Tsunami Warning Centre in Jakarta
Software Developed for Tsunami Warning Centre
STI provided know-how by engineering and implementation of major components of the Tsunami Warning Centre software. These components include:
- interfaces for easy sensor integration
- command and control of sensor stations
- sensor data standardisation for smooth database interaction
- design and implementation of workflows within the internal Warning Centre software
Main technologies which were used for the realisation are:
- Java: J2EE/JBoss, JMS, EJB, JPQL, etc.
- Databases: PostgreSQL (including GIS extensions), MySQL
- Standards & Technoligies: Service Oriented Architecture (SOA), Sensor Web Enablement (SWE), WSDL, SensorML, QuakeML, etc.
- Networking: customised Nagios installation for monitoring, redundant topology incl. switches
- Systems: Linux (virtualisation via Xen on 32 core SUN hardware), NAS (some terabytes connected via fiber), completely redundant hardware
Communication Challenges and Activities
The GITEWS project required communication platforms and facilities with affordable cost and acceptable technical complexity. The objective was to design and implement a reliable, real-time satellite communication between buoys, tide gauges, GPS- and seismic stations, and the Warning Centre in Jakarta.
In this context, STI provided system engineering support by:
- analysis of sensor / sensor stations specifications esp. data rates estimations,
- specification of communication demands (real-time, low/high data rates, bursts, etc.),
- evaluation of various satellite communication platforms
- selection, procurement, installation and test of different satellite communication systems
- own communication hub for the Warning Centre
Selected Communication Solutions
VSAT for continuous data transmission needs:
- Seismic and GPS stations (over 40 stations)
- data rates between 10 to 15kbit/s per station
- operational cost driven decision and use of suitable Indonesian Teleporter
BGAN (Imnarsat system) for event driven transmission needs:
- tide gauges and buoys (~20 stations)
- data rates between 1 to 10kbit/s per station
- decision driven by simplicity of installation and field handling
Further, additional satellite communication systems are used in the GITEWS project. However, they are used as backup links to the sensor stations and buoys only, since their performances do not meet the operational needs.