near-real-time precipitation virtual sensor using nexrad data
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 transformation steps to produce such new time series data stream are implemented as a set of scientific workflows. A streaming data ontology is developed to handle temporal proximity concepts such as "previous" and "next" for irregular temporal data streams. Data and metadata management is provided by a semantic content management middleware. The new point-based virtual sensor can lower the barriers of using NEXRAD data for many hydrological applications.
precipitation virtual sensor nexrad digital watershed workflow ontology