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Integrated Multi-Mission Ocean Altimeter Data for Climate Research Version 5.1. DOI:

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Integrated Multi-Mission Ocean Altimeter Data for Climate Research Version 4.2

3 Publications Cited this Dataset
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DescriptionThis dataset contains along track geo-referenced Sea Surface Height Anomalies (SSHA) from TOPEX/Poseidon, Jason-1, OSTM/Jason-2 and Jason-3 (depending on time period) merged into a single mean reference orbit. All biases and cross-calibrations have been applied to the data so SSHA are consistent between satellites to form a single climate data record. Altimeter data from the multi-mission Geophysical Data Records (GDRs) are interpolated to a common reference orbit facilitating direct time series analysis of the geo-referenced SSH. However this product does not use the TOPEX internal calibration-mode range correction. This is the main difference between version 4 and version 4.2. More information on this calibration can be found at Beckley et al. 2017 DOI 10.1002/2017JC013090. The data are in netCDF format. Each file consists of one cycle of data, which is approximately 10 days long. Cycle 001 coincides with cycle 001 of TOPEX/Poseidon (September 25-October 3, 1992).
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NameLong NameUnit
Distance_to_coast Along Track Distance to Coastm
flagFlag value for representing different errors in the sea surface height anomaly estimates
indexAlong Track Location Indexed within a Reference Orbit Revolution
mssMean Sea Surface Height above Reference Ellipsoidmm
reference_orbitReference Orbit Revolution Number
sshSea Surface Height Anomalymm
Surface_TypeType of SurfaceNone
timeSeconds from epoch 01/01/1992 00:00:00 (MJD = 48622.0)seconds
Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
Citation Beckley, B.; Zelensky, N.P.; Holmes, S.A.;Lemoine, F.G.; Ray, R.D.; Mitchum, G.T.; Desai, S.; Brown, S.T.. 2017. MERGED_TP_J1_OSTM_OST_CYCLES_V42. Ver. 4.2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at

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Journal Reference Beckley, B.D., N.P. Zelensky, S.A. Holmes, F.G. Lemoine, R.D. Ray, G.T. Mitchum, S. Desai, S.T. Brown, Assessment of the Jason-2 Extension to the TOPEX/Poseidon, Jason-1 Sea-Surface Height Time Series for Global Mean Sea Level Monitoring, Marine Geodesy, 33(S1): 447-471, 2010, Supplemental Issue on OSTM/Jason-2 calibration/validation, Vol. 1, DOI: 10.1080/01490419.2010.491029.