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ADAM Surface Reflectance Database v4.0

Data

21 Feb 2020

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blue arrow DESCRIPTION

ADAM enables generating typical monthly variations of the global Earth surface reflectance at 0.1° spatial resolution (Plate Carree projection) and over the spectral range 240-4000nm.

The ADAM product is made of gridded monthly mean climatologies over land and ocean surfaces, and of a companion API toolkit that enables the calculation of hyperspectral (at 1 nm resolution over the whole 240-4000 nm spectral range) and multidirectional reflectances (i.e. in any illumination/viewing geometry) depending on user choices.

The ADAM climatologies that feed the ADAM calculation tools are:

For ocean:

  • monthly chlorophyll concentration derived from SeaWiFS-OrbView-2 (1999-2009); it is used to compute the water column reflectance (which shows large spectral variations in the visible, but is insignificant in the near and mid infrared).
  • monthly wind speed derived from SeaWinds-QuikSCAT-(1999-2009); it is used to calculate the ocean glint reflectance.

For land:

  • monthly normalized surface reflectances in the 7 MODIS narrow spectral bands derived from FondsdeSol processing chain of MOD09A1 products (derived from Aqua and Terra observations), on which relies the modelling of the hyperspectral/multidirectional surface (soil/vegetation/snow) reflectance.
  • uncertainty variance-covariance matrix for the 7 spectral bands associated to the normalized surface reflectance.

For sea-ice:

Sea ice pixels (masked in the original MOD09A1 products) have been accounted for by a gap-filling approach relying on the spatial-temporal distribution of sea ice coverage provided by the CryoClim climatology for year 2005.

blue arrow DETAILS

blue arrow DATA SET SPECIFICATIONS

Digital Object Identifier (DOI): 10.5270/esa-6riial9

Spatial coverage: 

90 N, -90 S, -180 W, 180 E

Temporal coverage:

2005-01-01 - 2005-12-31

Date of launch:
1999-06-19, 1999-12-18, 2002-05-04
Operators:
NASA
Mission status:
historicalArchive

Current Processor Version: 4.0

Resolution:

Very Low Resolution - VLR (> 1200 m)

Wavelengths: UV (0.01 - 0.4 µm), VIS (0.40 - 0.75 µm), NIR (0.75 - 1.30 µm), SWIR (1.3 - 3.0 µm), MWIR (3.0 - 6.0 µm)

blue arrow PROCESSING LEVEL

level 3,

blue arrow HOW TO ACCESS THIS DATA

blue arrow APPLICABLE TERMS & CONDITIONS

Utilisation of this data is subject to the ESA Contract condition, as described during registration and in the data disclaimer / data use policy on the web site

READ T&C

blue arrow RESOURCES

ADAM Database
Software Tool
ADAM Algorithm Theoretical Basis Document
Technical Note
ADAM, description of the web interface. Structure of the ADAM input surface database and output products
Technical Note
ADAM Final Report, Contract Change request 6
Technical Note
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