Land allocation based on integrated GIS-optimization modeling at a watershed level

Results of a watershed optimization model that specifies the future amount of land for each land use type at a sub-area level are incorporated into a GIS-based spatial allocation model to provide specific location recommendations based on existing land use, slope, distance to surface water and conversion preference. Thus, more detailed interpretation and implementation of optimal development scenarios can be obtained. This integrated approach was applied in Lake Erhai basin, China. This prototype land allocation system combines the strength of optimization modeling and GIS. A decision maker knows where and what type of land use changes should be made to achieve an environmental and economic sustainable future. That is, the modeling results provide support for answering questions of “what should I do?” and “how do I do it?” in land use planning and decision-making.