Location-based services are the services offered to users based on their locations. Location-based services have many diverse applications like finding the nearest stores in a particular area, location-based advertisement, analysing wildlife and traffic movements, location-based gaming etc. The advancements in database and mobile technology and rapidly increasing popularity of location-based services results in huge amounts of data being collected in databases. Location-based services have attracted significant attention from the industrial and research community. The most common type of query performed on location-based server is Nearest Neighbour query. An example of a Nearest Neighbour query is a person trying to find the nearest pizza store or a soldier finding the nearest enemy troop. Another type of query gaining popularity nowadays is Reverse Nearest Neighbour query. Reverse Nearest Neighbour queries are of two types: monochromatic and bichromatic. In monochromatic RkNN, both query point and database objects are of the same type, while in bichromatic RkNN both are of different types. R kNN query finds applications in decision support systems where the task is to open a new facility like restaurant in an area such that it will be least in uenced by its competitors and attract good business. The rapid increase in popularity of location-based services have resulted in huge amount of spatial textual data being generated. The location-based services offer convenience but threaten the location and query privacy of the user. The data collected by such servers can be to used study user behaviour or for stalking personal locations. In this project the system propose the Spatio-Text Inverter Algorithm.