THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
Measurements > Ocean >
Ocean colour/biology >
Color dissolved organic matter (CDOM)


Measurement Definition*: Former name: “Yellow substance absorbance”. Parameter extracted from ocean colour observation. Indicative of biomass undergoing decomposition processes. Requested in both open ocean and coastal zone - Physical unit: [ m-1 ] - Accuracy unit: [ % ] at a specific concentration (e.g., 1 m-1).
InstrumentStatus/
Accuracy
Instrument DescriptionMeasurement TechnologyTimeline
CHRIS
Compact High Resolution Imaging Spectrometer
Operational
+/-0 m-1
Supports a range of land, ocean and atmospheric applications, including agricultural science, forestry, environmental science, atmospheric science and oceanography.n/a
HSI (HJ-1A)
Hyper Spectrum Imager
Operational
Hyperspectral measurements for environment and disaster management operations.Multi-purpose imaging Vis/IR radiometer
MERSI-2
Improved Medium Resolution Spectral Imager
Operational
Measurement of vegetation indexes and ocean colour.Multi-purpose imaging Vis/IR radiometer
MODIS
MODerate-Resolution Imaging Spectroradiometer
Operational
Data on biological and physical processes on the surface of the Earth and in the lower atmosphere, and on global dynamics. Surface temperatures of land and ocean, chlorophyll fluorescence, land cover measurements, cloud cover (day and night).n/a
OLCI
Ocean and Land Colour Imager
Operational
Marine and land services.n/a
SGLI
Second-generation Global Imager
Operational
+/-100 %
Medium resolution multi-spectral imaging of land, ocean and atmosphere. SGLI-VNR is an optical sensor capable of multi-channel nadir observation at wavelengths from near-UV to NIR and forward or backward polarization observation at red and near infrared wavelengths (Push-broom scanning). SGLI-IRS is an optical sensor capable of multi-channel nadir observation at wavelengths from SWIR to TIR wavelengths (Cross-track scanning).n/a
NIR-SWIR
Multi-spectral Optical Camera - Near & Short Wave Infrared
Approved
Ocean Colour - Open ocean, coastal & in-land waters. Atmospheric correctionsn/a
MERSI-S
Improved Medium Resolution Spectral Imager - Simplified
Proposed
Measurement of vegetation indexes and ocean colour.Multi-purpose imaging Vis/IR radiometer
Multi-band UV/VIS Spectrometer (ACE)
Multi-band UV/VIS Spectrometer (ACE)
Proposed
Ocean colour spectrometer for measuring ocean leaving light which contains information on biological components.n/a
MERSI
Medium Resolution Spectral Imager
No longer operational
Measurement of vegetation indexes and ocean colour. No longer operating due to lack of power.Multi-purpose imaging Vis/IR radiometer
* Description adapted from WMO.
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