The ecological security assessment of earthquake-stricken area based on RS and GIS technology-take the city of Dujiangyan as example

摘要

Firstly, based on the theory of ecological security assessment, the thesis set up ecological security assessment index system of Dujiangyan after the earthquake according to DPSIR (driving force - pressure - state - impact - response) model. Then combining the actual situation of Dujiangyan after the earthquake, it has accomplished information extraction of various factor in assessment index system and has carried on synthetic evaluation by using the compound evaluation model(AHP-composite index model-histogram image segmentation method) with the support of RS and GIS technology. After validating the precision of result that superimposed with the potential geological disasters measured after the earthquake, the consequence showed that the entire ecological security level of Dujiangyan is a bit lower than general standard. When we reconstruct after the earthquake. We should choose higher ecological security regions to layout, in accordance with the principles of easier part first and establish new to drive the old.