A description of Quadkeys would be great here too.
The quadkey can be thought of as a representation of the route to a point, i.e each time a rectangle is divided, each of its quadrants is assigned a letter A-D (or number 0-3) and the quad key for a point is the concatenation of those labels from the top of the tree down to (typically) an arbitrary depth.
If a quadkey is then used as an indexed field in a database, the question "All the points in a specific quadrant" is simply a prefix search
A description of Quadkeys would be great here too.
The quadkey can be thought of as a representation of the route to a point, i.e each time a rectangle is divided, each of its quadrants is assigned a letter A-D (or number 0-3) and the quad key for a point is the concatenation of those labels from the top of the tree down to (typically) an arbitrary depth.
If a quadkey is then used as an indexed field in a database, the question "All the points in a specific quadrant" is simply a prefix search