ABSTRACT Real-time systems applied to seismic data acquisition, asynchronous processing, and data archiving tasks have clearly demonstrated their utility.

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Presentation transcript:

ABSTRACT Real-time systems applied to seismic data acquisition, asynchronous processing, and data archiving tasks have clearly demonstrated their utility to the geophysical monitoring community. Many of the technological components have potential far beyond seismology, however. The need for real-time delivery of packetized data, integrated with processing, acquisition, and archiving systems is shared with many other signal domains used in environmental monitoring, including image acquisition, GPS surveys, weather monitoring, infrasound, and many more. As part of the UCSD ROADNet project, we have begun applying the Antelope Environmental Monitoring System to several of these new signal domains. We demonstrate prototype monitoring applications that integrate near-real-time, remote image acquisition from the Santa Margarita Ecological Reserve with the existing UCSD seismic data acquisition system. We discuss application of this technology to wireless acquisition of image, GPS, and real-time ship’s position and attitude data from the R/V Roger Revelle, in order to demonstrate the potential of the new monitoring technologies. Finally, we discuss the issues involved in generalizing the packet handling, namespaces, and data access issues for such generalized monitoring platforms. Generalizing Seismic Processing Systems to Diverse Signal Domains K.G. Lindquist *, F.L. Vernon †, T.S. Hansen ‡, A. Rajasekar ‡, B. Ludaescher ‡, J. Orcutt †, J. Berger †, H.W. Braun ‡, Y. Bock † * Lindquist Consulting † Institute of Geophysics and Planetary Physics, UCSD (IGPP) ‡ San Diego Supercomputer Center (SDSC) Future Directions Future work falls into two categories: expansion and enhancement of the code to handle new signal domains; and virtualization of data access. The latter will be handled by combining the Antelope orbserver with the Storage Resource Broker (SRB) project at the San Diego Supercomputer Center. The three figures at right and below sketch the features and benefits of the prototype Virtual-ORB (VORB) implementation under development. For more information: Axis 2400 Video Servers Santa Margarita Ecological Reserve R/V Roger Revelle The images above were both acquired from Axis 2400 video servers (Axis Communications, Inc.). The top image is from the Santa Margarita Ecological Reserve (south of Temecula, CA); the bottom image is from one of the research ships run by the Scripps Institute of Oceanography, the Research Vessel Roger Revelle. As with the Ricoh i700 images, the acquired pictures are placed on the orb alongside seismic data for telemetry and distribution, and displayed with the orbmonimg utility. The seismic stations shown are from the Anza array in Southern California. GPS and Heading data from R/V Roger Revelle The web-page snapshots above show GPS position and heading data from the R/V Roger Revelle, encoded as NMEA (National Marine Electronics Association) strings and delivered via the orbserver. In the case of this web page, a Common Gateway Interface (CGI) script connects directly to the orb to retrieve and display data. In more sophisticated, future applications, this will be mediated by a relational-database as a short-term buffer. Real-time, Integrated Seismic and Image Monitoring Ricoh i700 Internet Camera Wireless Telemetry Joint Seismic and Image Data Acquisition: Coronado Bridge Demonstration These images show various aspects of simultaneous, real-time monitoring in multiple signal domains. All snapshots here were taken during the May 15, 2002 demonstration of seismic and visual instrumentation on the Coronado Bridge in San Diego. A wireless b IP network delivers near-real-time seismic data from a Kinemetrics episensor attached to a Quanterra Q330 datalogger, as well as near-real-time imagery from a Ricoh i700 internet camera. Time stamped packets are acquired and delivered to an integrated monitoring system based on the Antelope orbserver. A prototype real-time display utility, orbmonimg, shows all data as they come in. The ultimate challenge for a real-time geophysical monitoring system is whether it can handle any type of sensor data which might be useful to incorporate: from seismic and infrasound to images, weather, GPS, Ocean Buoy data, stream level data etc. The figures below show the structure of a generalized monitoring system; the classes of software functions that need to be designed, in general, for the incorporation of new signal domains; and the some of the signal domains which our project will be working on. Packet Namespace Conventions Data packets on an Antelope orbserver can be any arbitrary binary objects, provided they have a timestamp (a UNIX epoch time) and a source-name (A character string of, at maximum, 63 characters). For seismic stations this takes the form net_sta_chan/CODE/SUBCODE where CODE identifies the structure of the data-packet contents, with an optional SUBCODE for further classification. For the work described here we have been using the code “EXP” for “experimental,” while details of packet unstuffing are studied. The net_sta_chan part of the source name is replaced by namespace_sensor_sensorpart. An example might be SIO_Revelle_Gyro/EXP/NMEA for gyroscopic data from the R/V Roger Revelle.