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About IRS-1D
IRS-1D was an Earth-imaging satellite from the Indian Space Research Organisation (ISRO) which launched on 29 September 1997 and ceased operations in 2010.
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.
| Orbit Height | 817 km |
| Orbit Type | Sun-synchronous near-polar |
| Inclination | 98.6° |
| Repeat Cycle | 24 days |
IRS-1D Objectives
The primary objective of IRS-1D was to provide systematic and repetitive acquisition of data of the Earth’s surface under nearly constant illumination conditions.
IRS-1D 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 | 5.8 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)
Continuous service of multispectral imagery. Application: Land and water resources management.
The pushbroom camera uses refractive optics in four spectral bands (separate optics and detector array for each band).
| 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 similar to LISS-1. Application: Vegetation index mapping. The camera provides two spectral bands in the VNIR range.
| 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-1D 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.