Constitutes the refereed proceedings of the 4th International Conference on GeoSpatial Semantics, GeoS 2011, that was held in Brest, France, in May 2011.

The Workshop Proceedings reflect problems of advanced geo-information science as far as they are specifically concerned with the maritime environment at large. The Proceedings incorporate papers presented by leading scientists researching in the considered professional area and by practitioners engaged in GIS and GIS applications development. They pay close attention to the problems of scientific and technological innovations and the ensuing opportunities to make seas safer and cleaner. Furthermore, they periodically measure the ground covered and new challenges with respect to economic and...

Reflecting problems of advanced geo-information science with a special emphasis on environmental and urban challenges, this book collects papers by leading researchers on environmental issues from modeling to analysis, information processing and visualization.

This text constitutes the refereed conference proceedings of the 12th International Symposium, W2GIS 2013, held in Banff, Canada, in April 2013. The 11 revised full papers and 5 short papers presented were carefully selected from 28 submissions. The program covers a wide range of topics including spatial semantics and databases, location-based services and applications, trajectory representation and sensor web, spatial analysis and systems and map generation and modelling.