Abstract: Wireless Sensor Network consist of number of nodes that are spatially distributed and deployed in area where we want control on physical or environmental condition such as in military, disaster management and in automated warehouses. Manually configuration of nodes is difficult in case of crowded environment. In order to get the location of nodes in wireless sensor network we use localization technique. There are mainly two technique used in wireless sensor network, first is range free and second is range based. Range free technique based on relatedness between nodes and topological information of nodes while in case of range based technique we calculates distance between nodes. In this paper we will do a review different localization schemes and make a comparison for different application.
Keywords: Localization, Wireless sensor network, range based methods, range free approach, anchor nodes.