EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Where - A Software for geodetic Analysis

Ingrid Fausk, Michael Dähnn, and Ann-Silje Kirkvik
Ingrid Fausk et al.
  • Norwegian Mapping Authority, Geodesy division, Hønefoss, Norway (

Where is a software package developed by the Norwegian Mapping Authority (NMA). The software will provide a useful contribution to the International Terrestrial Reference Frame, by analysis of data from Very-long-baseline Interferometry (VLBI) and Satellite Laser Ranging (SLR).

Where is written in Python, and is taking advantage of well-tested code like the SOFA and IERS libraries. The architecture is easily maintainable and extendable. Python makes it easy to write, and utilizes external libraries written in faster languages.
Both the NMA and the Instituto Geografico Nacional, Spain, are in a test phase of deliveries of VLBI analysis results to the IVS with the Where software. After some improvements of the software, we will also deliver analysis results to the ILRS. Our goal is to receive full status as operational analysis center for both VLBI and SLR, and to contribute to ITRF2020.
Sharing and cooperating with other institutions is made possible by making Where an open source project on GitHub.

How to cite: Fausk, I., Dähnn, M., and Kirkvik, A.-S.: Where - A Software for geodetic Analysis, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-17532,, 2020

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