The German Main Height Network (DHHN) describes the height reference system with the official heights above NN. The height points (NivP) are determinations that are geodeticly determined, secured and measured. Their data is recorded under a point mark in the proofs of the fixed points. The proofs of the fixed points are divided into an overview of the fixed points based on the topographic map 1:25,000 (TK25) as a point signature with point number, a point description (measurement sketch) and a point file (height value).
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