4 and S/N of VTIR hardware measured in the factory was larger in
band 3 than in band 4.
(3)Geometric distortion compensation evaluation
By using 20 GCPs in one pass scene, position error of level 2
imagery was measured to be 3.1-4.7km which is under specified
value 7 pixels (6.3 km).
(4)Spatial resolution evaluation
By using edge of coast, spatial resolution was measured as
follows:
line direction pixel direction
Band 1 1.4 pixel 3.3 pixel
Band 3 3.0 pixel 4,8 pixel
Band 4 3.3 pixel 5.4 pixel 1 pixel:900m
In case of band 2, spatial resolution can not be obtained because
earth surface can not be observed, Concerning thermal band (
Band 2,3,4),three pixel is nominal spatial resolution.
(5)Sea surface temperature extraction evaluation
LOWTRAN 6 was applied to VTIR thermal band imagery(Path
21,May 31,1987) and the following results were obtained.
level 2 Atmospheric compensated | Truth
data data data
Band 3 Band H Band 3 Band 4
17.85 16.40 19.65 18.85 19.6 (Omaezaki)
18.00 16.35 20.50 19.35 19.2 (Oshima)
Remark: Radio sonde data was used. unit: °C
3.3 MSR
The MSR is a Dicke type radiometer to measure very weak earth
radiation noise at the 23 GHz and 31 GHz. Beam width of MSR is
32 km (23 GHz) and 23 km (31 GHz). Main nission objective of the
MSR is to measure water vapor and liquid water, snow cover, sea
ice distribution.
(1)Radiometric distortion compensation evaluation
By measuring mean and standard deviation in level 2 imagery,
the following results were obtained.
23 GHz 10msec 1.14 K
23 GHz 47msec 1.43 K
31 GHz 10msec 1.33 K
31 GHz 47msec 1.30 K
In ease of evaluation of internal calibration source, the
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