In which of the following activities are Indian Remote Sensing (IRS) satellites used? 1. Assessment of crop productivity 2. Locating groundwater resources 3. Mineral exploration 4. Telecommunications 5. Traffic studies

1, 2 and 3 only. IRS satellites are used for crop studies, groundwater studies and mineral exploration. NRSC and ISRO list these uses. Telecommunication is done by communication satellites such as INSAT. Traffic studies are not among ISRO's listed IRS uses. Read more: SciTech0165 — Indian Remote Sensing Satellites.

Which orbit do most IRS satellites use?

Polar sun-synchronous orbit. ISRO says IRS-1A went into a polar sun-synchronous orbit, and later satellites follow the same plan. Such a satellite passes over a place at the same local time each day. Geostationary orbit suits communication satellites. Read more: SciTech0165 — Indian Remote Sensing Satellites.

What was special about EOS-05, launched in September 2026?

It is India's first imaging satellite from geosynchronous orbit. ISRO calls EOS-05 India's first ever imaging satellite from geosynchronous orbit. ISRO's home page gives the launch as 4 September 2026. So IRS-type satellites are typically polar, not always polar. Read more: SciTech0165 — Indian Remote Sensing Satellites.

Which sensor on Resourcesat-1 has a resolution of 56 m and a swath of 737 km?

AWiFS. The Resourcesat-1 handbook gives AWiFS a 56 m resolution and 737 km swath. LISS-III has 23.5 m. LISS-IV has 5.8 m at nadir. A coarse sensor covers a wide strip. Read more: SciTech0165 — Indian Remote Sensing Satellites.

What panchromatic resolution does Cartosat-3 give?

0.28 m. The NRSC brochure for Cartosat-3 gives 0.28 m in the panchromatic band and 1.12 m in four multispectral bands. The swath is about 17 km. Cartosat-1 gives 2.5 m. Read more: SciTech0165 — Indian Remote Sensing Satellites.

Under the Indian Space Policy 2023, data of what resolution needs IN-SPACe authorisation for dissemination?

Ground sampling distance of 30 cm or finer. The policy says dissemination of high-resolution data, with ground sampling distance of 30 cm or finer, needs IN-SPACe authorisation for national security. Data of 5 m and coarser is to be free and open. Read more: SciTech0165 — Indian Remote Sensing Satellites.

Why is a radar (SAR) satellite useful for mapping floods in the monsoon?

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