Assessment of City Ecological Security Based on Projection Pursuit Model

Assessing and understanding the level of city ecological security are of great importance to sustainable urban development. According to the pressure-state-response model, the indexes of city ecology security assessment were chosen. Subsequently, the assessment model based on projection pursuit technology was set up and used for a case of Hefei city. The result shows that the ecological security level of the city in 2003 belongs to critical security situation. The conclusion is the same to that of matter element model and reflects the real eco-environment state of Hefei city. Therefore, the model is feasible and accurate.