OCTS - Ocean Color Temperature Sensor (on ADEOS Satellite, Japan)


OCTS is an optical imaging radiometer on board the ADEOS satellite. It mainly serves as an observation sensor of the ocean conditions, including chlorophyll and dissolved substances in the water, temperature profile and cloud formation processes. The ocean has great effects on our lives as well as the natural environment. Ocean surface temperature substantially interrelates with the global temperature changes since approximately 70% of the earth is coverd with the oceans. It is also important to get information on ocean primary production.

OCTS has 12 bands covering visible and thermal infrared region. In the visible and near-infrared bands, the ocean conditions are observed by taking advantage of spectral reflectance of the dissolved substances in the water and phytoplankton. On the other hand, the sea surface temperature is accurately measured in 4 thermal infrared bands. As the swath width of OCTS is about 1,400km with scanning mirror (west-east) and OCTS also scans south and north, it can observe the entire earth surface for 3 days. The spatial resolution is about 700m.

OCTS Instrument Characteristics

  • Orbit Altitude: 800 km
  • Orbit Type: Sun-Synchronous, 10:15 - 10:45 am local time at descending node
  • Orbit Inclination angle: 98.6 deg
  • Orbit Period: 101 min.
  • Orbit Repeat Cycle: 41 days
  • Swath Width: 1400 km
  • Resolution: 700 m

Ocean Color Bands of OCTS

Channel Central Wavelength (nm) Bandwidth (nm)
1 412 20
2 443 20
3 490 20
4 520 20
5 565 20
6 665 20

Link to: OCTS Web Page ( of the Earth Observation Research Center (EORC), NASDA, Japan.

Back to Main Index
Copyright CRISP, 2001