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Instrument: VTIR : Visible and Thermal Infrared Radiometer
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A visible and thermal infrared radiometer (VTIR) covers one visible band and
three thermal infrared bands to detect thermal radiation from the earth's
surface. This radiometer is equipped with a rotating scanning mirror which
mechanically scans the earth's surface from right to left, at right angles to
the direction of flight of the satellite. When the mirror deviates from the
direction of the earth surface, it looks at an internal black body unit and at
deep space, and thus obtains thermal infrared calibration data. The VTIR's
resolution in terms of the earth surface is some 900 m in the visible-ray band
and about 2,700 m in the thermal infrared bands. The scanning width of the
VTIR is so wide (1,500km) that a particular area on the earth surface can be
observed continuously for ten-odd days by using its side-lap.
Wavelength/ micron
Frequency 0.5-0.7 6.0-7.0
Resolution 900m 2.7km
Sensitivity/ 55dB 0.5k
Swath 1500Km
Application Fields
Band 1 Snow cover distribution
(0.5-0.7) Ice distribution
Cloud distribution
Band 2 Water vapor distribution in upper layer
(6-7) (Temperature zone)
Detection of thin cirrus cloud
Band 3 Snow cover distribution
(10.5-11.5) Ice distribution
Monitoring of sea water flow
Sea surface temperature
Band 4 Snow cover distribution
(11.5-12.5) Ice distribution
Monitoring of sea water flow
Cloud distribution
Sea surface temperature
Contributed by:
Tasuku Tanaka, Earth Observation Program Office Director, Program Planning and
Management Department, National Space Development Agency of Japan Head Office,
Hamamatsu-cho, Minato-ku, Tokyo, Japan
Takeshi Osugi, Earth Observation Center Director, National Space Development
Agency of Japan, Ohashi Hatoyama-machi, Hiki-gun, Saitama pref, Japan