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Geographic routing has been paid much attention in query-based sensor networks since sensed data inherently pertain to the location of the data. In conventional geographic routing, the destination of a message should be the location of a node. However, this is not suitable for sensors that cover a wide or directed sensing area such as cameras. To cope with this problem, we propose a modified geographic routing scheme called SenriGan. SenriGan accommodates specifying a sensed point as a destination instead of using a location of a node. In this paper, we describe our proposed system architecture using image sensor networks and an implementation of its prototype.