Method of the third rank division of highway in east seasonal frost region

Based on the fuzzy mathematics theory, the zoning idea that the third rank natural division should be made in east seasonal frost region with fuzzy clustering method was put forward. Taking Luyu light frost region (II₅) as example, the target of zoning was abstracted, a proportion vector of the target was made, and a fuzzy similarity matrix was formed. Base on the similarity extent of the general impact of natural factors on the highway engineering, the clustering zoning was made by direct clustering method. Combing the relative analysis of geography, the results of the model zoning were adjusted. Thus the third rank natural division was obtained in Luyu light frost region (II₅).