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However, these networks are prone to cause interference to neighbor networks, such as data duplication or interception. How to detect, determine, and locate the unknown wireless topologies in a given geographical area has become a significant issue in the wireless industry. This problem is especially acute in military use, such as spy-nodes detection and communication orientation systems. In this paper, three different clustering methods are applied to classify the RSSI and LQI data recorded from the unknown wireless topology into a certain number of groups in order to determine the number of active sensor nodes in the unknown wireless topology. The results show that RSSI and LQI data are capable of determining the number of active communication nodes in wireless topologies. <\/jats:p>","DOI":"10.1155\/2014\/380526","type":"journal-article","created":{"date-parts":[[2014,5,15]],"date-time":"2014-05-15T08:20:39Z","timestamp":1400142039000},"page":"380526","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":19,"title":["RSSI and LQI Data Clustering Techniques to Determine the Number of Nodes in Wireless Sensor Networks"],"prefix":"10.1177","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8754-4355","authenticated-orcid":false,"given":"Yanwen","family":"Wang","sequence":"first","affiliation":[{"name":"Guangzhou Institute of Advanced Technology, Chinese Academy of Sciences, Guangzhou 511458, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ivan G.","family":"Guardiola","sequence":"additional","affiliation":[{"name":"Missouri University of Science & Technology, Rolla, MO 65401, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3228-0647","authenticated-orcid":false,"given":"Xiaoling","family":"Wu","sequence":"additional","affiliation":[{"name":"Guangzhou Institute of Advanced Technology, Chinese Academy of Sciences, Guangzhou 511458, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2014,5,13]]},"reference":[{"key":"B15a-2014-380526","volume-title":"Image Analysis and Mathematical Morphology","author":"Serra J.","year":"1983"},{"key":"B15b-2014-380526","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2818.1983.tb04252.x"},{"key":"B16-2014-380526","volume-title":"Morphological Image Analysis: Principles and Applications","author":"Soille P.","year":"2003"},{"key":"B1-2014-380526","volume-title":"Proceedings of the Field Failure Data Analysis Workshop (F2DA '09)","author":"Parameswaran A. 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