Jason-2 Along-Track Near Real-Time Sea Surface Height Anomaly Data

GPS-based Operational Geophysical Data Record (GPS-OGDR-SSHA) for OSTM/Jason-2 --------------------------------------------------_--------------------------- Date: June 5, 2009 The OSTM/Jason-2 GPS-OGDR-SSHA product is identical to the official OGDR-SSHA product generated and distributed by NOAA and EUMETSAT, except that it contains two additional fields in the NetCDF file: 1) gps_alt - GPS-based orbit altitude of the satellite. 2) gps_ssha - Sea surface height anomaly derived by using the GPS-based orbit altitude (gps_alt) instead of the DORIS-DIODE based orbit altitude (alt). e.g. ssha-alt+gps_alt The GPS-OGDR-SSHA product is available with a typical latency of 4 hours from the last available measurement on each data file, and the GPS-based orbit altitude has accuracies of < 1.5 cm (RMS).

The GPS-OGDR-SSHA product is available via ftp at the Physical Oceanography Distributed Active Archive Center (PO.DAAC): ftp://podaac.jpl.nasa.gov/pub/sea_surface_height/ostm/preview/GPS-OGDR/ Note that the Jason-2 GPS-OGDR-SSHA product is a research-grade product that is generated on a best efforts basis by the Orbiter and Radio Metric Systems group at JPL. Please refer questions or comments to: Shailen Desai (Shailen.Desai@jpl.nasa.gov)