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TROPOMI surface LER & DLER database |
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![]() Tropospheric
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NO2
- global CH2O - global CO - global |
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UV
- UV index - UV dose |
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Ozone
- total column - global field - ozone bulletin - ozone profiles - tropospheric |
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Aerosol
- ADRE - aerosol index Methane - global CO2 - global Clouds - cloud info Surface - solar irradiance |
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Volcanic plume
- SO2 & AAI |
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Albedo
- climatologies Fluorescence - sun-induced |
The TROPOMI surface DLER database contains the Lambertian-equivalent
reflectivity (LER) of the Earth's surface at 21 one-nm wide wavelength
bins between 328 and 2314 nm. Next to the traditional non-directional
LER field, the database contains the directionally dependent
Lambertian-equivalent reflectivity (DLER) of the surface. In the DLER,
the viewing-angle dependence of the surface reflectance, due to the BRDF
of the surface, is taken into account, which improves the surface
reflectance considerably, especially for the longer wavelengths.
The (D)LER albedo values were derived from TROPOMI data using the
Doubling-Adding KNMI (DAK) polarised radiative transfer code. The model
consists of an atmosphere for which Rayleigh scattering and ozone
absorption are taken into account, and which is bounded below by a
Lambertian surface. The surface (D)LER is available for each month of
the year and for the following wavelengths: 328, 335, 340, 354, 367,
380, 388, 402, 416, 425, 440, 463, 494, 670, 685, 697, 712, 747, 758,
772, and 2314 nm. These wavelength bands are more or less monochromatic
(one nm wide in most cases) and suitable as input for the retrieval of
most atmospheric species. The resolution of the database grid is
0.125°×0.125°.
Archive:
The following database based on TROPOMI observations is available:
TROPOMI_Sentinel-5P_0125x0125_surface_DLER_v1.1.nc (14 GB)
Previous versions of the databases can be downloaded here.
The format and the contents of the files are explained here. The current version of the
database is 1.1. This version is based on 36 months of TROPOMI v1.0.0
level-1b data.
Origin / Creator:
The TROPOMI surface DLER database is provided by KNMI in the framework
of the Sentinel-5p+
Innovation project led by ESA.
Data use /
License / Citation:
The TROPOMI surface DLER database is free to use for commercial and
non-commercial purposes. If you use the database for a publication
(research or otherwise), or for any other purpose, please refer to the
following publication:
L.G. Tilstra, TROPOMI ATBD of the directionally dependent surface
Lambertian-equivalent reflectivity, KNMI Report S5P-KNMI-L3-0301-RP,
Issue 1.2.0, January 13, 2022 (PDF)
We suggest that you include the following acknowledgement: "We
acknowledge the free use of the TROPOMI surface DLER database provided
through the Sentinel-5p+ Innovation project of the European Space Agency
(ESA). The TROPOMI surface DLER database was created by the Royal
Netherlands Meteorological Institute (KNMI)."
Documentation: