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 (Braodband Directional Reflectance) 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
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| Previously used record identifiers: |
No related previous identifiers.
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| Access rules: |
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: http://www.globalbedo.org/copyright.php. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record. |
| Data lineage: |
Data were produced by the GlobAlbedo project participants and are archived by CEDA |
| Data Quality: |
quality for globalbedo_broadband_brdf
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| File Format: |
The data are netCDF formatted, and are compressed in gzip format
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Related Documents
| GlobAlbedo Product User Guide |
| GlobAlbedo website |
| GlobAlbedo ATBD V3.1 |
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 |
Instrument/Platform pairings
| High Resolution Visible Imaging Instrument (HRV) | Deployed on: SPOT (Earth Observing Satellites) Earth Observation System |
Mobile platform operations
| Mobile Platform Operation 1 | Mobile Platform Operation for: SPOT (Earth Observing Satellites) Earth Observation System |
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° |
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-180.0000° |
180.0000° |
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-90.0000° |
Related parties