Chapter 23 of 25
Revision Notes
Remote Sensing — Revision Notes
ICSE · Class 12 · Geography
Remote Sensing revision notes for ICSE Class 12 Geography: 4 topics in quick points. Part of the ICSE Class 12 Geography syllabus.
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.
Get complete notes with diagrams and examples
Full NotesKey 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?
Key topics in Remote Sensing include Meaning and Basic Idea, Basic Classes and Types of Sensors, Electromagnetic Spectrum and Windows, Sensors and Imaging Instruments. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Remote Sensing for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 70 practice questions on Remote Sensing. Revise 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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