A solution is provided in which regions are formed incrementally as points are added to a database. Each time a point is added to the database, it may be assigned to a new region. This new region may then be compared against each of the current set of regions until one is found with which it can be successfully merged. Then, this newly merged region may be compared against each of the other regions until one is found with which it can be successfully merged. This process repeats until there are no more regions that can be merged. Determining whether or not a region can be merged with another region may involve determining whether or not the points in one region differ from the points in the other region only along one dimension. If so, then the point can be successfully merged with the region.