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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.
| Payload | Three solid state Push Broom Cameras: PAN (<6 metre solution ) LlSS-3(23.6 metre resolution) and WiFS (189 metre resolution) |
| Orbit Height | 817 km |
| Orbit Type | Sun-synchronous near-polar |
| Inclination | 98.69° |
| Repeat Cycle | 24 days |
| Mission completed on | 21 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.
| 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 | >64 |
| 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.
| 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.
| 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 | >128 |
| 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
DATA COLLECTIONS
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.