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In wireless sensor networks, data aggregation is a vital technology to save energy. Data aggregation is essential for the efficient operation of wireless sensor network. Data aggregation has been widely recognized as an efficient method to reduce energy consumption by reducing the number of packets sent. There are different techniques of data aggregation like tree formation for data collection, cluster formation for data collection and chain formation for data collection and tree based approach is explored here. The tree based routing proto-cols supports homogeneous networks only but not heterogeneous networks for data aggregation.