The techniques for the alignment of ontologies have evolved from techniques to treat common ontologies to specific techniques for a specific domain, such as geographic, to the point of defining the term geo-ontology. As has been seen, the investigations carried out in the field of geo-ontology alignments are far from being completed. There is still no well-defined metodology to perform alignment. In these few years, the algorithms developed have been based on different strategies. In this paper, we survey some of the most relevant techniques for geospatial ontology aligment.