| Sumario: | The historical geoportal of Lublin created by the "Grodzka Gate – NN Theatre" Centre is probably the first thematic portal using object-oriented spatiotemporal databases for presenting historical data in Poland. Authors discuss the theoretical and methodical basis of historical GIS system function and present the example of executed implementation – the interactive map of the non-existent Jewish district 'Podzamcze' in Lublin (www.teatrnn.pl/miejsca/mapa/lublin-podzamcze-czwartek). The application gives access to archival collection of documents as well as to the catalogue of events, places and people connected with the former Jewish district. Integration of genealogical databases, gazetteers, old maps/city plans and collections of archival documents with API Google Maps allows to discover the city independently and comparing historical events in historically accurate space along with the present one.
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