With the increase in applications for sensor networks, data manipulation and representation have become a crucial component of sensor networks. This chapter explores an implementation to process and interpret the data gathered by sensor networks. In a project supported by SensIT program at DARPA, we have built wireless sensor networks deployed to monitor rare plants or other endangered species. The environmental data, such as temperature, rainfall, and sunlight, around the plants are sent by the wireless sensor networks to a base station. The system presented in this chapter combines database management technology, geographic information system, and Web development technology to visualize the data gathered by the wireless sensor networks. The integration of our data visualization tools and the online collaborative discussion environment makes the system useful to different communities of potential users.