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FIRST IMAGE TAKEN BY A SENSOR CALLED
Advanced Visible and Near-infrared Radiometer(AVNIR) ABOARD
Advanced Earth Observing Satellite(ADEOS)


1. Advanced Visible and Near Infrared Radiometer (AVNIR) Instrument Characteristics
AVNIR is an optical sensor with 4 spectral bands used to observe land and coastal zones in the visible and near-infrared regions. The 3 bands in the visible region correspond approximately to blue, green and red while the near-infrared band is suited to observing plant growth. In addition to these 4 bands, called the Multispectral Band, AVNIR has a Panchromatic band whose spatial resolution is twice as high.

AVNIR utilizes large linear-array CCDs with 5,000 pixels for the Multispectral band and 10,000 pixels for the Panchromatic band. AVNIR scans the earth's surface in an 80 Km (ground distance) swath perpendicular to the satellite track. Due to the narrow swath width of 80 Km AVNIR has a pointing function which can change the location of the observation field by +/- 40 degrees from the satellite track.

Main Characteristics of AVNIR:
Multispectral Bands (Mu)
(micro meter)
0.42 0.50
0.52 0.60
0.61 0.69
0.76 0.89
Panchromatic Band (Pa)
(micro meter)
0.52 0.69
Data Rate 60Mbps
Spatial resolution 16mMu
8mPa
Swath Width 80km
Pointing Range +/-40 degrees
Pointing Step 1degree

2. Expected Result
AVNIR is a high resolution sensor designed to observe land and coastal zones which have a changeable topography. AVNIR data can be used to determine soil and plant conditions which will aid in understanding global environmental problems such as desertification and decreasing tropical rain forests. Observation and study of green plant and building distribution within cities may be helpful in improving urban living environments. AVNIR can also observe the reflective characteristics of the ground surface and the atmosphere and these data may play a significant role in evaluating energy influx and expenditure on the ground surface.

The earth environmental problems derive from regional/local environmental problems. Thus, it is important to have a high resolution means of understanding localized phenomena.


3.Comparison of Optical Sensors(OPS)
ADEOS
AVNIR
JERS-1
OPS
MOS-1
MESSR
LANDSAT
TM
SPOT
HRV
Observation
Wavelength
Bands
(micro meter)
Mu
0.420.50
0.520.60
0.610.69
0.760.89

Pa
0.520.69
0.520.60
0.630.69
0.760.86
1.601.71
2.012.12
2.132.25
2.272.40

0.510.59
0.610.69
0.720.80
0.801.10




0.450.52
0.520.60
0.630.69
0.760.90
1.551.75
10.4012.50
2.082.35

Mu
0.500.59
0.610.68
0.790.89

Pa
0.510.73

Visible
Near Infrared


Visible
Near Infrared
Shortwave Infrared

Visible
Near infrared


Visible
Near Infrared
Shortwave Infrared
Thermal Infrared
Visible
Near infrared


Panchromatic
band
O X X X O
Resolution Mu 16m
Pa 8m
18.3mX24.2m

50m

30m
120mThermal
Infrared
Mu 20m
Pa 10m
Pointing O X X X O
Stereo O O X X O
Mu:Multi Spectrum Band
Pa:Panchromatic Band


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