M-Quadtree Index: A Spatial Index Method for Cloud Storage Environment Based on Modified Quadtree Coding Approach
FU Zhongliang, HU Yulong, WENG Baofeng, PENG Rui
Acta Geodaetica et Cartographica Sinica . 2016, (11): 1342 -1351 .  DOI: 10.11947/j.AGCS.2016.20150408