OceanSat-2

Mission

blue arrow Overview

OceanSat-2 is an oceanography satellite from India which launched on 23rd September 2009 and remains operational.

 

Mission Parameters
Orbit Height 720km
Orbit Type Polar Sun-synchronous
Orbit period 99.31 minutes
Revisit time 2 days
Inclination 98.28°
Equator crossing time 12:00

blue arrow Objectives

The main objectives of OceanSat-2 are to study surface winds and ocean surface strata, observation of chlorophyll concentrations, monitoring of phytoplankton blooms, study of atmospheric aerosols and suspended sediments in the water. OceanSat-2 plays an important role in forecasting the onset of the monsoon and its subsequent advancement over the Indian subcontinent and over South-East Asia.

 

blue arrow Instruments

OCM-2 (Ocean Colour Monitor-2)

OCM-2 is an improved version of the one flown on OceanSat-1. OCM-2 is a solid-state radiometer providing observations in eight spectral bands in the VNIR region. It is an 8-band multi-spectral camera operating in the Visible – Near infrared spectral range. This camera provides an instantaneous geometric field of view of 360 m and a swath of 1420 km. OCM can be tilted up to + 20 degrees along track.

OCM instrument Specifications

Parameter

Value

Spectral range (8 bands)

0.4 - 0.9 µm (VNIR)

Scan plane tilt

±20º,to avoid sun glitter

Camera MTF

>20% at Nyquist frequency

IFOV at nadir (spatial resolution)

LAC: 360 m x 236 m
GAC: 1 km

FOV (swath)

1420 km (±43º)

Tilt capability

±20º along track

Data quantization

12 bit

Data rate (real-time)

20.8 Mbit/s

Instrument mass

78 kg

SNR > 512 (saturation)
Effective focal length 20 mm
Absolute radiometric accuracy <10%
Onboard calibration 2 LEDs per band
Instrument power 134 W

 

Table of Bands
Spectral band

Wavelength range (nm)

Application

B1 404-424  Yellow substance absorption
B2 431-451  Chlorophyll absorption
B3 476-496  Chlorophyll and other pigments
B4 500-520  Turbidity and suspended sediments
B5 546-566  Chlorophyll reference
B6 610-630  Total suspended matter estimation
B7 725-755  Atmospheric correction
B8 845-885  Atmospheric correction/aerosol optical thickness

 

Non-scientific measuring instruments

Scanning Scatterometer (SCAT): an active microwave device used to determine ocean surface level wind vectors through estimation of radar backscatter.
Radio Occultation Sounder for Atmospheric Studies (ROSA): a GPS occultation receiver provided by ASI (the Italian Space Agency) with an objective to characterise the lower atmosphere and the ionosphere.

blue arrow Data

blue arrow DATA DOWNLOAD

Download data from Oceansat-2 mission through the ESA TPM Online Dissemination system. The data is freely available to registered EO-SSO users.

blue arrow DATA DESCRIPTION

ESA offers to registered user the access through the Online Dissemination server to the following data collections

  • OceanSat-2 NRT data: All passes over Neustrelitz are every day acquired, systematically processed to Level 1B, 2B and 2C, and made available in NRT