Geoscience Reference
In-Depth Information
3.6.2
Satellite Observations
The POLDER radiometer consisted of three principal components: a CCD
matrix detector, a rotating wheel carrying the polarizers and spectral filters,
and wide field of view (FOV) telecentric optics as described in Deschamps et
al. (1994). The optics had a focal length of 3.57mm with a maximum FOV
of 114
◦
. POLDER acquired measurements in nine bands, three of which were
polarized.
All POLDER measurements were sent to Centre National des Etudes Spa-
tiales (CNES, France) where they were processed. One can find a detailed
description in Breon et al. (1998). Processed data have 3 levels of products.
Level-1 product consists of radiometric and geometric processing. It yields
top-of-the-atmosphere geocoded radiances. Level-2 processing generates geo-
physical parameters from individual Level-1 products, which cover the fraction
oftheEarthobservedduringoneADEOSorbitwithadequateilluminationcon-
ditions. POLDER Level-2 product is taken here for interpreting.
Tab l e 3 . 4 .
Details of the satellite experiments
µ
0
ϕ
τ
0
ω
0
,
◦
N ate
No. Experiment,
I age
geographic site
size
(pixels)
14
The Southwest
0.7-0.9
43.7-47.8 24 June 1997 388
15 0.996
part of Europe,
1.65
◦
E-32.04
◦
E
15
The Atlantic Ocean, and
0.7-0.9
43.7-47.8 24 June 1997 316
15 0.997
the South of France
24.80
◦
W-3.24
◦
E
16
The North Sea and the
0.6- 0.8 57.7-60.8 24 June 1997 316
20 0.995
West part of Scandinavia
−0.48
◦
E-17.22
◦
E
17
Scandinavia
0.6-0.8
57.7-60.8 24 June 1997 289
15 0.995
and the Baltic Sea
1.57
◦
-38.88
◦
E
18
Baltic Sea
0.6-0.8
57.7-60.8 24 June 1997 316
7
0.995
and the Northwest part
of Russia 27.65
◦
-66.72
◦
E
19
Southeast Asia
0.8-1.0
6.7-13.8
24 June 1997 585
40 0.995
and the Pacific Ocean
121.63
◦
-123.61
◦
W
20
The East part of Siberia,
0.7-0.9
45.7-51.3 24 June 1997 585
30 0.997
the Pacific Ocean, Sakhalin
Island 127.60
◦
-148.68
◦
W
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