LISS
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The document describes the specifications of several sensors used in Indian remote sensing satellites. LISS-I operated in four spectral bands with a resolution of 72m and swath width of 148km. LISS-II had higher resolution of 36.25m and smaller swath of 74km across four bands. LISS-III covered a 142km swath at 23.5m resolution in green, red, NIR and SWIR bands. LISS-IV could operate panchromatically at 5.8m or multispectrally like LISS-III with a swath of 23.9-70km for Resourcesat-1 or 70km for Resourcesat-2.
LISS
- 1. Sensors and Their Specifications Linear Imaging Self-Scanning System I (LISS-I) LISS-I (Linear Imaging self Scanner) was a payload for the IRS-1A satellite. This camera operated in four spectral bands. It operated in a push-broom scanning mode using a CCD array. Each band used 2 CCD's which were staggered in the focal plane. It was again used in IRS-1B. It used 7 bit quantization, and had a swath of 148 Kms. Images of LISS-I were extensively used in forestry, crop acreage, yeild estimation, drought monitoring, flood monitoring etc. Band Details Swath Resolution Sensor Spectral Bands Revisit Width (m) Channels (µm) Time (km) LISS-I-1 0.45-0.52 (blue) LISS-I-2 0.52-0.59 (green) 72 148 22 LISS-I-3 0.62-0.68 (red) LISS-I-4 0.77-0.86 (near IR) LISS-II was similar to LISS-I, but with higher spatial resolution and smaller swath. it was on payload in three satellites : IRS-1A, IRS-1B, IRS-P2. Band Wavelength Resolution Swath Revisit (µm) (m) Width time (km) (days) Band 1 (blue) 0.46 to 74 36.25 22 0.52 (145) Band 2 (green) 0.52 to 74 36.25 22 0.59 (145) Band 3 (red) 0.62 to 74 36.25 22 0.68 (145) Band 4 (NIR) 0.77 to 74 36.25 22 0.86 (145) S K Diwakar
- 2. Sensors and Their Specifications LISS-III 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 meters in all spectral bands. Band Wavelength Resolution Swath Revisit time (µm) (m) Width (days) (km) Band 1 0.52 to 0.59 23.5 142 5 (VIS) Band 2 0.62 to 0.68 23.5 142 5 (VIS) Band 3 0.77 to 0.86 23.5 142 5 (NIR) Band 4 1.55 to 1.7 70.5 148 5 (SWIR) 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 Number of Array Panchromatic 0.50 – 0.75 µm 58 x 5.8 m 3 Number of Mode Band Spectral band Resolution Array 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 1 4 0.77 – 0.86 µm 5.8 x 5.8 m S K Diwakar