Application of principal component analysis and cluster analysis to evaluating ecological safety of land use

Land resources is depending capital of human existence, therefore, more and more problems of ecological safety in land utilization are concerned. Principal component analysis and cluster analysis were used in appraising and classifying ecological safety in land utilization. The author established firstly the index system of ecological safety assessment in land utilization, then applied principal component analysis to eliminate the indexes having the relativities and overlap information. The representative indexes from principal component analysis process substitute for the primary indexes. And then cluster analysis method was used to analyze ecological safety in land utilization. The conclusion is objective, and it can provide reference to ecological safety.