Evaluation On Construction Land Of Shijiazhuang Based On GIS

Nowadays, we use more qualitative methods of analysis to evaluate China’surban construction land suitability, with greater subjectivity. Using powerful spatialdata analysis capabilities of GIS, and fully taking the advantages of the two types ofevaluation methods as AHP and rough set theory, we can establish comprehensiveevaluation index of influencing factors of the suitability of the engineeringgeological conditions. Then combining the subjective weights determined by AHPwith objective weight determined by rough set theory takes shape of combinedweights. This can make the evaluation more objective and improve the accuracy of it.Besides, combining of fuzzy comprehensive evaluation method to determine thesuitability of urban construction land.Based on the depth of the foundation in the different form,divided study area’sconstruction land into natural foundation bearing stratum (less than5m), compositefoundation bearing layer (5-8m,8-15m) and pile bearing stratum (15-20m20-25m,25-30m,30-65m), were evaluated respectively, and the study area wasdivided into the most suitable areas, more suitable area, poor suitable areas and theworst suitable area. After the evaluation concluded that in addition to the Hutuo riverrange of20m around the extent of built-up areas, the natural foundation suitabilitypartition from good to poor percentage were70%,15%,15%,0%;5-8m compositefoundation were50%,30%,20%,0%;8-15m composite foundation suitabilitypartition were70%,20%,10%,0%;15-20m pile suitable partition followed by90%,5%,5%,0%;20-25m pile suitability partition were95%,5%,0%,0%;25-30m,30-65m pile are suitable; with the results of the evaluation of Shijiazhuang,providing strong scientific basis to the urban planning in the future.