![ZTD radiosonde biases](/_productsservices/troposphere/images_repro2/bias_rs_eu0_lama.gif)
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Purpose
- Validate EUREF EPN-repro2 combined Zenith Path Delay (ZPD) parameters with ZPD derived from radiosonde (RS) data at co-located sites
- Variations and differences are influenced by the horizontal distance between the two stations
- Time series of differences reflect changes in analysis strategy
Procedure
- Download of RS data provided by EUMETNET, based on the EUREF-EUMETNET MoU
- Processing ZPD parameters (software provided by H. Vedel, Danish Meteorological Institute (DMI))
- Geoid undulations at co-located sites are taken into account
- Differences at co-located sites for identical points in time
GNSS Solutions
- Results from GPS weeks 834 (1996) until 1824 (2014) are based on EPN-repro2 results
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