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Ancient maps remain largely unexplored documents that contain specific spatial information about the
state of the mapped territory. One such document is Rudolf Ritter von Otto's 1772 map, specifically
its sheet (Litt: I. No: 9), which depicts the city of Lviv and its surroundings. This map has served and
will continue to serve as an object of interdisciplinary research by historians, geographers, architects,
and urban planners. The research was carried out in GIS using a conventional coordinate system. It
has been established that all sheets of R. R. von Otto's map can be compared based on a square grid,
the distance between adjacent corners of which is two Viennese inches. The scale of this map in this
study is estimated at 1 : 57 200, which follows both from the reference of this map to the modern
topographic base and from our interpretation of the unit of length measurement – the German mile,
which is equal to 6027,6 m. This map is a valuable historical and cartographic source, as it predates
the well-known map of the First Austrian Survey by decades. R. R. von Otto's map records certain
details for the first time (for example, the first cartographic references to settlements). We see the
continuation of this research in a detailed analysis of the map's content, which became possible after
receiving scans of the original map from the Military Archive in Vienna
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