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Revision Notes

Remote Sensing

ICSE · Class 12 · Geography

Quick revision notes for Remote Sensing — ICSE Class 12 Geography. Key concepts, formulas, and definitions for last-minute revision.

70 questions32 flashcards5 concepts

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Key Topics to Revise

1

Meaning and Basic Idea

  • Remote sensing means collecting information from a distance without direct contact.
  • Human senses also work as simple remote sensors: eyes, ears, and skin.
  • Eyes respond to light between 4,000 and 7,000 angstroms.
2

Basic Classes and Types of Sensors

  • Four basic classes of remote sensors are radiometer, audiometer, magnetometer, and gravimeter.
  • Radiometer measures energy level of portions of the electromagnetic spectrum and is the most important tool of remote sensing for geographical purposes.
  • Audiometer measures intensities of sound waves; it can help map ocean floor configuration through microphone-based sensing.
3

Electromagnetic Spectrum and Windows

  • Gamma rays lie at the extreme left of the electromagnetic spectrum and have the highest frequency and shortest wavelength.
  • Hard X-rays range from 0.03 to about 0.6 angstroms.
  • Soft X-rays range from 0.6 to nearly 100 angstroms.
4

Sensors and Imaging Instruments

  • Multispectral or multiband camera takes photographs in several spectral bands at the same time.
  • A typical multiband camera may use 4 to 9 lens, filter, and film combinations.
  • Multiband camera senses in the range 0.4 to 0.9 microns, covering visible light and near infrared.

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Full Notes

Key Concepts

Remote sensing means acquiring information aboutFour basic classes are radiometerElectromagnetic waves travel at about 3Human eyes respond to wavelengths betweenPassive systems use natural energy reflected

Frequently Asked Questions

What are the important topics in Remote Sensing for ICSE Class 12 Geography?
Remote Sensing covers several key topics that are frequently asked in ICSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Remote Sensing — ICSE Class 12 Geography?
Understand the core concepts first, then work through the 70 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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