Austrian aerial map (Oilk)

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