Radiometric Calibration
PROBA-V QWG #2
PRESENTATION OUTLINE
» Introduction
» Stability of PROBA-V
» ICP updates since QWG#1
» Outlook
» Moon calibration GSICS activities
2
RC – IQC: Vicarious Calibration Concept
OSCAR* (Optical Sensor Calibration
with simulated Radiances)
Absolute
» Relies on combination of various
vicarious calibration methods to reduce
uncertainty in the calibration results
and to verify the different
requirements (5 % absolute, 3 %
relative)
Oceans
Dark current :
oceans during
night
Equalisation :
Antartica (VNIR)
Deserts (SWIR)
DC Clouds
Interband
Deserts
Temporal
*Sterckx et al. IJRS, 2014; Sterckx et al. , TGARS, 2013;
Govaerts et al., RSL, 2013
COMPLEXIY OF IN-FLIGHT VICARIOUS CALIBRATION OF PROBA-V
• Uncertainty in instaneous vicarious calibration results
• Some methods prone to seasonal dependent biases
 Large amount of vicarious calibrations are required to distinguish
an instrument related degradation trend from the ‘noise’
 Extra complexity due to design of PROBA-V
 3 cameras, 9 SWIR strips
 Large FOV (prone to BRF uncertainties)
4
TIME
REQUIRED
COMPLEXITY OF THE IN-FLIGHT CALIBRATION
Overlap
region
5
PRESENTATION OUTLINE
» Introduction
» Stability of PROBA-V
» VNIR
» SWIR
» ICP updates since QWG#1
» Outlook
» Moon GSICS activities
6
INSTRUMENT STABILITY : LEFT CAMERA
Results OSCAR Libya-4 (since October 2013) (no Ak updates considered)
Libya4 LEFT CAMERA: BLUE
Libya4 LEFT CAMERA: RED
1.2
1.2
% decrease since Oct 13: -2.89%
% decrease/year: -1.42%
1.15
1.1
DAk
1.1
DAk
% decrease since Oct 13: -1.51%
% decrease/year: -0.74%
1.15
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
0.8
0.8
% decrease since Oct 13: -2.80%
% decrease/year: -1.38%
SWIR1
SWIR2
1.15
SWIR3
1.1
DAk
1.1
DAk
O-15
S-15
A-15
Libya4 LEFT CAMERA: SWIR
1.2
1.15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
Libya4 LEFT CAMERA: NIR
1.2
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
7DATE
0.8
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
O-13
0.8
INSTRUMENT STABILITY : CENTER CAMERA
Results OSCAR Libya-4 (since October 2013) (no Ak updates considered)
Libya4 CENTER CAMERA: BLUE
Libya4 CENTER CAMERA: RED
1.2
1.2
% decrease since Oct 13: -0.07%
% decrease/year: -0.03%
1.15
1.1
1.1
DAk
DAk
% decrease since Oct 13: 1.14%
% decrease/year: 0.54%
1.15
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
0.8
0.8
SWIR2
1.15
SWIR3
1.1
DAk
1.1
DAk
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
SWIR1
1.2
% decrease since Oct 13: -0.34%
% decrease/year: -0.17%
1.15
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
Libya4 CENTER CAMERA: SWIR
Libya4 CENTER CAMERA: NIR
1.2
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
8
0.8
O-13
0.8
INSTRUMENT STABILITY : RIGHT CAMERA
Results OSCAR Libya-4 (since October 2013) (no Ak updates considered)
Libya4 RIGHT CAMERA: BLUE
Libya4 RIGHT CAMERA:RED
1.2
1.2
% decrease since Oct 13: -1.14%
% decrease/year: -0.56%
1.15
1.1
DAk
1.1
DAk
% decrease since Oct 13: -0.36%
% decrease/year: -0.18%
1.15
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
0.8
0.8
1.2
% decrease since Oct 13: -1.31%
% decrease/year: -0.64%
SWIR1
SWIR2
1.15
SWIR3
1.1
DAk
1.1
DAk
O-15
S-15
A-15
Libya4 RIGHT CAMERA: SWIR
1.2
1.15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
Libya4 RIGHT CAMERA: NIR
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
9
DATE
0.8
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
O-13
0.8
DATE
INSTRUMENT STABILITY : SUMMARY VNIR
LEFT
BLUE
NIR
RED
since Oct2013 per year since Oct2013 per year since Oct2013 per year
-2.73%
-1.42%
-2.64%
-1.38%
-1.43%
-0.74%
CENTER
-0.07%
-0.03%
-0.34%
-0.17%
1.14%
0.54%
RIGHT
-1.14%
-0.56%
-1.31%
-0.64%
-0.36%
-0.18%
10
INSTRUMENT STABILITY : CENTER CAMERA
Results Moon Calibration (since October 2013) (no Ak updates considered)
MOON CENTER BLUE
MOON CENTER RED
1.10
-0.22%
-0.11%
1.00
0.95
Mulite-temporal
Multi-temporal
1.05
1.1
% decrease since Oct 13:
% decrease/year:
0.90
1.05
1
0.95
Oct-13 Nov-13 Jan-14 Mar-14 May-14 Jul-14 Sep-14 Nov-14 Jan-15 Mar-15 May-15 Jul-15 Sep-15
date
date
MOON CENTER NIR
MOON CENTER SWIR2
1.1
1.1
% decrease since Oct 13:
% decrease/year:
-0.44%
-0.23%
1
Mulit-temporal
Multi-temporal
1.02%
0.52%
0.9
Oct-13 Nov-13 Jan-14 Mar-14 May-14 Jul-14 Sep-14 Nov-14 Jan-15 Mar-15 May-15 Jul-15 Sep-15
1.05
% decrease since Oct 13:
% decrease/year:
1.05
0.95
0.9
0.9
date
11
-0.17%
-0.09%
1
0.95
Oct-13 Nov-13 Jan-14 Mar-14 May-14 Jul-14 Sep-14 Nov-14 Jan-15 Mar-15 May-15 Jul-15 Sep-15
% decrease since Oct 13:
% decrease/year:
Oct-13 Nov-13 Jan-14 Mar-14 May-14 Jul-14 Sep-14 Nov-14 Jan-15 Mar-15 May-15 Jul-15 Sep-15
date
INSTRUMENT STABILITY : SUMMARY VNIR
Libya4
LEFT
BLUE
NIR
RED
since Oct2013 per year since Oct2013 per year since Oct2013 per year
-2.73%
-1.42%
-2.64%
-1.38%
-1.43%
-0.74%
CENTER
-0.07%
-0.03%
-0.34%
-0.17%
1.14%
0.54%
RIGHT
-1.14%
-0.56%
-1.31%
-0.64%
-0.36%
-0.18%
Moon
CENTER
BLUE
NIR
RED
since Oct2013 per year since Oct2013 per year since Oct2013 per year
-0.22%
-0.11%
-0.44%
-0.23%
1.02%
0.52%
12
INSTRUMENT STABILITY : LEFT CAMERA
Results OSCAR Libya-4 (since October 2013) (Ak updates considered)
Libya4 LEFT CAMERA: BLUE
1.2
Libya4 LEFT CAMERA: RED
1.2
% decrease since Oct 13: -1.23%
% decrease/year: -0.64%
1.15
1.1
DAk
1.1
DAk
% decrease since Oct 13: -1.43%
% decrease/year: -0.74%
1.15
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
0.8
0.8
DAk
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
DATE
13
0.8
M-14
0.85
A-14
0.9
M-14
0.95
F-14
1
J-14
O-15
1.05
D-13
S-15
1.1
N-13
O-15
% decrease since Oct 13: -0.78%
% decrease/year: -0.41%
1.15
O-13
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
Libya4 LEFT CAMERA: NIR
1.2
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
INSTRUMENT STABILITY : CENTER CAMERA
Results OSCAR Libya-4 (since October 2013) (Ak updates considered)
Libya4 CENTER CAMERA: BLUE
Libya4 CENTER CAMERA: RED
1.2
1.2
% decrease since Oct 13: -2.39%
% decrease/year: -1.19%
1.15
1.1
DAk
DAk
1.1
% decrease since Oct 13: -2.06%
% decrease/year: -0.96%
1.15
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
0.8
0.8
DAk
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
DATE
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
14
J-14
0.8
M-14
0.85
A-14
0.9
M-14
0.95
F-14
1
J-14
O-15
1.05
D-13
S-15
1.1
N-13
O-15
% decrease since Oct 13: -0.34%
% decrease/year: -0.17%
1.15
O-13
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
Libya4 CENTER CAMERA: NIR
1.2
INSTRUMENT STABILITY : RIGHT CAMERA
Results OSCAR Libya-4 (since October 2013) (Ak updates considered)
Libya4 RIGHT CAMERA: BLUE
Libya4 RIGHT CAMERA:RED
1.2
1.2
% decrease since Oct 13: 0.47%
% decrease/year: 0.23%
1.15
1.1
DAk
1.1
DAk
% decrease since Oct 13: -0.36%
% decrease/year: -0.18%
1.15
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
0.8
0.8
DAk
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
15
J-14
DATE
0.8
M-14
0.85
A-14
0.9
M-14
0.95
F-14
1
J-14
1.05
D-13
1.1
N-13
% decrease since Oct 13: 0.20%
% decrease/year: 0.10%
1.15
O-13
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
Libya4 RIGHT CAMERA: NIR
1.2
VERIFICATION OF ABSOLUTE RADIOMETRIC REQ. (5 %) OVER RAYLEIGH
LEFT camera (BLUE, RED)
NIR band = ref
16
VERIFICATION OF ABSOLUTE RADIOMETRIC REQ. (5 %) OVER RAYLEIGH
CENTER camera (BLUE, RED)
Rayleigh - CENTER camera
NIR band = ref
1.2
1.15
1.1
DAk
1.05
1
0.95
0.9
A-15
M-15
J-15
J-15
A-15
S-15
A-15
M-15
J-15
J-15
A-15
S-15
O-15
M-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
0.8
J-14
0.85
Rayleigh - CENTER camera
1.2
1.15
1.1
1
0.95
0.9
O-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
0.8 17
F-14
0.85
J-14
DAk
1.05
VERIFICATION OF ABSOLUTE RADIOMETRIC REQ. (5 %) OVER RAYLEIGH
RIGHT camera (BLUE, RED)
A-15
M-15
J-15
J-15
A-15
S-15
O-15
M-15
J-15
J-15
A-15
S-15
O-15
NIR band = ref
A-15
F-15
M-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
F-14
M-14
1.2
1.15
1.1
1.05
1
0.95
0.9
0.85
0.8
J-14
DAk
Rayleigh - RIGHT camera
F-15
M-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
18
F-14
M-14
1.2
1.15
1.1
1.05
1
0.95
0.9
0.85
0.8
J-14
DAk
Rayleigh - RIGHT camera
VERIFICATION OF INTER-BAND CALIBRATION ACCURACY OVER DCC
19
PRESENTATION OUTLINE
» Introduction
» Stability of PROBA-V
» VNIR
» SWIR
» ICP updates since QWG#1
» Outlook
» Moon GSICS activities
20
INSTRUMENT STABILITY : LEFT CAMERA -SWIR
Results OSCAR Libya-4 (since October 2013) (no Ak updates considered)
Libya4 LEFT CAMERA: SWIR1
Libya4 LEFT CAMERA: SWIR2
1.2
1.2
% decrease since Oct 13: -3.41%
% decrease/year: -1.68%
1.15
1.1
DAk
1.1
DAk
% decrease since Oct 13: -4.09%
% decrease/year: -2.01%
1.15
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
0.8
0.8
DAk
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
21
J-14
DATE
0.8
M-14
0.85
A-14
0.9
M-14
0.95
F-14
1
J-14
O-15
1.05
D-13
S-15
1.1
N-13
O-15
% decrease since Oct 13: -3.42%
% decrease/year: -1.70%
1.15
O-13
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
Libya4 LEFT CAMERA: SWIR3
1.2
INSTRUMENT STABILITY : RIGHT CAMERA -SWIR
Results OSCAR Libya-4 (since October 2013) (no A updates considered)
Libya4 RIGHT CAMERA: SWIR1
Libya4 RIGHT CAMERA: SWIR2
1.2
1.2
% decrease since Oct 13: -2.72%
% decrease/year: -1.34%
1.15
1.1
DAk
1.1
DAk
% decrease since Oct 13: -4.44%
% decrease/year: -2.23%
1.15
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
0.8
0.8
DAk
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
22
J-14
DATE
0.8
M-14
0.85
A-14
0.9
M-14
0.95
F-14
1
J-14
1.05
D-13
1.1
N-13
% decrease since Oct 13: -4.75%
% decrease/year: -2.34%
1.15
O-13
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
Libya4 RIGHT CAMERA: SWIR3
1.2
INSTRUMENT STABILITY : CENTER CAMERA
Results OSCAR Libya-4 (since October 2013) (no A updates considered)
Libya4 CENTER CAMERA: SWIR1
Libya4 CENTER CAMERA: SWIR2
1.2
1.2
% decrease since Oct 13: -2.49%
% decrease/year: -1.26%
1.15
1.1
DAk
1.1
DAk
% decrease since Oct 13: -2.78%
% decrease/year: -1.44%
1.15
1.05
1.05
1
1
0.95
0.95
0.9
0.9
0.85
0.85
DATE
DATE
0.8
0.8
DAk
O-15
S-15
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
23
J-14
DATE
0.8
M-14
0.85
A-14
0.9
M-14
0.95
F-14
O-15
1
J-14
S-15
1.05
D-13
O-15
A-15
1.1
N-13
S-15
% decrease since Oct 13: -2.40%
% decrease/year: -1.39%
1.15
O-13
A-15
J-15
J-15
M-15
A-15
M-15
F-15
J-15
D-14
N-14
O-14
S-14
A-14
J-14
J-14
M-14
A-14
M-14
F-14
J-14
D-13
N-13
O-13
Libya4 CENTER CAMERA: SWIR3
1.2
INSTRUMENT STABILITY : SUMMARY SWIR
Libya4 (status 15/10/2015)
LEFT
SWIR1
SWIR2
SWIR3
since Oct2013 per year since Oct2013 per year since Oct2013 per year
-3.41%
-1.68%
-4.09%
-2.01%
-3.42%
-1.70%
CENTER
-2.49%
-1.26%
-2.78%
-1.44%
-2.80%
-1.39%
RIGHT
-4.44%
-2.23%
-2.72%
-1.34%
-4.75%
-2.34%
Moon
SWIR1
CENTER
24
SWIR2
since Oct2013 per year
-0.17%
-0.09%
SWIR3
PRESENTATION OUTLINE
» Introduction
» Stability of PROBA-V
» ICP updates since QWG#1
» Outlook
» Moon GSICS activities
25
INSTRUMENT STABILITY : SUMMARY SWIR
Libya4 (status 15/10/2015)
LEFT
SWIR1
SWIR2
SWIR3
since Oct2013 per year since Oct2013 per year since Oct2013 per year
-3.41%
-1.68%
-4.09%
-2.01%
-3.42%
-1.70%
CENTER
-2.49%
-1.26%
-2.78%
-1.44%
-2.80%
-1.39%
RIGHT
-4.44%
-2.23%
-2.72%
-1.34%
-4.75%
-2.34%
2.8 % update feb 2015
26
INSTRUMENT STABILITY : SUMMARY SWIR
Libya4 (status 15/10/2015)
LEFT
SWIR1
SWIR2
SWIR3
since Oct2013 per year since Oct2013 per year since Oct2013 per year
-3.41%
-1.68%
-4.09%
-2.01%
-3.42%
-1.70%
CENTER
-2.49%
-1.26%
-2.78%
-1.44%
-2.80%
-1.39%
RIGHT
-4.44%
-2.23%
-2.72%
-1.34%
-4.75%
-2.34%
ICP update Aug/Sept 2015
27
ICP file update of 2.8 %
in feb 2015
INSTRUMENT STABILITY : SWIR ICP FILE UPDATE
% decrease since October 2013: status August 2015
site
libya1*
libya2*
libya3*
libya4**
niger1*
niger2**
niger3*
avg
median
left
center
right
swir1 swir2 swir3 swir1 swir2 swir3 swir1 swir2
swir3
-1.7 -1.8 -1.3 -1.4 -1.5 -1.6 -0.7 -3.1
0.2
-3.1
-1.0 -2.0 -0.4 -1.1 -0.9 -0.3 -1.3 -3.3
0.0
-3.2
-1.3 -1.4
0.0
-0.7 -1.3 -1.1 -1.0 -3.2
0.8
-2.3
-2.8 -3.0 -2.7 -1.9 -2.5 -2.7 -1.9 -4.1 -0.4 -3.9
-2.2
-0.8 -2.7 -1.8 -1.6 -2.5 -3.3
1.9
-1.3
-2.2 -2.2 -1.0 -1.5 -0.9 -0.8 -1.8 -3.3 -0.3 -3.2
-0.9 -1.1 -0.9 -0.6 -1.0 -1.3 -2.6 -3.1
0.9
-2.2
-1.7
-1.7
-1.9
-1.9
-1.0
-0.9
-1.4
-1.4
-1.4
-1.3
-1.3
-1.3
-1.7
-1.8
-3.3
-3.3
0.4
0.2
-2.8
-3.1
** Desert BRF RPV parameters MISR/MODIS (Govaerts Y., Sterckx, S., Adriaensen, S, 2013)
* Desert BRF RPV parameters POLDER/ATSR2 (Govaerts and Clerici, 2004)
28
013
COMPLEXITY ICP UPDATE : AN EXAMPLE
29
COMPLEXITY ICP UPDATE : AN EXAMPLE
30
CALIBRATION: UPDATES- TRACEABILITY USER
31
RADIOMETRIC CALIBRATION:OUTLOOK
»
»
1st Reprocessing of PROBA-V archive (scheduled for first semester 2016)
»
Bias (inter-camera/inter-band) adjustments to be implemented from start of operations
»
Degradation : smoothly changing absolute calibration parameters ( now: step-wise
adjustment)
» Fitting of trending model
ICP files Real-time processing : ideally function could be used then operationally to predict the
absolute calibration parameter valid for the next month based on all previously acquired data,
without risk of unwanted fluctuations in the updates
32
LUNAR CALIBRATION : COMPARISON WITH GSICS MODEL
»
Global Space-Based Intercalibration System : initiative of the weather satellite organisations in
2005 (WMO and CGMS)
»
Try to establish means and methods to compare the performance of different operational
satellites
»
Write ATBDS and even implement prototypes to be used by members/community.
»
Lunar Calibration subgroup : founded at GSICS annual meeting March 2014
»
EUMETSAT : Collaboration with USGS –> GSICS reference implementation of USGS ROLO
» Lunar Calibration workshop in Darmstadt
33
LUNAR CALIBRATION : COMPARISON WITH GSICS MODEL
»
»
Goal of GSICS working group
»
apply to all participating sensors : stability trending
»
Adapt current ROLO model to be able to perform absolute calibration
»
Perform intercomparisons between sensors
First step : inter-compare VITO results with GSICS results
»
Provide recorded center of moon time and spacecraft position to the model
»
Compare Observed with GSICS simulated Total Irradiance
34
LUNAR CALIBRATION : COMPARISON WITH GSICS MODEL
Result : BLUE
TREND (10/2013)
year
total
35
GSICS
VITO
-0.30% -0.11%
-0.73% -0.22%
LUNAR CALIBRATION : COMPARISON WITH GSICS MODEL
Result : RED
TREND (10/2013)
year
total
36
GSICS
VITO
0.30%
0.52%
0.73%
1.02%
LUNAR CALIBRATION : COMPARISON WITH GSICS MODEL
Result : NIR
TREND (10/2013)
year
total
37
GSICS
VITO
-0.294% -0.23%
-0.725% -0.44%
LUNAR CALIBRATION : COMPARISON WITH GSICS MODEL
Result : SWIR
2%
3%
TREND (10/2013)
year
total
38
GSICS
VITO
-0.06% -0.09%
-0.16% -0.17%
LUNAR CALIBRATION : COMPARISON WITH GSICS MODEL
Result : GEOMETRY
39
LUNAR CALIBRATION : COMPARISON WITH GSICS MODEL
Result : Conclusions
»
GSICS model is applied to the PROBA-V moon data
»
PROBA-V stable trending results are confirmed by the GSICS model
»
VITO implementation has larger variation over time : to be investigated
40