Ontology alignment is an important task for information integration. There are many ongoing efforts to develop matching systems but these systems are not efficient for all application domains or ontologies. Very often the quality of the results can be improved by considering the specificities of the domain ontologies. In this paper, we propose an approach implemented in TaxoMap Framework, based on the alignment tool TaxoMap, which helps an expert to specify treatments exploiting mappings. The aim is to refine an alignment or to merge, restructure or enrich ontologies. We apply our approach to mapping refinement in the topographic field within the ANR (The French National Research Agency) project, GeOnto.