1. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
The
CEOP-­‐AEGIS
Data
Portal
tutorial
http://dataportal.ceop-­‐aegis.org
J.COLIN
Image
Sciences,
Computer
Sciences
and
Remote
Sensing
Laboratory,
CNRS
/
University
of
Strasbourg,
France,
j.colin@unistra.fr
Version
:
1.0.2
Introduction
During
this
tutorial,
you
will
be
guided
step
by
step
to
discover
the
portal,
display
data,
get
information,
perform
queries
and
export
results.
To
complete
this
tutorial,
you
will
need
to
have
an
Internet
browser.
We
recommend
you
to
use
Firefox
for
better
compatibility.
Also
ensure
that
you
have
a
good
Internet
access.
This
tutorial
is
organized
in
five
parts.
The
first
part
will
explain
you
how
to
access
the
portal,
and
will
let
you
discover
the
interface.
The
second
part
will
introduce
navigating
through
products,
variables
and
meta-­‐data.
The
third
part
will
focus
on
visualizing
and
mapping
a
product,
animating
time
series,
visualizing
in
situ
data.
The
fourth
part
will
explain
you
have
to
perform
advanced
queries
in
space
and
time.
The
last
part
will
present
you
how
to
export
datasets
and
subsets
to
your
computer
for
further
analysis.
This
tutorial
ends
with
a
few
exercises
to
allow
you
to
test
your
understanding
of
the
use
of
the
portal.
Username: dchart
Important:
The
access
to
the
portal
may
require
a
Password: #dchart!
username
and
password.
Please
ensure
to
have
this
information
with
you
before
you
start.
!

2. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
The
Map
component
When
you
enter
the
data
portal,
you
will
access
a
web
page
containing
various
components.
The
first
component
is
the
map
window.
By
default,
the
map
window
shows
you
a
view
of
the
entire
world.
On
the
left
side
of
the
map,
you
can
see
a
group
of
buttons.
If
you
move
your
mouse
cursor
above
a
button,
you
will
see
some
explanations
showing
up.
The
map
window
allows
performing
to
different
operations.
First,
it
will
show
you
the
actual
extent
of
a
dataset,
or
the
location
of
a
ground
station.
Second,
it
will
allow
you
to
define
your
own
area
of
interest.
!

3. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
To
select
an
area
of
interest,
use
the
“set
region”
mode
by
click
on
the
following
button:
To
drag
the
map,
use
the
other
“hand”
button:
When
you
use
the
map
window,
you
have
two
modes.
They
can
be
activated
using
the
two
buttons
on
top
left.
Using
the
square
button,
you
can
select
an
area
of
interest
on
the
map.
Using
the
hand
button,
you
can
drag
the
map
with
the
mouse.
The
arrows
buttons
are
used
to
navigate
in
the
map.
The
plus
and
minus
button
are
used
to
zoom
in
and
zoom
out.
The
Dataset
component
The
second
component
is
the
dataset
window.
A
dataset
is
a
registered
source
of
data.
Each
dataset
is
belonging
to
a
category.
You
will
find
datasets
belonging
to
atmosphere,
hydrology,
land
and
in
situ.
!

4. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
The
atmosphere
category
groups
numerical
weather
prediction
model
outputs.
You
will
mainly
find
data
provided
by
the
grapes
model
of
the
Chinese
Meteorological
Administration.
The
hydrology
category
groups
both
hydrological
model
outputs
and
remote
sensing
products
on
early
warning.
Early
warning
products
concern
either
drought
or
flood.
The
land
category
groups
remote
sensing
based
products.
These
products
are
time
series
of
vegetation
properties,
land
surface
albedo
and
temperature.
The
in
situ
category
groups
any
ground
observation
data.
To
work
with
a
given
dataset,
simply
click
on
one
of
them.
When
a
dataset
is
selected,
the
available
variables
will
appear
in
the
variable
window
on
the
right
end
side
of
the
portal.
To
obtain
some
information
about
a
dataset,
you
can
click
on
its
name.
Information
will
be
displayed
in
a
new
navigator
window.
Once
you
have
consulted
this
information,
feel
free
to
close
this
window.
The
variable
component
displays
all
the
variables
contained
in
the
selected
dataset.
A
dataset
may
only
contain
one
variable,
or
dozens.
!

5. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
Display
and
animate
GRAPES
data
Let’s
make
an
example.
To
see
some
atmosphere
data,
you
can
simply
select
the
atmosphere
category.
In
the
variable
panel,
select
the
air
temperature
at
the
height
of
the
boundary
layer.
Then
click
on
the
button
called
plot
selected.
You
can
find
this
button
on
top
of
the
datasets
window,
and
on
the
toolbar
in
the
bottom
of
your
web
browser
window.
The
result
will
appear
in
the
figure
component,
below
the
map
component.
The
figure
displays
the
dataset
name,
the
date
and
time,
as
well
as
the
variable
name,
unit
and
colour
ramp.
!

6. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
Remember
than
each
dataset
is
a
time
series
of
a
given
variable.
Therefore,
you
can
visualize
the
evolution
of
a
variable
with
time.
Below
the
figure
window,
you
will
see
three
blue
buttons.
They
allow
you
to
mover
backward,
play,
and
move
forward
in
time.
For
an
example,
click
on
the
play
button
to
see
how
the
air
temperature
behaves
in
time.
The
time
is
displayed
in
the
title
of
the
figure.
For
an
example,
the
grapes
data
are
stored
every
30
minutes.
To
stop
the
animation,
click
on
the
same
button.
The
next
part
of
the
tutorial
will
introduce
you
to
more
advances
features
of
the
portal.
Customize
2D
maps
Let’s
move
to
the
other
components
of
the
portal.
On
the
right
of
the
figure
window,
you
will
see
a
plot
type
component.
This
allows
you
to
make
various
kinds
of
plot.
!

7. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
The
shaded
2D
plot
is
the
standard
map
representation.
If
you
check
filled
2D
contour
plot,
you
need
to
refresh
the
figure
by
clicking
on
the
plot
selected
button
again.
Plot
2D
subset
Each
dataset
has
its
own
coverage.
The
extent
of
each
data
may
vary
a
little.
When
you
select
a
dataset,
the
extent
is
displayed
on
the
map.
Click
on
each
dataset
to
see
the
actual
coverage.
You
may
well
be
interested
to
see
only
a
subset
of
the
available
area.
To
do
so,
you
have
two
possibilities.
The
first
is
to
select
your
own
area
of
interest
by
dragging
the
mouse
on
the
map.
Remember
that
you
must
stay
within
the
actual
coverage
of
the
dataset.
!

8. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
For
an
example,
select
the
second
dataset
in
the
hydrology
category.
The
variable
stored
in
this
dataset
is
the
routed
river
discharge.
In
other
words,
it
displays
the
flow
of
rivers
in
cubic
meters
per
seconds
as
computed
by
the
hydrological
model.
Click
on
the
plot
selected
button.
You
will
see
the
entire
area
covered
by
the
data
by
default.
Now
make
a
subset
over
the
eastern
part
of
the
Himalaya,
and
click
on
the
plot
selected
button
to
refresh
again.
You
now
have
a
close
up
view
of
your
data.
You
can
make
an
animation
to
see
how
it
behaves
with
time.
The
second
way
to
make
a
spatial
subset
is
to
use
the
ranges
component
on
the
bottom
right
of
the
portal.
The
ranges
component
allow
you
to
manually
refine
the
range
in
latitude
and
longitude.
There
you
can
manually
enter
the
coordinates
of
your
area
of
interest,
or
use
the
sliders.
The
same
way,
you
can
navigate
in
time
by
either
defining
manually
the
dates
and
hours,
or
use
the
slider.
Be
aware
that
the
date
and
time
syntax
must
fit
with
the
template.
Otherwise,
you
would
get
an
error.
It
is
often
simpler
to
use
the
slider.
1D
plot
over
latitude
and
longitude
These
two
2D
map
functions
make
traditional
map
views.
Now,
let’s
make
one-­‐
dimensional
plots.
A
one-­‐dimensional
plot
allows
you
to
view
a
variable
in
a
latitude-­‐
time
or
longitude-­‐time
representation.
This
is
particularly
useful
to
see
the
time
evolution
over
a
range
of
latitude
or
longitude.
Please
note
that
when
you
select
a
one-­‐dimensional
plot,
the
selected
area
will
change
on
the
map
to
reflect
the
location
of
the
selection.
If
you
wish
to
change
it,
simply
use
the
set
region
button
and
drag
your
mouse
over
the
area
of
interest.
!

9. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
Let’s
make
an
example.
Select
the
first
dataset
of
the
hydrology
category.
This
dataset
contains
specific
runoff
data.
Now
let’s
make
a
plot
showing
the
variation
of
the
specific
runoff
from
West
to
East
of
the
Tibetan
plateau
at
a
latitude
of
28
degrees
North.
Select
the
1D
line
plot
as
plot
type,
then
select
make
an
East-­‐West
selection
on
the
southern
part
of
the
plateau.
You
area
of
interest
will
look
like
a
line.
Now
if
you
click
on
the
plot
selected
button
to
refresh
the
figure,
you
will
obtain
a
line
plot
of
the
specific
runoff
from
West
to
East.
If
you
use
the
blue
play
button,
you
will
see
the
evolution
of
the
plot
with
time.
!

10. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
Take
some
time
to
make
some
tests.
And
remember,
each
time
you
change
the
type
of
plot,
the
area
of
interest
or
the
variable,
you
have
to
click
on
the
plot
selected
button
to
refresh
the
figure.
1D
plot
of
LAI
In
the
plot
view
component,
you
will
notice
that,
below
latitude
and
longitude,
you
can
also
select
time.
To
try
this,
let’s
first
select
the
leaf
area
index
product
of
the
land
category.
Then
we
select
the
one-­‐dimensional
line
plot,
then
the
time
plot
view.
!"

11. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
You
will
notice
that
the
area
of
interest
has
become
smaller
on
the
map.
The
selection
actually
covers
one
grid
of
data.
Therefore,
in
this
configuration,
the
plot
will
show
you
the
time
evolution
of
the
leaf
area
index
at
the
location
on
the
map.
Click
on
the
map
to
define
a
location,
then
use
the
plot
selected
button
to
refresh
What
you
see
now
is
the
line
plot
showing
the
evolution
of
the
vegetation
for
the
entire
period
of
time
recorded
in
the
dataset.
Plot
of
in
situ
data
Now
let’s
visualize
some
in
situ
data.
In
situ
data
are
ground
measurements
performed
at
one
location.
These
data
offer
fewer
representation
options,
because
they
are
one-­‐
dimensional
by
nature.
!!

12. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
If
you
select
the
in
situ
dataset
call
Lhasa
ground
station
data
2010,
you
will
see
that
the
plot
types
proposed
are
limited
to
one-­‐dimensional
plots.
The
2D
plots
are
not
proposed
anymore.
In
the
variables
component,
you
can
see
four
variables.
These
are
longwave
and
shortwave
radiation
incoming
and
outgoing
from
the
land
surface.
Let’s
select
the
longwave
downward
variable
and
click
on
the
plot
selected.
In
the
figure,
you
now
see
the
entire
time
series
of
this
measurement.
!"

13. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
To
identify
the
location
of
this
station,
have
a
look
at
the
map.
You
should
see
a
red
dot
with
a
yellow
circle.
You
can
also
get
the
actual
coordinates
of
this
station
below
the
map.
The
text
shows
the
station
name,
as
well
as
the
latitude,
longitude,
altitude
in
meter,
and
starting
date.
Subsets
in
time
You
may
wish
to
see
a
variable
for
a
given
range
of
dates.
For
an
example,
select
the
shortwave
downward
variable
and
plot
it.
!"

14. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
Each
pick
is
a
day,
starting
from
April
third.
Let’s
say
that
we
want
to
display
only
a
few
days
around
April
seventh.
On
the
right
of
the
plot
type
component,
you
can
see
a
station
filter
component.
The
latitude,
longitude
and
altitude
filters
are
fixed
to
the
station.
But
the
time
filter
gives
you
a
range
of
dates.
You
can
use
the
sliders
to
change
the
interval.
Now
let’s
set
the
time
range
from
April
seventh
to
April
ten.
Then
click
on
the
plot
selected
button.
You
should
now
see
three
days
of
data,
with
three
picks.
Download
the
sample
data
Now
let’s
say
that
we
want
to
export
these
data
to
make
further
analysis.
In
the
plot
type
component,
select
the
download
data
entry.
!"

15. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
Once
selected,
you
will
see
a
new
component
on
the
bottom
right.
This
component
is
called
data
download
format.
Select
the
comma
separated
option,
then
click
on
the
usual
plot
selected
button.
The
download
window
of
your
Internet
browser
will
pop
up.
Save
this
file
on
your
desktop.
The
file
you
got
is
a
text
file.
The
data
are
stored
in
comma
separated
format.
You
can
open
this
file
in
Microsoft
Excel,
and
make
your
own
statistics
and
plots.
!"

16. The
CEOP-­‐AEGIS
Data
Portal
Tutorial
Version
1.0.2
Jérôme
Colin
Exercises
Exercise
1:
Make
a
map
of
specific
runoff
for
the
1st
of
June
2008
over
the
area
ranging
from
90
to
100
East,
and
26
to
33
North.
Exercise
2:
Make
a
plot
of
routed
river
discharge
values
at
the
point
location
(26.00N-­‐97.70E)
for
the
entire
year
2009.
Exercise
3:
What
is
the
highest
value
of
specific
humidity
at
point
location
(32.2N-­‐92.0E)
between
October
12th
and
October
14th
2008
?
Exercise
4:
Export
values
of
shortwave
and
longwave
incoming
radiation
at
Lhasa
station
for
the
month
of
May
2010
and
make
your
own
plot
in
Microsoft
Excel.
!"