The barrier-free of identifiability in urban night-oriented systems

"Urban night-oriented systems" is an important component of the urban environment-oriented identification system and an expansion in time for the daily urban space guiding and identifiability. The research on the space image at the same place with different time can improve the level of understanding of urban space. And the research on the problem of the barrier-free of identifiability at night is more helpful to comprehention of the extreme circumstances and benefit to analyse general phenomenon for the action and identifiability. There are some differences in the ability to identify between day and night that affect the way and the night security of behavior. This paper analyzes the characteristics of the manifold elements and the identify ways which having oriented function for the action at night, and provides the theoretical basis for the further research of urban night-oriented systems.