On Behalf Of The Duisburg Business Enterprise (Hereinafter Abbreviated As Wbd-Aör), The Location Of Canal Structures In The Entire Duisburg Urban Area In The Etrs89 (European Terrestrial Reference System 1989) With The Implementation Of 2025 And The Height Generally Above Normal Altitude Zero (Nhn) In The Dhhn16 Working Height Status 170 (German Main Height Network 2016). The Height Connection Must Always Be Established Via At Least Two Height Connection Points Of The National Survey Using Geometric Levels. The Position Control Point Field Is To Be Created Using Gnss Real-Time Rtk (Sapos-Heps With Vrs Correction Approach). The Required Absolute Accuracies Are 5 Cm In Position And 2 Cm In Height (Dwa-M 145-2). All Length And Height Units Must Be Given In Meters [M] And All Coordinates Recorded Must Be Stated In Etrs 89 With Illustration In Utm 32 (6-Digit Easting Without Preceding 32, 7-Digit Northing).
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