Animation with the 4 satellites grounds tracks (Jason2-Saral/AltiKa-Cryosat2-HY2A)

Grounds tracks for the 4 operational satellites on June 2015, over the Mediterranean Sea: Jason-2 ground tracks are blue, Saral/altiKa are green, Cryosat-2 are red and HY-2A are pink.

The ground tracks are displaying (and are cumulating) for each satellite and over a 10-day period (Jason-2 cycle) with a 1-hour delay between each frame. Days are written on the top of the maps with the units "Julian Days". The day for the first map (23 921) corresponds to 30 June 2015. 

The orbit of an altimetry satellite is a compromise between spatial resolution (the distance between two ground tracks) and temporal resolution (delay between two revisits): Combine several satellites is a solution: 

  • Jason-2 has a repeat cycle of 10 days with a ground track separation of 315 km at the equator,
  • Saral/AltiKa: 35 days, 75 km,
  • Cryosat-2: 369 days (subcyle jours 30 days),
  • HY-2A : 14 and 168 days.

A multisatellite system as this 4-satellite configuration allows more along-track data for model assimilation, higher resolution of multi-mission mesoscale maps and better resilience of the multi-mission observation system if an old altimeter becomes unavailable.


File Type Size Lang Resolution Creation date Represented date
traces_AllMissions_perhour_Med_23921_23931_logo.avi Video 25.42Mb 2015-07-30 2015-06-30
traces_AllMissions_perhour_Med_23921_23931_logo_sm.avi Video 12.04Mb 2015-07-30 2015-06-30
traces_AllMissions_logo_sm_264.png Image 479.19kb 746x473 2015-07-30 2015-06-30
traces_AllMissions_logo_sm_14.png Image 175.57kb 746x473
traces_AllMissions_perhour_Med_23921_23931_logo_sm.mpg Video 7.4Mb 2015-07-30 2015-06-30