1. [1] I. Heywood, S. Cornelius, S. Carver, “Geographical Information Systems,” Pearson Education Limited, 2006.
2. [2] Y. Nishida, H. Aizawa, T. Hori, N.H. Hoffman, T. Kanade, and M. Kakikura, “3D Ultrasonic Tagging System for Observing Human Activity,” in Proceedings of IEEE International Conference on Intelligent Robots and Systems (IROS2003), pp.785-791, 2003.
3. [3] N. Cressie, “Statistics for Spatial Data (Revised Edition ed.),” John Wiley & Sons, Inc, 1993.
4. [4] D. Stoyan, W. Kendall, J. Mecke, “Stochastic Geometry and Its Applications (2nd ed.),” John Wiley & Sons, Inc, 1996.
5. [5] 松野 敬子,山本恵梨,“遊具事故防止マニュアル,” かもがわ出版,2006.