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GPD+: Wet tropospheric correction

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+ 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

References:

  • Fernandes, M. Joana, Clara Lázaro, Michaël Ablain, and Nelson Pires. 2015. “Improved Wet Path Delays for All ESA and Reference Altimetric Missions.” Remote Sensing of Environment 169 (November): 50–74. doi:10.1016/j.rse.2015.07.023.
  • Fernandes, M., and Clara Lázaro. 2016. “GPD+ Wet Tropospheric Corrections for CryoSat-2 and GFO Altimetry Missions.” Remote Sensing 8 (10): 851. doi:10.3390/rs8100851.

Geographic coverage: Global 

Data access: Through this CTOH undefineddata access requestundefined 

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”.

Delayed-time

SatelliteTypeForm-based accessData period

ERS-1

ERS-2

Envisat

TOPEX/Poseidon

Jason-1

Jason-2

Cryosat-2

Saral/Altika

along-track
undefinedCTOH data access request form

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

cycles 1 to 167, 1995.4–2011.5

cycles 1 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 226, 2008.5–2014.7

subcycles 4-86, 2010.7-2016.12

cycles 1 to 30, 2013/03/14-2016/01/28

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