David J. Hill

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—This paper presents a Web 2.0 virtual observatory framework applied in an environmental watershed research context, where users not only can access existing sensor data such as the USGS (United States Geological Survey) rain gage data in near real-time, but also can create and share virtual sensors and trigger their associated workflows on-the-fly.(More)
This paper describes our first step towards the realization of complex and large scale cross-organization virtual observatories by presenting a new semantically-enhanced " Sensor Network as a Service " (SNaaS) framework, which can repurpose existing sensor networks as needed and aggregate and fuse heterogeneous sensors into new virtual sensors in(More)
In this demonstration paper, we describe the technologies and implementations that allow near real-time creation of new virtual precipitation sensors using NEXRAD Level II streaming data at user-specified point locations and time intervals in an integrated digital watershed with a Google Map-based web interface. The spatiotemporal and thematic(More)
Situational awareness of urban flooding during storm events is important for disaster and emergency management. However, no general purpose tools yet exist for rendering rainfall accumulations in real-time at the resolution of hydrologic units used for modeling. This demonstration will exhibit a novel web 2.0 visual analytical approach for understanding and(More)
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