轴线熵计算轴线图的熵值。从某条轴线到其他轴线的拓扑深度序列，而非拓扑深度本身，去计算轴线的分布。参见熵的计算。
轴线熵
Sources
Turner, A. (2004), DepthMap4: A Researcher’s Handbook, UCL. pp. 15;
Tuner, A. (2001) Angular Analysis, 3rd International Symposium on Space Syntax, Georgia Institute of Technology, 7-11 May 2011. pp.8