1. A method, comprising: identifying, from an index structure stored in memory, a reference minimum bounding shape that encloses at least one minimum bounding shape, each of the at least one minimum bounding shape corresponding to a data object associated with a leaf node of the index structure; and associating, using one or more processors, coordinates of a point of the at least one minimum bounding shape with a set of first values to produce a relative representation of the at least one minimum bounding shape, the set of first values being calculated relative to coordinates of a reference point of the reference minimum bounding shape such that each first value comprises a first number of significant bits fewer than a second number of significant bits representing a second value associated with a corresponding one of absolute coordinates of the point.