GeoS 2007 was the second edition of the International Conference on Geospatial Semantics. It was held in Mexico City, November 29–30, 2007. Semantics has become one of the most important topics of research in c- puter and information sciences. After many of the basicproblems in information sharing and use were solved, it became time to face the most challenging one of all:how to make sense ofall the informationavailable evenwhen it was collected and organized by di?erent people under di?erent premises? Geographic information science is no di?erent in this aspect. Although we start with more or less the same spatio-temporal cognitive abilities, when it comes to splitting the world into objects and ?elds, ?at and bona ?de bou- aries, and events and processes, we have a hard time understanding each other’s information and its underlying assumptions. This is where GeoS 2007 tries to ?t in and to bring some of the of state-of-the-art research results related to the many facets of modeling and processing geospatial semantics. This volume contains 19 papers, which were selected from among 35 subm- sions received in response to the Call for Papers. Each submission was reviewed by three or four Program Committee members and 15 full and 4 short papers werechosenfor presentation. The papersfocused on geo-ontologiesrangingfrom alignment and integration aspects to how to create and use them in infor- tion retrieval.