Environmental Engineering Reference
In-Depth Information
Table 3.1
Overall characteristics of the MODIS instrument on the NASA Earth Observing
System (EOS) Aqua and Terra spacecrafts
Orbit:
705 km, 10:30 a.m. descending node or 1:30 p.m. ascending node, sun-
synchronous, near-polar, circular
Scan rate:
20.3 rpm, cross track
Swath dimensions:
2,330 km (across track) by 10 km (along track at nadir)
Telescope:
17.78 cm diam. off-axis, afocal (collimated), with intermediate field stop
Size:
1.0
1.6
1.0 m
Weight:
250 kg
Power:
225 W (orbital average)
Data rate:
11 Mbps (peak daytime)
Quantization:
12 bits
Spatial resolution:
250 m (bands 1-2)
(at nadir):
500 m (bands 3-7), 1,000 m (bands 8-36)
Design life:
5 years
Bandwidth
a
Spectral radiance
b
Required SNR
c
Primary use
Band
Land/cloud boundaries
1
620-670
21.8
128
2
841-876
24.7
201
Land/cloud properties
3
459-479
35.3
243
4
545-565
29.0
228
5
1,230-1,250
5.4
74
6
1,628-1,652
7.3
275
7
2,105-2,155
1.0
110
Ocean color phytoplankton
biogeochemistry
8
405-420
44.9
880
9
438-448
41.9
838
10
483-493
32.1
802
11
526-536
27.9
754
12
546-556
21.0
750
13
662-672
9.5
910
14
673-683
8.7
1,087
15
743-753
10.2
586
16
862-877
6.2
516
Atmospheric water vapor
17
890-920
10.0
167
18
931-941
3.6
57
19
915-965
15.0
250
Band Bandwidth
a
Spectral radiance
b
Required NEAT (K)
d
Primary use
Surface/cloud temperature
20
3.660-3.840
0.45
0.05
21
3.929-3.989
2.38
2.00
22
3.929-3.989
0.67
0.07
23
4.020-4.080
0.79
0.07
Atmospheric temperature
24
4.433-4.498
0.17
0.25
25
4.482-4.549
0.59
0.25
150
e
Cirrus clouds
26
1.360-1.390
6.00
Water vapor
27
6.535-6.895
1.16
0.25
28
7.175-7.475
2.18
0.25
29
8.400-8.700
9.58
0.05
(continued)
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