WMO OSCAR | Details for Instrument COCTS

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Instrument: COCTS

Instrument details

Acronym	COCTS
Full name	China Ocean Colour & Temperature Scanner
Purpose	Ocean colour and sea surface temperature
Short description	10 channels (8 narrow-bandwidth in VNIR, 2 in TIR) [see detailed characteristics below]. On HY-1C and follow-on, COCTS is supported by a 2-channel Ultraviolet Imager (UVI) to improve the atmospheric correction accuracy of high turbid water in the near shore and, in addition, a 10-channel Satellite Calibration Spectrometer (SCS) to cross-calibrate the 8 VNIR channels of COCTS and the 2 channels of UVI
Background	Consolidated technology
Scanning Technique	Cross-track scanning. 1024 pixel/line, swath 1800 km (increased to 2900 km in HY-1C and HY-1D)
Resolution	1.1 km s.s.p.
Coverage / Cycle	Global daily coverage for short-wave channels, two coverages/day for TIR channels
Mass	50 kg	Power	70 W	Data Rate	670 kbps

Providing Agency	NSOAS
Instrument Maturity	Flown on operational programme
Utilization Period:	2002 to 2026
Last update:	2021-06-22

Detailed characteristics

Central wavelength	Bandwidth	SNR or NE∆T @ specified input
412 nm	20 nm	349 @ 91.0 W m^-2 sr^-1 µm^-1
443 nm	20 nm	472 @ 84.1 W m^-2 sr^-1 µm^-1
490 nm	20 nm	467 @ 65.6 W m^-2 sr^-1 µm^-1
520 nm	20 nm	448 @ 54.6 W m^-2 sr^-1 µm^-1
565 nm	20 nm	417 @ 45.7 W m^-2 sr^-1 µm^-1
670 nm	20 nm	309 @ 24.6 W m^-2 sr^-1 µm^-1
750 nm	40 nm	319 @ 16.1 W m^-2 sr^-1 µm^-1
865 nm	40 nm	327 @ 10.9 W m^-2 sr^-1 µm^-1
11.0 μm	1.0 μm	0.2 K @ 300 K
12.0 μm	1.0 μm	0.2 K @ 300 K

Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Hai Yang 1 (NSOAS)
- HY-1A (see instrument status) Aug 2002 - Mar 2004
- HY-1B (see instrument status) Oct 2007 - Feb 2016
- HY-1C (see instrument status) Sep 2018 - 2025
- HY-1D (see instrument status) Jun 2020 - 2026

Instrument classification

Earth observation instrument
Passive optical radiometer or spectrometer
Moderate resolution optical imager

WIGOS Subcomponents

Subcomponent 1
Narrow-band or hyperspectral imagers
Narrow-band imager (for ocean colour)

Mission objectives

Primary mission objectives

Aerosol Optical Depth
Aerosol column burden
Biomass
Colour Dissolved Organic Matter (CDOM)
Earth surface albedo
Fraction of Absorbed PAR (FAPAR)
Leaf Area Index (LAI)
Normalised Difference Vegetation Index (NDVI)
Ocean Diffuse Attenuation Coefficient (DAC)
Ocean chlorophyll concentration
Ocean suspended sediments concentration
Oil spill cover
Photosynthetically Active Radiation (PAR)
Sea surface temperature

Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
Note: * Primary mission objective.

Search:

Variable	Relevance for measuring this variable	Operational limitations	Explanation
Aerosol column burden*	3 - high	Cloud sensitive.. Daylight only.	VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Aerosol effective radius	3 - high	Cloud sensitive.. Daylight only.	VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Aerosol mass mixing ratio	3 - high	Cloud sensitive.. Daylight only.	VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Aerosol Optical Depth*	3 - high	Cloud sensitive.. Daylight only.	VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Aerosol type	3 - high	Cloud sensitive.. Daylight only.	VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Cloud cover	3 - high	No specific limitation.	VIS, NIR and TIR channels
Fraction of Absorbed PAR (FAPAR)*	3 - high	Cloud sensitive.	VIS channels including Red at 700 nm
Normalised Difference Vegetation Index (NDVI)*	3 - high	Cloud sensitive.	VIS and NIR channels
Photosynthetically Active Radiation (PAR)*	3 - high	Cloud sensitive.	VIS channels, range accurately sampled
Aerosol volcanic ash	3 - high	Cloud sensitive.. Daylight only.	VIS and NIR channels including 760 nm for high-level ashes
Aerosol volcanic ash Total Column	3 - high	Cloud sensitive.. Daylight only.	VIS and NIR channels including 760 nm for high-level ashes
Cloud optical depth	4 - fair	Low-density cloud only.. Daylight only.	VIS and NIR channels
Cloud top height	4 - fair	No specific limitation.	TIR window channels to estimate cloud top height from its temperature
Cloud top temperature	4 - fair	No specific limitation.	TIR window channels
Cloud type	4 - fair	Daylight only.	VIS and TIR channels
Colour Dissolved Organic Matter (CDOM)*	4 - fair	Cloud sensitive.. Daylight only.	Many narrow-bandwith VIS channels, suitable for more water types, in open ocean
Fire fractional cover	4 - fair	Cloud sensitive.. Coarse spatial resolution.	VIS and TIR channels
Land surface temperature	4 - fair	Cloud sensitive.	TIR split window channels around 11 micrometers for water vapour correction
Leaf Area Index (LAI)*	4 - fair	Cloud sensitive.. Daylight only.	VIS and NIR channels. LAI inferred from NDVI
Ocean chlorophyll concentration *	4 - fair	Cloud sensitive.. Daylight only.	Many narrow-bandwith VIS channels, suitable for more water types, in open ocean
Ocean Diffuse Attenuation Coefficient (DAC)*	4 - fair	Cloud sensitive.. Daylight only.	Many narrow-bandwith VIS channels, suitable for more water types, in open ocean
Ocean suspended sediments concentration*	4 - fair	Cloud sensitive.. Daylight only.	Many narrow-bandwith VIS channels, suitable for more water types, in open ocean
Sea surface temperature*	4 - fair	Cloud sensitive.	TIR split window channels around 11 micrometers for water vapour correction
Snow cover	4 - fair	Cloud sensitive.. Daylight only.	VIS and NIR channels
Soil moisture at surface	4 - fair	Cloud sensitive.. Index only.	VIS and TIR window channels. Soil moisture inferred from thermal inertia
Integrated Water Vapour (IWV)	4 - fair	Cloud sensitive.. Low troposphere dominant.	TIR channels in the 11 micrometers split window
Sea-ice cover	4 - fair	Cloud sensitive.	VIS, NIR (for contour enhancement) and TIR channels
Biomass*	5 - marginal	Cloud sensitive.. Index only.. Daylight only.	VIS and NIR channels. Biomass inferred from NDVI
Downward short-wave irradiance at Earth surface	5 - marginal	Cloud sensitive.. Highly indirect.	VIS and NIR channels
Earth surface albedo*	5 - marginal	Cloud sensitive.	VIS channels
Fire radiative power	5 - marginal	Cloud sensitive.. Coarse spatial resolution.	TIR channels
Fire temperature	5 - marginal	Cloud sensitive.. Coarse spatial resolution.	TIR channels
Oil spill cover*	5 - marginal	Cloud sensitive.. Daylight only.	VIS channels with narrow bandwidth
Short-wave cloud reflectance	5 - marginal	No specific limitation.	VIS and NIR channels
Upward short-wave irradiance at TOA	5 - marginal	Spectral interpolation needed.. Information on BRDF needed.	VIS and NIR channels
Wind (horizontal)	5 - marginal	Limited to high latitudes.. Cloud or water vapour tracers needed.	TIR channel(s) around 11 micrometers window

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