|Observatories and Research Facilities for EUropean Seismology|
|Volume 3, no 1||June 2001||Orfeus Newsletter|
Implementing real-time data exchange at the ORFEUS Data Center
In order to address virtual
network heterogeneity on the collection end, the ODC has implemented the
Environmental Monitoring Software package developed by Boulder
Real Time Technologies, Inc.®. This software package allows
ODC to collect real-time data from a variety of different sources.
Furthermore, the package is capable of, and provides the capability to
develop, a significant amount of automated data processing; including the
production of event based data volumes. Any MEREDIAN participant
using Antelope can easily share their data with the ODC via built-in Antelope
transmission protocols. There are many other pre-existing methods
by which MEREDIAN participants and non-participants can provide real-time
data to ODC. It is also possible to develop new interfaces for data
submission if necessary. An Antelope software module that allows
the system to collect data using the SeedLink Protocol has been developed
at the ODC. This system gives the ODC a large amount of flexibility
in collecting data from various sources and capability for rapid automatic
processing. Figure 1 is an illustration of the Antelope based real-time
collection system being developed at the ODC.
Figure 1. A diagrammatic illustration of the Antelope based real-time seismic data collection system at the ORFEUS Data Center
and the KNMI. Data from 10 GEOFON
stations are collected using the SeedLink Protocol. Data from 1 GSS
and 7 ZAMG stations are collected using Antelope built-in transmission
protocols. Data from the KNMI are collected from a ComServ system.
Over the next couple of years we are expecting a significant increase in
the amount of data collected by the real-time system as we expand the virtual
network. As the network grows, information regarding the current
status of the initiative can be found at http://orfeus.knmi.nl/meredian/realtime-status/.
ORFEUS WILBER interface. The exact timing of data availability has not be decided. Potentially, a SEED data volume could be available within 5-15 minutes after an event. A follow-up SEED volume, superseding the initial one, could be produced 1-5 days after an event. This volume would probably be merged with data collected by other systems that have access to data that the real-time system will not, e.g. a Spyder®-like system. Naturally, these initial data products will not be quality controlled, but the result of automated processing. Finally, the data would go through a quality control procedure and be included in the normal electronic archive at the ODC. As necessary developments are completed we hope to eventually include data from most, if not all, of the MEREDIAN participants in the real-time initiative. Furthermore, we would also like to include non-participants whenever possible.
We would like to thank GEOFON
for cooperation in making needed software developments and for providing
real-time access to data for many GEOFON stations. And also, to ZAMG
and GSS for generously providing us with their real-time data streams during
the current testing phase. The MEREDIAN project is funded
by EC contract EVR1-CT-2000-40007.