WP4: Improving Surveying Practice

WP4 is intended to unite the individual developments in a joint international comparison (see Fig. 5). In addition, a meta‑analysis of the various results is planned to deduce good practice guidelines for both technologies, optical and GNSS‑based distance metrology.

One major project of the JRP is the organisation and joint analysis of a large round robin, intended both to link major high-level geodetic reference baselines in Europe and to verify the developed devices of the JRP.

During a 3 month measurement campaign, the Nummela baseline was successfully recalibrated by white light interferometry to prepare the JRP round robin in WP4. This critical measurement makes it possible to compare the novel methods developed in this system to the best state‑of‑the‑art traceable reference for long distance measurements.

Three external parties, the National Institute of Metrology (NIM) of China, the Korea Advanced Institute of Science and Technology (KAIST), and the Korean Research Institute for Standards and Science (KRISS) have declared their intention to participate at the round robin with different forefront EDMs.

First field measurements have already been performed by FGI at the Opens external link in new windowbaseline of the University of the German Armed Forces at Neubiberg, Germany, and at theOpens external link in new window 600 m baseline of PTB, Braunschweig. NIM and NSC-IM have measured the 600 m baseline at PTB as well.

Sketch of the various measurements of the EDM round robin ((c) by PTB).