## 7 Conclusions
This work was funded by the European Centre for Medium-Range Weather Forecasts in the framework of the Copernicus Climate Change Service (Official reference number service contract: 2018/C3S_312b_Lot5_VITO/SC1), led by VITO as the prime contractor. Previously, the development of the algorithm and the methodology were defined in the framework of the Copernicus Global Land Service (European Commission/Joint Research Center under Framework Service Contract N\({}^{\circ}\)199494). This study has been undertaken using data from GBOV \"Ground Based Observation for Validation\" ([[https://land.copernicus.eu/global/gbov](https://land.copernicus.eu/global/gbov)]([https://land.copernicus.eu/global/gbov](https://land.copernicus.eu/global/gbov))) founded by the European Commission Joint Research Centre FWC932059 as part of the Global Component of the European Union's Copernicus Land Monitoring Service. The authors declare no conflict of interest. The following abbreviations are used in this manuscript: \begin{tabular}{l l} AL-DH & Directional-Hemispherical ALbedos \\ AL-BH & Bi-Hemispherical Albedos \\ ATBD & Algorithm Theoretical Basis Document \\ AVHRR & Advanced Very High Resolution Radiometer \\ BB & total shortwave \\ BRDF & Bidirectional Reflectance Distribution Function \\ BSA & Black-Sky Albedo \\ BSRN & Baseline Surface Radiation Network \\ CDR & Climate Data Records \\ CDS & Climate Data Store of C3S \\ CEOS & Committee on Earth Observing Satellites \\ CGLS & Copernicus Global Land Service \\ C3S & Copernicus Climate Change Service \\ C6 & Collection 6 of MODIS products \\ ECV & Essential Climate Variables \\ EO & Earth Observation \\ EQC & Evaluation and Quality Control \\ EUMETSAT & European Organization for the Exploitation of Meteorological Satellites \\ FLUXNET & FLUXes NETwork (network of regional networks) \\ \end{tabular}   
GBOV  
Ground-Based Observations for Validation  
CGOS  
Global Climate Observing System  
GLASS  
Global Land Surface Satellite  
GSD  
Ground Sampling Distance  
JCGM  
Joint Committee for Guides in Metrology  
KPI  
Key Performance Indicator  
LANDVAL  
LAND VALidation network  
LSA SAF  
Satellite Application Facility for Land Surface Analysis  
LPV  
Land Product Validation sub-group  
MAR  
Major Axis Regression  
MCD43  
TERRA+AQUA MODIS BRDF/Albedo/NBAR Product  
MetOp  
Polar-orbiting Meteorological satellites  
MIR  
Mid InfraRed  
MODIS  
MODerate resolution Imaging Spectroradiometer  
MSG  
Meteosat Second Generation  
N  
Number of samples  
NASA  
National Aeronautics and Space Agency  
NEON  
National Ecological Observatory Network  
NIR (or NI)  
Near-Infrared  
NOAA  
National Oceanic and Atmospheric Administration  
OLCI  
Ocean and Land Colour Instrument  
OLS  
Ordinary Least Squares  
LP  
Land Products  
PROBA-V  
Project for Onboard Autonomy satellite, the V standing for vegetation  
PUGS  
Product User Guide and Specification document  
QFLAG  
Quality FLAG  
R
Correlation coefficient  
RM  
Reference Measurements  
RMSD  
Root Mean Square Deviation  
RTLSR  
Ross Thick kernel and Li Sparse-Reciprocal kernels  
SA  
Surface Albedo  
SEVIRI  
Spinning Enhanced Visible and Infrared Imager  
SLSTR  
Sea and Land Surface Temperature Radiometer  
SPOT  
Satellites for the Observation of the Earth  
SURFRAD  
Surface Radiation budget  
SWIR  
Short-Wave InfraRed  
TOA  
Top-Of-Atmosphere  
TOC  
Top-Of-Canopy  
VGT  
VeGeTation sensor  
VI  
Visible domain  
VNIR  
Visible and Near-InfRared  
WGCV  
Working Group on Calibration and Validation  
WMO  
World Meteorological Organization  
WSA  
White-Sky Albedo