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The original file that existed before 2004 was generated mainly by student volunteers and CVC staff. Starting 2004, original file underwent major and substantial revisions using orthophotos and field observations. Starting from 2015, LiDAR-based DEM and contour lines were used to refine the line network.
From 2020-2022, new features were added, and some were modified or removed. The content of the attribute table was not updated.