- Cooperative Research Centre for Irrigation Futures (CRC IF), Australia
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With growing interest in extending GIS to support multi-criteria decision-making (MCDM) methods, enhancing GIS-based MCDM with sensitivity analysis (SA) procedures is crucial to understand the model behavior and its limitations. This paper presents a novel approach of examining multi-criteria weight sensitivity of a GIS-based MCDM model. It explores the dependency of model output on the weights of input parameters, identifying criteria that are especially sensitive to weight changes and to show the impacts of changing criteria weights on the model outcomes in spatial dimension. A methodology was developed to perform simulations where the weights associated with all criteria used for suitability modelling were varied one-at-a-time (OAT) to investigate their relative impacts on the final evaluation results. A tool which incorporates the OAT method with the Analytical Hierarchy Process (AHP) within the ArcGIS environment was implemented. It permits a range of user defined simulations to be performed to quantitatively evaluate model dynamic changes, measures the stability of results with respect to the variation of different parameter weights, and displays spatial change dynamics. A case study of irrigated cropland suitability assessment addressing the application of the new GIS-based AHP-SA tool is described. It demonstrates that the tool is spatial, simple and flexible. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.
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