on the basis of pca, the classification of areal is given by means of group-average method, nearest-neigbour method and furthest-neighbour method in system clustering and fuzzy graph theory method.
在主分量分析的基础上,用系统聚类的类平均法、最短距离法和最长距离法以及模糊图论聚类法对山楂分布区进行数量分类研究。