The triangulation sheet, a square measuring 10 000 m x 10 000 m, is divided into 4 squares with the size of 5 000 m x 5 000 m. Such a square has a surface area of 2 500 ha in nature and forms the framework of the cadastral plan or aerial map, which in the scale of 1:10 000 results in a plan with dimensions of 500 mm x 500 mm. The datasets of Ölk together comprise 3922 sheets.
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