Evaluation Experiment of the Composite Pictures Made by Combining Images of Chinese Cityscapes and those of Various Green Roofs by the Chinese University Students

Abstract

We made a landscape evaluation experiment by the semantic differential method to clarify the green roof design which is preferable for the Chinese of future Chinese cities. Ten composite pictures were made combining a picture of a modern or a traditional Chinese city landscape that were taken from roof tops of buildings in Chinese cities with a bare roof or four green roof pictures. In the profile analysis, the psychological evaluation values of the images made with a bare-roof resulted in lowest by most of evaluation subjects. The style of the green roof highly affected the evaluation. For example, Chinese styled-roof garden got highest scores by 10 subjects (out of 22 subjects) in combination with the traditional modern city landscape, but only three subjects with the modern. With the factor analysis, the following five evaluation factors were understood as landscape evaluation structures of green roofs in the background of Chinese city landscapes: comfortableness, style and form, Green quality and quantity, openness and harmony. Using the factor score, the effect of various landscape elements on the psychological evaluation of the green roof was examined. As a result, the psychological evaluation rate rose as the green regard rate increased (r = 0.889, p = 0.001) and as the building rate decreased.