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Dataset

 

ESA GlobAlbedo Broadband BRDF (Bi-directional Reflectance Distribution Functions) inversion - Version 1.0

Update Frequency: Not Planned
Latest Data Update: 2015-09-22
Status: Completed
Online Status: ONLINE
Publication State: Preview
Publication Date:

THIS RECORD HAS NOT BEEN PUBLISHED YET - PREVIEW ONLY!
Abstract

As output from the BBDR to BRDF processing chain, a BRDF product is generated. This product contains all BRDF model parameters as derived from the Globalbedo inversion algorithm.

Spectral BRDF, is the fundamental description of surface reflectance, being the ratio of reflected spectral radiance (Wm-2sr-1nm-1) exiting around a direction vector Ω (relative to a surface normal vector) to the spectral irradiance (Wm-2nm-1) incident on the surface from direction Ω at some wavelength λ.

Citable as:  [ PROVISIONAL ] Muller, J.-P.; Kharbouche, S.; Lopez, G.; Shane, N.; Watson, G.; Lewis, P.; Danne, O.; Brockmann, C.; Kramer, U.; Zühlke, M.; Krueger, O.; Heckel, A.; North, P.; Guanter, L.; Fischer, J. (9999): ESA GlobAlbedo Broadband BRDF (Bi-directional Reflectance Distribution Functions) inversion - Version 1.0. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/4425b0c4e5b346008cd4b1a09b5b96e3
Abbreviation: Not defined
Keywords: ESA, GlobAlbedo, Albedo

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Please contact CEDA for information about how to access these data.
For data use licensing information please contact: support@ceda.ac.uk.
Data lineage:

Data were produced by the GlobAlbedo project participants and are archived by CEDA

Data Quality:
quality for globalbedo_broadband_brdf
File Format:
The data are netCDF formatted, and are compressed in gzip format

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Instrument/Platform pairings

Envisat - MERIS Deployed on: Envisat

Mobile platform operations

Mobile Platform Operation 1 Mobile Platform Operation for: Envisat

Computation Element: 1

Title GlobAlbedo processing chain
Abstract The GlobAlbedo project aims at generating multi-sensor multi-annual global land surface albedo products. MERIS and SPOT-VGT level-1 data serves as input data to a processing chain. The function of the processing chain can be summarised as:  processes every single input to some level in several processing steps.  accumulates at least one year of data for each 10º x 10º tile and then calculates products every 8 days as well as every month, as well as seasonal and annual products.  finally retrieves BRDF and albedo for each composite reporting time-step (every 8 days and every month, as well as seasonal and annual products). Firstly, all inputs are systematically processed from L1 to surface directional reflectances (SDR). The processing steps to retrieve SDRs are:  pixel classification for cloud, water, etc.. detection  retrieval of aerosol optical thickness  atmospheric correction using retrieved aerosol optical thickness The results are SDR values in the same granularity as the inputs. They are not written for distinct products, but just kept in memory and used as input to the next part of the processing chain. The processing steps are  broad-band integration of these SDRs  re-projection of these broad-band SDRs onto the MODIS Sinusoidal grid The results of this step are re-projected broadband directional reflectances (BBDR) still in the granularity of the input products. During implementation, it has been decided to store this intermediate product of BBDR tiles on disk, but to remove them subsequently after the BRDF computation (accumulation/inversion). The steps are:  computation of BRDFs every 8-days and every month of the broad-band BBDRs from all sensors by accumulation method, using an additional land cover mask information from Idepix  computation of the albedo from these BRDFs The final results are 8-day, monthly, seasonal, and annual composites of broadband albedo. For more information on the processing please see the product user guide and the ATBD in the docs tab.
Input Description None
Output Description None
Software Reference None
Output Description

None

Output Description

None

No variables found.

Coverage
Temporal Range
Start time:
1998-01-01T00:00:00
End time:
2011-12-27T23:59:59
Geographic Extent

 
90.0000°
 
-180.0000°
 
180.0000°
 
-90.0000°