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The advantages of using the Second Military Survey maps in fluvial studies

The Second Military Survey of the Habsburg Empire, completed in the 19th century, can be very useful in different scientific investigations owing to its accuracy and data content. The fact, that the mapmakers used geodetic projection and the high accuracy of the survey guarantee that scientists can use these maps and the represented objects can be evaluated in retrospective studies. Among others, the hydrological information of the map sheets is valuable. The streams were drawn with very thin lines that also ascertain the high accuracy of their location, provided that the geodetic position of the sheet can be constructed with high accuracy. After geocoding these maps we noted the high accuracy of line elements.The goal of this paper is to verify the accuracy of the rectified map sheets of the study area in order to test the applicability of such an analysis of the represented geomorphologic features like relief and streams. In the geomorphologic investigations high geometrical accuracy is needed due to the quantitative character of measurements. The study area is located at the Austrian-Hungarian boundary, south from Kőszeg Mountains/Günser Gebirge and west from Rába River/Raab Fluss.