Abstract: The wireless sensor node have much application such as forest monitoring, habitat monitoring, security and military, disaster management, etc. Wireless sensor nodes are resource constrained, sensor nodes are small in size and have limited memory, low battery power and limited processing capability. Data aggregation is very important technique is wireless sensor node. Data aggregation eliminates the redundancy data helps to reduce to requirement of store the data and reduce power consumption. This works shows different data aggregation technique and comparative analysis between aggregation techniques.

Keywords: Wireless Sensor node, Data Aggregation, spatial correlation, time aggregation.