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SensorGrid

SensorGrid. Galip Aydin June 26 2005. SensorGrid. A flexible computing environment for coupling real-time data sources to High Performance Geographic Information Systems (GIS) applications. Based on Service Oriented Architecture (SOA) principles and High Performance Web Services ideas.

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SensorGrid

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  1. SensorGrid Galip AydinJune 26 2005

  2. SensorGrid • A flexible computing environment for coupling real-time data sources to High Performance Geographic Information Systems (GIS) applications. • Based on Service Oriented Architecture (SOA) principles and High Performance Web Services ideas. • Real-time sources publish their data products via standard interfaces in common formats and clients have access to both streaming and archived data.

  3. Open Standards • SensorGrid will combine Open GIS standards for data and services with Web Services specifications. • GML and SensorML, OGC (Open Geospatial Consortium Inc.) specifications for encoding geospatial data and sensor metadata in XML will be adopted for universal compatibility with larger GIS community. • WS-* specifications will be utilized to ensure access to these data via standard interfaces.

  4. High Performance Transport • To provide high performance transport between services we use NaradaBrokering as the messaging substrate. • NaradaBrokering is also used to provide real-time data access in a streaming fashion. • NB ensures reliable delivery of events in the case of broker or client failures and prolonged entity disconnects. • Implements high-performance protocols (message transit time of 1 to 2 ms per hop)

  5. Major SensorGrid Components

  6. Initial Implementation SOPAC GPS ServicesReal Time Streaming Support for Position Messages

  7. SOPAC GPS Services • As a case study we implemented services to provide real-time access to GPS position messages collected from several SOPAC networks. • Next step is to couple data assimilation tools (such as RDAHMM) to real-time streaming GPS data. • A Sensor Collection Service will be implemented to provide metadata about GPS sensors in SensorML.

  8. Position Messages • SOPAC provides 1-2Hz real-time position messages from various GPS networks in a binary format called RYO. • Position messages are broadcasted through RTD server ports. • We have implemented tools to convert RYO messages into ASCII text and another that converts ASCII messages into GML.

  9. Real-Time Access to Position Messages • We have a Forwarder tool that connects to RTD server port to forward RYO messages to a NB topic. • RYO to ASCII converter tool subscribes this topic to collect binary messages and converts them to ASCII. Then it publishes ASCII messages to another NB topic. • ASCII to GML converter subscribes this topic and publishes GML messages to another topic.

  10. SOPAC GPS Services

  11. GPS Stations • Current implementation provides real-time access to GP messages to following stations in RYO, ASCII and GML formats:

  12. NaradaBrokering topics

  13. Software • Please visit http://www.crisisgrid.org/html/sensorgrid.html for more information on SensorGrid and software that includes tools for providing real-time access to SOPAC position messages.

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