This Algorithm Theoretical Basis Document (ATBD) describes the Joint Research Centre (JRC)- procedure used to retrieve information of absorbed photosynthetical radiation by the vegetated terrestrial surfaces from an analysis of the Top Of Atmosphere (TOA) data acquired by the future Ocean Land Colour Instrument (OLCI).
The purpose of this algorithm is to determine the correction for NIR reflectance needed for the full atmosphere correction model - applied to visible wavelengths.
This document presents the Algorithm Theoretical Basis Document (ATBD) for the retrieval of Land Surface Temperature (LST) from thermal radiances measured by the Sea and Land Surface Temperature Radiometer (SLSTR).
This document describes the theory for the prototype multi-channel active fire detection and fire characterisation algorithm for use with data from the SLSTR sensor onboard the ESA Sentinel-3 satellite.
This document describes the physical and statistical basis for estimation of Sea Surface Temperature (SST) and associated errors in SST, for products of the SLSTR instrument.
The purpose of this document is to lay out algorithms for the sea water transparency products.
This Algorithmic Theoretical Basis Document (ATBD) describes the algorithm used to estimate chlorophyll content over land from Level-1 OLCI products from the Sentinel-3 mission. The algorithm called the OLCI Terrestrial Chlorophyll Index (OTCI) is a unique chlorophyll index for OLCI data. This document identifies the source of input data; outlines the physical principles and mathematical background; justifies this algorithm and then explores its limitations and assumptions.
Photosynthetically Active Radiation (PAR) reaching the ocean surface is defined as the quantum energy flux from the Sun in the spectral range 400-700 nm; units are Einstein/m2/day. PAR is essential for the carbon-cycle modellers to convert the measured chlorophyll concentration into an estimate of ocean productivity, and hence of carbon sequestration.
The purpose of this ATBD is to define the approach to white cap correction that could be applied to OLCI.
This document aims at providing a comprehensive description of the OLCI instrument's spectral characteristics and their potential impact on algorithms likely to expect data acquired at a constant wavelength.
It describes an algorithm that (a) properly accounts for the instrument spectral characterisation to convert TOA radiances into TOA reflectances and (b) provides a first order correction of the TOA reflectance for the wavelength variation, accounting for the surface underneath.
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