Each cell is uniquely identified by a 64-bit S2CellId.The S2 cells are numbered in a special way in order to maximizelocality ofreferencewhenthey are … 展开

The S2CellId class is a thin wrapper overthe 64-bit S2CellId number that provides methods fornavigating the cell hierarchy (finding parents, children, containment tests,etc). Since leaf cells are often used to represent points on the unit sphere,the S2CellId class … 展开

An S2CellUnion is an S2Regionconsisting of cells of various sizes. A cellunion is typically used to approximate some other shape. There is a tradeoffbetween the accuracy of the approximation and how many cells are used. Unlikepolygons, cells have a fixed hierarchical … 展开

An S2Cell is an S2Region object that represents a cell. Unlike S2CellId,it views a cell as a representing a spherical quadrilateral rather than a … 展开

An S2RegionCoverer is a class that allows arbitrary regions to be approximatedas unions of cells (S2CellUnion). This is useful for implementing … 展开