  Accurate land use maps, describing the territory from an anthropic
utilisation point of view, are useful tools for land management and planning.
To produce them, the use of optical images alone remains limited. It is
therefore necessary to make use of several heterogeneous sources, each carrying
complementary or contradictory information due to their imperfections or their
different specifications. This study compares two different approaches i.e. a
pre-classification and a post-classification fusion approach for combining
several sources of spatial data in the context of land use classification. The
approaches are applied on authoritative land use data located in the Gers
department in the southwest of France. Pre-classification fusion, while not
explicitly modeling imperfections, has the best final results, reaching an
overall accuracy of 97% and a macro-mean F1 score of 88%.
