Digital Signal Processing Reference
In-Depth Information
APPENDIX (A-3)
ENVISAT Medium-Resolution Imaging Spectrometer (MERIS)
Launched in 2002, ENVISAT is the largest Earth Observation spacecraft ever built. It carries ten
sophisticated optical and radar instruments to provide continuous observation and monitoring of the
Earth's land, atmosphere, oceans and ice caps. Envisat data collectively provide a wealth of
information on the workings of the Earth system, including insights into factors contributing to climate
change. The Medium Resolution Imaging Spectrometer (MERIS) is a imaging spectrometer that
measures the solar radiation reflected by the Earth, at a ground spatial resolution of 300 m, with 15
spectral bands in visible and near infra-red and programmable in width and position. MERIS allows
global coverage of the Earth every 3 days.
The primary mission of MERIS is the measurement of sea colour in oceans and coastal areas.
Knowledge of sea colour can be converted into a measurement of CHL-aorophyll pigment
concentration, suspended sediment concentration and aerosol loads over marine areas. It is also used
for land and atmospheric monitoring.
MERIS products
The MERIS Level 1 products provide the radiance as measured by the instrument. The can be used to
construct colour composite images, either giving a photographic impression or highlighting certain
thematic features of the Earth, and they are input to processing algorithms to derive Level 2 products.
The MERIS level 2 products provide geophysical information ready to be used for various
applications. The primary mission of MERIS is to monitor the ocean colour including CHL-aorophyll
concentrations for open oceans and coastal areas, yellow total suspended matter. In addition, MERIS
provides with land parameter measurements like vegetation indices and atmospheric parameters like
water vapour, cloud top pressure, cloud types, aerosol optical thickness, and Angström coefficients.
MERIS Full Resolution products
Image size of MERIS products
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