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About IRS-1C

IRS-1C was an Earth-imaging satellite from the Indian Space Research Organisation (ISRO) which launched on 28 December 1995 and ceased operations in 2007.

The IRS (Indian Remote Sensing) satellites form a large family of Earth observation satellites operated by ISRO.

IRS-1C and IRS-1D were identical satellites launched two years apart.

IRS-1C Mission Specifications
PayloadThree solid state Push Broom Cameras:
PAN (<6 metre solution )
LlSS-3(23.6 metre resolution)
and WiFS (189 metre resolution)
Orbit Height817 km
Orbit TypeSun-synchronous near-polar
Repeat Cycle24 days
Mission completed on21 September 2007

IRS-1C Objectives

The primary objective of IRS-1C was to provide systematic and repetitive acquisition of data of Earth’s surface under nearly constant illumination conditions.

IRS-1C Instruments

Panchromatic Camera (PAN)

Data in the panchromatic region is useful in geological studies for mapping geological and geomorphological features. Higher spatial resolution is useful for urban planning studies and detecting urban fringe growth.

PAN Instrument Specifications

Spectral range

0.5 - 0.75 µm

Spatial resolution

≤ 10 m (5.6 m at nadir)

Swath width

70 km nadir view
(91 km swath for the most inclined cross-track view)

Off-nadir viewing capability

± 26º swath steering range
(with this a revisit cycle of 5 days is achieved)

Repetition cycle

24 days

SNR at saturation radiance


Data quantization

6 bit

Integration time

0.8836 ms

Image data rate

84.9 Mbit/s

Instrument mass, power

230 kg, 55-65 W


Linear Imaging Self-Scanning Sensor-III (LISS-III)

LISS is used for monitoring vegetation.

LISS-III Instrument Specifications

Spectral bands (4)

B2 : 0.52 - 0.59 µm (Green)
B3 : 0.62 - 0.68 µm (Red)
B4 : 0.77 - 0.86 µm (NIR)
B5: 1.55 - 1.75 µm (SWIR)

Spatial resolution

23.5 m (VNIR) and 70.5 m (SWIR)

Swath width

142 km (VNIR) and 148 km (SWIR), FOV=±5º

Repetition cycle

24 days

SNR at saturation radiance

> 128

Focal length of optics system

346 mm for each VNIR band, 300 mm for SWIR band

Data quantization

7 bit (resolution of 128 grey levels)

Integration time

3.55 ms for VNIR, 10.65 ms for SWIR

Data rate

35.79 Mbit/s for VNIR, 1.39 Mbit/s for SWIR data

Instrument mass, power

171 kg, 74-78 W


Wide Field Sensor (WiFS)

The WiFS camera is used for vegetation index mapping.

WiFS Instrument Specifications

Spectral bands

0.62 - 0.68 µm (Red),
0.77 - 0.86 µm (NIR)

Spatial resolution

188 m

Swath width

810 km

Repetition cycle

5 days

SNR at saturation radiance


Detector array

2 x 2048 pixels

Data quantization

7 bit (radiometric resolution of 128 grey levels)

Integration time

28.42 ms

Data rate

2.06 Mbit/s

IRS-1C Data


ESA is offering, for scientific research and application development, access to the full archive of IRS-1C upon submission and acceptance of project proposals. These products are available as part of the GAF Indian Satellite Imagery products.

ESA will support as many high-quality and innovative projects as possible within the quota limit available, therefore only a limited amount of products can be made available to each project.



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