1. Facebook Connectivity Lab, Center for International Earth Science Information Network - CIESIN - Columbia University 2016. High Resolution Settlement Layer (HRSL). Source imagery for HRSL $$\copyright $$ 2016 DigitalGlobe. http://www.ciesin.columbia.edu/data/hrsl/ . Accessed 01 Mar 2017
2. Agarwal, P.K., Erickson, J., et al.: Geometric range searching and its relatives. Contemp. Math. 223, 1–56 (1999)
3. Lecture Notes in Computer Science;F Bengtsson,2004
4. Chan, C.Y., Ioannidis, Y.E.: Hierarchical prefix cubes for range-sum queries. In: VLDB, pp. 675–686 (1999)
5. Chazelle, B.: Filtering search: a new approach to query-answering. SIAM J. Comput. 15(3), 703–724 (1986)