Cartometric analysis of the Czechoslovak version of 1:75 000 scale sheets of the Third Military Survey (1918–1956)

Abstract

The 1:75 000 scale Special Map (SM75) series of the Third Military Survey is analysed in this work. Geographic co-ordinates of the sheet corners are computed from the sheet number codes, as well as their grid co-ordinates in the modern Křovák Projection and Czech and Slovak national grid called S-JTSK. Distortions caused by paper drying and shrinkage were analysed and a mathematical algorithm is given to compute their effects. Statistical analysis shows that the shrinkage is direction-dependent at the studied 125 map sheets throughout the Czech Republic. This analysis also verified the usefulness and practical adaptability of the shrinkage correction method to obtain more precisely rectified map sheets for GIS applications.

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