The European XFEL is an X-Ray Free-Electron Laser with a wavelength between 5 and 0.05 nm
and a repetition rate of 27000 flashes per second. Civil construction started in 2009. As of 2017
the Accelerator and parts of the Undulator section are already commissioned. This presentation
overviews the geodetic work during the construction phase, like fiducialization and alignment of
components. The creation of the geodetic tunnel reference network is shown, as well as the
merging with straightness information introduced by a novel "Straight Line Reference System"
(SLRS), that was developed by the DESY alignment group.
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The European XFEL - Alignment Work and Geodetic Control Network Adjustment1h