The
Sentinel‐2
mission
is
fully
operating
since
June
2017
with
a
constellation
of
two
polar
orbiting
satellite
units.
Both
Sentinel‐2A
and
Sentinel‐2B
are
equipped
with
an
optical
imaging
sensor
MSI
(Multi‐Spectral
Instrument)
which
acquires
high
spatial
resolution
optical
data
products.
The
Sentinel‐2
mission
serves
for
observation
of
land‐cover
change
and
deriving
biophysical
variables
related
to
agriculture
and
forestry,
monitors
coastal
and
inland
waters
and
is
useful
for
risk
and
disaster
mapping.
Atmospheric
correction
processor
Sen2Cor
was
developed
to
remove
the
effect
of
the
atmosphere
from
Sentinel‐2
data.
Sen2Cor
is
designed
for
mono‐temporal
processing
of
Sentinel‐2
L1C
data
products
providing
Level‐2A
Bottom‐of‐Atmosphere
(BOA)
reflectance
product
together
with
Aerosol
Optical
Thickness
(AOT),Water
Vapor
(WV)
and
Scene
Classification
(SCL)
maps.
Sen2Cor
can
be
downloaded
from
ESA
website
for
individual
processing
by
the
users.
In
parallel,
Sen2Cor
is
used
by
ESA
for
systematic
L2A‐processing
of
Sentinel‐2
acquisitions
over
Europe
since
June
2017.
ESA
is
preparing
an
operational
global
L2A‐processing
with
the
integration
of
Sen2Cor
in
Sentinel‐2
ground
segment
(PDGS).
The
presentation
provides
recent
validation
results
for
the
BOA
reflectance
product
focusing
on
vegetated
areas.
Accuracy
represents
the
mean
difference
of
BOA‐reflectance
retrieval
to
a
reference
value
and
uncertainty
gives
the
rms
around
the
reference.
BOA‐reflectance
reference
is
computed
from
Sentinel‐2
L1C
Top‐of‐Atmosphere
products
using
a
radiative
transport
model
with
AERONET
aerosol
data
as
an
input.