International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B4, 2012 
XXII ISPRS Congress, 25 August - 01 September 2012, Melbourne, Australia 
425 
Pietzuch, P.R., 2004. Hermes: A Scalable Event-based 
Middleware. Queens’ College, University of Cambridge, 
Cambridge, UK. 
Powell, D., 1996. Group Communication. Communications of 
the ACM, Vol. 39, Part. 4, pp. 50-97. 
Skeen, D., 1998. “Vitria’s Publish-Subscribe Architecture: 
Publish-Subscribe Overview” http://www.vitria.com (05 
January 2012). 
StreamBase, 2011. “StreamSQL Guide” 
http://www.streambase.com/developers/docs/latest/streamsql/in 
dex.html (05 January 2012). 
Terry, D., Goldberg, D., Nichols, D., and Oki, B., 1992. 
Continuous Queries over Append-Only Databases, In: the 1992 
ACM S1GMOD, pp. 321-330. 
TIBCO, 1999. “TIB/Rendezvous” TIBCO, Palo Alto, CA. 
http://www.tibco.com/multimedia/ds-rendezvous_tcm8-826.pdf 
(05 January 2012). 
Xu, N., 2002. “A Survey of Sensor Network Applications”, 
IEEE Communications Magazine, 
http://enl.usc.edu/~ningxu/papers/survey.pdf. 
ACKNOWLEDGEMENTS 
The authors would like to thank CANARIE, Cybera, Alberta 
Innovates Technology Futures, and Microsoft Research for their 
supports on this project.