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Abstract
The historical GIS is, without any doubt, a powerful means of communication of historical phenomena for the public and also of collecting georeferenceable historical source through crowdsourcing activities, but the complexity of the data model underlying a GIS can also distance the public from understanding the complexity of the phenomena themselves. From this point of view the role of the Digital Public Historian is essential: not only will he/she have to be able to construct a GIS with a methodologically correct data model, but he/she will have to find the right ways of communicating it in order to make the GIS an effective tool of understanding and sharing the past.
