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IRS
P6/Resourcesat-1 and Resourcesat-2
The IRS (Indian Remote Sensing) satellites form
a large family of Earth observation satellites operated by the Indian
space agency.
IRS P6/Resourcesat-1 and Resourcesat-2 ensure continuity of medium
and high resolution data supply provided by the twin satellites
IRS-1C and IRS-1D. These two, launched in 1995 and 1997 respectively,
have completed their missions after more than 10 years of service.
Like their predecessors, Resourcesat satellites carry a LISS-III
sensor as well as a wide field AWiFS sensor, but the high resolution
(5.8 m) LISS-4 sensor replaces the panchromatic sensor. The high-resolution
data are useful for applications such as urban planning and mapping,
while the average resolution is used for vegetation discrimination,
land mapping, and natural resources management.
altitude: 816-818 km
inclination: 98.6 degrees
orbit: sun-synchronous polar
orbit period: 101 minutes
revisit time (LISS-4 et AWIFS): 5 days
swath width : 23,9 km – 70,3 km (LISS-IV) ;
140 km (LISS-III); 740 km (AWIFS)
| satellites |
IRS-P6/Resourcesat-1 (17/10/2003 –
operational) |
| |
Resourcesat-2 (20/04/2011– operational)
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LISS-III sensor
The LISS-III (Linear Imaging Self Scanning Sensor) sensor
is an optical sensor working in four spectral bands (green, red,
near infrared and short wave infrared). It covers a 141km-wide swath
with a resolution of 23 metres in all spectral bands.
|
Band
|
Spectral band |
Resolution
|
| 2 |
0,52 - 0,59 µm |
23 x 23 m |
| 3 |
0,62 - 0,68 µm |
23 x 23 m |
| 4 |
0,77 - 0,86 µm |
23 x 23 m |
| 5 |
1,55 - 1,70 µm |
23 x 23 m |
LISS-IV sensor
LISS-IV can work either in panchromatic
or in multispectral mode with the same bands as LISS-III (except
SWIR). However, the resolution is much better (5.8 m). For Resourcesat-1,
the swath width varies from 23.9 km in multispectral mode to 70.3
km in panchromatic mode. For Resourcesat-2, the multispectral swath
is enhanced to 70 km. The linear array sensor can be steered up
to 26 degrees across-track, enabling stereoscopic imaging.
| Mode |
Spectral band |
Resolution |
| Panchromatic |
0,50 - 0,75 µm |
5,8 x 5,8 m |
| Mode |
Band |
Spectral band |
Resolution |
| Multispectral |
2 |
0,52 - 0,59 µm |
5,8 x 5,8 m |
| |
3 |
0,62 - 0,68 µm |
5,8 x 5,8 m |
| |
4 |
0,77 - 0,86 µm |
5,8 x 5,8 m |
AWiFS sensor
AWIFS (Advanced Wide Field Sensor)
is an optical sensor with intermediate spatial resolution.
| Band |
Spectral band |
Resolution |
| 1 |
0,52 - 0,59 µm |
56 x 56 m |
| 2 |
0,62 - 0,68 µm |
56 x 56 m |
| 3 |
0,77 - 0,86 µm |
56 x 56 m |
| 4 |
1,55 - 1,70 µm |
56 x 56 m |
Mission
website
Data distributor: Euromap
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