Project Description
Database to simulate spectro-directional reflectance of the Earth surface
The ADAM climatological database and toolkit developed by NOVELTIS enable the calculation of realistic narrow-band reflectance values over the spectral 240-4000 nm range (at 1 nm spectral resolution) and in any observation geometry, at 0.1° x 0.1° (≈10 x 10km) spatial resolution.
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Database to simulate spectro-directional reflectance of the Earth surface
The ADAM climatological database and toolkit developed by NOVELTIS enable the calculation of realistic narrow-band reflectance values over the spectral 240-4000 nm range (at 1 nm spectral resolution) and in any observation geometry, at 0.1° x 0.1° (≈10 x 10km) spatial resolution.
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Means used
For land surfaces (sol, vegetation, snow), the data consist in a monthly climatology (for a typical year) of normalized reflectances (i.e. corrected from the directional effects) derived from MODIS observations in seven bands (visible to near infrared). Specific algorithms have been developed to interpolate/extrapolate the reflectance data over the wide 240-4000 nm spectral range at 1 nm resolution, and then to simulate the surface directional signature.
Over oceans and lakes, the algorithms relies on chlorophyll products (from the SeaWiFS instrument) to simulate the spectral variation of water reflectance, and on wind speed data (from the QuikScat instrument) to simulate the directional variations.
A dedicated web site (https://adam.noveltis.fr/) has been designed by NOVELTIS to provide access to the database and toolbox, while also enabling online calculations and display.
Results
ADAM climatological database, representative of year 2005 over land and 1999-2009 over ocean provided at monthly / 0.1° resolutions in netCDF-4 files
• ADAM calculation toolkit enabling calculation of the spectro-directional variation of Earth surface reflectance over the 240-4000 nm spectral range (1 nm resolution) and in any observation geometry depending on user’s choices.
ADAM web portal offers user-friendly functionalities, including the possibility to visualize monthly reflectance maps and to perform online calculations.
Assessment of the ADAM products against PARASOL multispectral/multidirectional observations over several land surface classes over year 2008.
It will help support the design of processing chains for atmospheric parameter retrievals (concentrations of aerosol, trace gaz, etc.) from remotely sensed observations in the UV to near infrared.