GPD+ Wet tropospheric correction

Along-track coverage of the Wet tropospheric correction (GPD+) for Cryosat-2, cycle 093. Credits CTOH/CNES.
Wet tropospheric correction in GPD+ dataset

Types of dataset: auxiliary product.  Wet tropospheric correction for the ERS-1, ERS-2, Topex/Poseidon, Envisat, Jason-1, Jason-2, Cryosat-2 and Saral/AltiKa missions.
Contents: GPD+ (GNSS (Global Navigation Satellite Systems) derived Path Delay Plus) wet tropospheric correction for each point in the corresponding GDR.
Use: coastal applications, ocean applications 
Description:Due to its large space-time variability, the wet tropospheric correction (WTC) is still considered a significant error source in satellite altimetry. The GPD+ dataset is the result of the most recent algorithm developed at the University of Porto to retrieve improved WTC for radar altimeter missions. The GPD+ WTC are estimated by space-time objective analysis, by combining all available observations in the vicinity of the point: valid measurements from the on-board microwave radiometer (MWR), from GNSS coastal and island stations and from scanning imaging MWR on board various remote sensing missions.

Format: NetCDF


Geographic coverage: Global

Data access: Through this CTOH data access request 

Copyright : 1993- ongoing. These products were developed and validated by the University of Porto, and are distributed by CTOH/LEGOS France. Publications should include the following statement in the Acknowledgments: “Altimetry data used in this study were developed and validated by the University of Porto, and distributed by the CTOH/LEGOS, France”.


SatelliteTypeForm-based accessData period










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cycles 1 to 53 (AVISO convention), 1991.8–1996.4

cycles 1 to 167, 1995.4–2011.5

cycles 6 to 113, 2002.4–2012.3

cycles 1 to 481, 1992.7–2005.8

cycles 1 to 424, 2002.0–2013.5

cycles 1 to 334, 2008.5–2014.7

cycles 1 to 56, 2016.2-2017.8

subcycles 4-94, 2010.7-2017.6

cycles 1 to 94, 2013/03/14-2016/01/28