IRS-1D INSTRUMENTS

Explore instruments used in IRS-1D mission.

EXPLORE INSTRUMENTS

IRS-1D DATA

Discover how to access IRS-1D data

ACCESS MISSION DATA

IRS-1D is part of the IRS (Indian Remote Sensing) satellites, a large family of Earth observation satellites operated by ISRO.

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.

IRS-1D Mission Specifications
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.

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

>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).

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 similar to LISS-1. Application: Vegetation index mapping. The camera provides two spectral bands in the VNIR range.

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

>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 DESCRIPTION

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.