Generally, spatial objects (e.g., Hotels) not only have spatial locations but also have quality attributes (e.g., star, price etc). In wild animal rehabilitation, an appropriate location is selected from a set of options for returning an animal to the nature, after its treatment in a rehabilitation center. A location is preferred if it is far away from (competing) animals with multiple better abilities (e.g., speed, weight, age). Since those animals are much stronger in fighting for essential resources, e.g., water and food, they will endanger the rehabilitated animal that is still unaccustomed to wildlife. By maximizing the distances to potential nearest dominators (NDs), the preferred location improves the survival chance of the rehabilitated animal in the nature. Hence the safe zone is created to retrieve result within the region. If the query moves from the safe zone another safe zone is created fot that query, the intersected part are purned. These reduce the database storage.