凸空间性指空间在二维上延伸的程度，其周边任意一点的切线都不会穿越该空间本身。
凸空间性
Sources
Hillier, B. & Hanson, J. (1984), The Social Logic of Space, Cambridge University Press: Cambridge. pp.91,97;
Hillier, B. , Hanson, J., and Peponis, J. (1987) , Syntactic Analysis of Settlements, Arch. & Comport/Arch. Behav., Vol.3, n.3, 217-231. pp.222.