Wireless sensor network is a heterogeneous system combining many number of inexpensive sensor nodes with distinguishing characteristics. Sensors' locations play a major role in many sensor network applications. If the sensor launched in unfriendly environment it may meet certain attacks, and the sensor's location is not trustable. The previous scheme contains two sub algorithms namely, Greedy Filtering using Matrix (GFM) and Greedy Filtering using Trustability-indicator (GFT). Both algorithms detect the abnormal locations. It would not be use in the low-cost sensor networks.