International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
VNIR / Level 1B | TIR / Level 2B03
Air Temperature
Observation
Temperature Correction
Aerosol Observation
Aerosol Estimation /
Atmospheric Correction
| |
Surface Temperature
Image .
Aerosol Fee NDVI Image
Figure 2. Analytic flow
2.1 Temperature observation on the ground
Kenrokuen Park is located in the center of Kanazawa, Ishikawa
Prefecture, Japan. There are 30 schools in a 4-km radius from
Kenrokuen Park. Each school has an instrument screen in its
yard. Figure 3 shows a typical instrument screen in an
elementary school. We installed a thermometer-hygrometer
with a data logger in each instrument screen and measured the
temperature and humidity at 10-minute intervals. These
observation values show the air condition at a height of 1.5 m
above the ground. A thermometer-hygrometer with a data
logger was kept in the instrument screen from June 2003 until
September 2003.
Figure 3. Instrument screen at Kanazawa Nakamura-
machi Elementary School (36.56?N, 136.64^E)
Figure 4 contains the results of the observation on August 7,
2003. Even at night, the temperature at Kanazawa Nakamura-
machi Elementary School, located in the business district, did
not fall. At Kanazawa Yuhidera Elementary School, which is
located in a pastoral area, the temperature did fall at night. This
result indicates that a difference in land cover influences the air
temperature.
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Yuhidera (36.57N, 136.71E)
Figure 4. Air temperature at Kanazawa Nakamura-machi
Elementary School and Kanazawa Yuhidera Elementary
Schooll
2.0 Atmosphere observation on the ground
A sky radiometer (POM-01: PREAD) was installed on the roof
of Building No. 24 of the Kanazawa Institute of Technology
(Figure 5). Atmospheric observations were taken during the
day using 6 wavelength channels of 0.315, 0.40, 0.50, 0.87,
0.94, and 1.04 uum (Kawata et al., 2003). The value which was
received from the sky radiometer was converted into the optical
thickness of the atmospheric aerosol using the Sky Rad. Pack
code (Nakajima et al., 2001).
Figure 5. Sky Radiometer at Kanazawa Institute of
Technology (36.53°N, 136.63°E)
Figure 6 shows the change in the aerosol optical thickness at 0.5
pum from April 2003 to September 2003. The value of the
aerosol optical thickness was high, and the change in the value
from April to May was drastic. The value of the aerosol optical
thickness decreased after June, and the change in the value
decreased. When the NDVI value is calculated in the spring at
our study site, we must be careful about the change in the
aerosol optical thickness.
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