This book constitutes the refereed proceedings of the Third International Conference on
GeoSpatial Semantics GeoS 2009 held in Mexico City Mexico in December 2009. The 10 revised
full papers presented together with 2 keynote speeches were carefully reviewed and selected
from 19 submissions. The papers are organized in topical sections foundations on geo-semantics
formal representation of geospatial data semantics-based information retrieval and
recommmender systems integration of sematics into spatial query processing and geo-ontologies
and applications.
