Pass locator

Jason-1 track coverage and track number with Google Earth.

Use Google Earth to check a pass number for:


  • Download the user manual with the Google Earth CFOSAT file and the txt file giving the UTC starting dates of each cycle. The combined use of these two files allows the computation of CFOSAT passes over dates and times, within five to ten minutes’ precision, which should be sufficient for product selection or for campaign preparation.

Topex/Poseidon, Jason-1/2/3:

SARAL/AltiKa, ERS-1/2, Envisat:

Copernicus Sentinel-3, Cryosat-2, Geosat Follow On:

  • Copernicus Sentinel-3 (ESA delivered the kml file with S3 ground-track points with a time step of 10 seconds, please refer to ESA's website).
  • Cryosat-2 (entire cycle)
  • GFO

(.kmz files)

Summary: Topex/Poseidon was launched on 1992 on a referenced orbit which was assumed by Jason-1 (on December 2001) and OSTM/Jason-2 (on June 2008). At the end of the Jason-1's calibration phase on September 2002, Topex/Poseidon was shifted on a new orbit, called interleaved orbit, on the midway of its old ground tracks. In the same way, at the end of OSTM/Jason-2's calibration phase on January-February 2009, Jason-1 was also shifted on the same Topex/Poseidon interleaved orbit. In order to better suit for real-time applications, Jason-1 also undergone a temporal shift with a time lag of approximately 5 days with respect to OSTM/Jason-2. In other words, when Jason-1 begins a new cycle with the pass #001, OSTM/Jason-2 begins the pass #127 (on the same cycle). On Oct. 2016, this is the same for Jason-3 on the referenced orbit and Jason-2 on the interleaved orbit.  From July 2017 (beginning at cycle 500), Jason-2 operates on a new long-repeat orbit (LRO) at roughly 1309.5 km altitude. From July 2018 (beginning cycle 600), Jason-2 operates on an interleaved long repeat orbit (i-LRO), for the second geodetic cycle, on a ground track in the middle of the grid defined by the first geodetic cycle. 

SWOT (to be launched on 2020): Scientific Orbit

Ground track and Swath files (kml & shapefiles)