This volume serves as the conference proceedings for the Third International
ConferenceonGeoSensorNetworks(GSN 2009)that washeld in Oxford UK in July 2009. The conference
addressed issues related to the deployment of geos- sor networks and the collection and
management of real-time geospatial data. This volume includes papers covering a variety of
topics ranging from sensing routing and in-network processing to data modelling analysis
and appli- tions. It re?ects the cross-disciplinary nature of geosensor networks by bringing
together ideas from di?erent ?elds such as geographic information systems d- tributed systems
wireless networks distributed databases and data mining. The papersincludedinthis
volumepushthe frontiersofGSN researchins- eral new directions. First they shift the
traditional paradigm of ?xed resour- constrained sensor networks to more versatile scenarios
involving mobile sensors with varying levels of computation sensing and communication
capabilities. Second emerging applications such as urban sensing are raising interesting new
GSN challenges such as participatory sensing as well as the need to st-
dardizeprotocolsandinterfaces andintegratemultiple sensornetworks.Finally technological
advances in geosensor networks have enabled the collection of vast amounts of real-time
high-resolution spatio-temporal data the sheer volume of these data raises the need for
e?cient data modelling analysis and pattern extraction techniques.
