In this paper, a method to extract sites that can be constructed a building on university campuses is described. The method uses the vertical direct daylight factor as an index to decide whether a new building can be constructed or not. The sites that can be constructed a building(the constructable site) are calculated for 71 national university campuses. Conventional plans for national universities reveal that the interval between buildings has provided for sufficient distance between buildings. Most campuses were planned so that the density of buildings would be homogeneous on the campuses. As a result, in spite of their low building coverage ratios, these campuses are in the situation where the areas available for development are insufficient in size. For long-term planning of university campuses, it is thus important to clearly establish areas that will, at some stage in the future, be dedicated to the erection of buildings, and other areas where large outdoor spaces are retained with a view to taking advantage of the site effectively while maintaining a certain level of environmental quality.When zoning plans such as these are about to be implemented, the methods developed in this paper can be utilized as an effective tool for planning campuses.
