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@ARTICLE{Bayat:884846,
author = {Bayat, Bagher and Camacho, Fernando and Nickeson, Jaime and
Cosh, Michael and Bolten, John and Vereecken, Harry and
Montzka, Carsten},
title = {{T}oward operational validation systems for global
satellite-based terrestrial essential climate variables},
journal = {International journal of applied earth observation and
geoinformation},
volume = {95},
issn = {0303-2434},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2020-03283},
pages = {102240 -},
year = {2020},
abstract = {Terrestrial Essential Climate Variables, known as
terrestrial ECVs, are key sources of information for both
application- and scientific- oriented research. A large
number of global terrestrial ECV products have been derived
from satellite observations, and more are forthcoming. To
unlock the full potential of these products, end-users need
to know their uncertainties and error magnitudes. Due to the
lack of conformity among validation strategies, a wide range
of validation approaches have been employed to assess the
quality of these products, and have resulted in reduced
comparability even for the same terrestrial ECV. Addressing
this challenge in validation practices requires the use of
unified, standard, publicly available, traceable and
objective validation procedures that are operational for all
products of a specific terrestrial ECV, and preferably also
applicable for all ECVs at the global scale. This can allow
end-users to perform comparative assessments. To this end,
the current study aims to investigate the readiness status
of a selected group of seven global long-term
satellite-based terrestrial ECVs for operational validation.
Selected variables are Leaf Area Index (LAI), Land Surface
Temperature (LST), Evapotranspiration (ET), Soil Moisture
(SM), Albedo, the fraction of Absorbed Photosynthetically
Active Radiation (fAPAR), and Land Cover (LC). For each of
these terrestrial ECVs, we reviewed key prerequisites and
primary tools [notably, long term global product
availability, globally distributed in situ measurement
availability, a validation good practice protocol, and an
online validation platform] required for developing an
operational validation system. With respect to the
“readiness level”, the investigation results demonstrate
that LAI, SM, and LC are at the highest level of readiness
for moving toward a full operational validation at the
global scale. However, ET is at the lowest level of
readiness, mainly due to the lack of standard validation
good practice protocol and lack of a pilot online validation
platform. The remainder of the selected terrestrial ECVs are
identified to be at mid-level readiness, mainly because
either a validation platform (i.e., LST and albedo) or good
practice protocol (i.e., fAPAR) still needs to be developed.
This review can pave the way for open-access, traceable,
transparent, and operational validation procedures of
satellite-based global terrestrial ECVs.},
cin = {IBG-3},
ddc = {550},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000601280500003},
doi = {10.1016/j.jag.2020.102240},
url = {https://juser.fz-juelich.de/record/884846},
}