Date Added: Jan 2013
WSN is used in many recent trends in wireless application, where its nodes needed to localize him before sending any data. Nodes are defines their coordinates in localization process, through coordinates they localize himself. There are various algorithm proposed in localization based on 2D works on two plane, it provides accuracy but in real world needed all three planes for correct estimation and more accuracy in localization. The 2D works on flat terrain, the authors need to deploy WSN in harsh terrain also, so, they needed to define algorithm on 3D basis for providing better accuracy and decrease the error of estimation and it provide a real world view. This paper works on localization of node using 3D and its algorithm.