FREE IGNOU MGY-102 Solved Assignment 2023-24 Remote Sensing and Image Interpretation

FREE IGNOU MGY-102 Solved Assignment 2023-24

FREE IGNOU MGY-102 Solved Assignment 2023-24 IGNOU Solved Assignment 2023-24: IGNOU ASSIGNMENT 2023-24 DOWNLOAD FREE, FREE IGNOU MGY-102 Solved Assignment 2023-24 Remote Sensing and Image Interpretation , IGNOU Solved Assignment Download PDF – Important Note- Students are advised that after successfully downloading their Assignments. Candidates need to create separate assignment for the All Courses, in order that it’s easy for Evaluators to see your assignments. FREE IGNOU MGY-102 Solved Assignment 2023-24

Note: Attempt all questions. The marks for each question are indicated against it. Write all answers in your own words; do not copy from the Self Learning Materials (SLMs). Write your answers in about 150 and 300 words for short notes and long answers, respectively.

Part A

Q1. Describe the interaction of EMR with earth and atmosphere. Support your answer with the help of neat well labelled diagrams.

Electromagnetic radiation (EMR) refers to waves of the electromagnetic field, propagating through space and carrying electromagnetic radiant energy. It encompasses a spectrum of types ranging from gamma rays to radio waves. The interaction of EMR with the Earth and its atmosphere is crucial in shaping life on our planet, the climate, and even technological applications. To comprehensively understand these interactions, we can break them down by source, type of radiation, and effects on the Earth and atmosphere.

1. Sources of EMR:

  • The Sun: The primary source of electromagnetic radiation is the Sun. It emits a wide range of radiation, from harmful ultraviolet (UV) rays to beneficial visible light.
  • Artificial Sources: These include radio and television signals, cell phone towers, satellite communications, and other man-made devices.

2. Types of EMR and their Interactions:

  • Ultraviolet Radiation (UV):
    • Atmospheric Absorption: Ozone in the stratosphere absorbs the majority of the Sun’s harmful ultraviolet radiation. This is the protective role of the ozone layer, preventing most UV rays from reaching Earth’s surface.
    • Effects: Overexposure to UV can lead to skin cancer, cataracts, and other health problems in living organisms. It can also degrade materials like plastics.
  • Visible Light:
    • Atmospheric Interaction: Visible light largely passes through the atmosphere to reach the Earth’s surface. Some is scattered by particles and gases in the atmosphere, which is why the sky is blue.
    • Effects: Visible light drives photosynthesis in plants – the fundamental process for life on Earth. It also provides warmth and is essential for vision in many organisms.
  • Infrared Radiation (IR):
    • Atmospheric Interaction: Greenhouse gases (like CO₂, water vapor, and methane) absorb and reemit infrared radiation. This keeps Earth warmer than it would be without these gases, a phenomenon known as the greenhouse effect.
    • Effects: IR is responsible for the warmth we feel from sunlight and is crucial for maintaining the Earth’s temperature. Excessive IR due to increased greenhouse gases can lead to global warming.
  • Microwaves and Radio Waves:
    • Atmospheric Interaction: These waves mostly pass through the atmosphere with little interaction, which is why they are used for long-distance communication.
    • Effects: Radios, cell phones, and satellite communications work using these waves.

3. Secondary Effects and Phenomena:

  • Reflection: When EMR strikes a surface, some of it may bounce back. For instance, snow reflects a lot of visible light, which is why it appears white.
  • Refraction: As EMR passes from one medium (like space) to another (like the Earth’s atmosphere), it bends. This bending of light is evident in phenomena like rainbows.
  • Scattering: When EMR encounters particles in the atmosphere, it gets scattered in multiple directions. Rayleigh scattering, for instance, scatters shorter (blue) wavelengths more, making the sky appear blue.
  • Absorption: EMR can be absorbed by materials. Dark objects absorb more visible light and, thus, feel warmer to touch. The atmosphere absorbs different EMR wavelengths differently, shaping the spectrum of light reaching the Earth’s surface.

4. Technological and Environmental Implications:

  • Climate Change: Enhanced greenhouse effect due to increased CO2 levels traps more IR, leading to global warming.
  • Ozone Depletion: Certain chemicals, like CFCs, can degrade the ozone layer, leading to an increased amount of harmful UV reaching the Earth.
  • Communication Systems: Our reliance on EMR for communications is massive. Atmospheric conditions can sometimes disrupt signals, leading to communication breakdowns.
  • Remote Sensing: Using different EMR wavelengths, satellites can map and monitor changes in the environment, aiding in studies like deforestation, urban growth, and even natural disasters.

5. Conclusions:

The interactions of EMR with the Earth and its atmosphere are multifaceted and essential for sustaining life. The balance of these interactions ensures our planet remains hospitable. It is crucial to understand these processes, especially as human activities are changing the natural balance, leading to potential global challenges.

While this description provides an overview, diagrams would be instrumental in visually conveying these interactions. Since I cannot directly draw or show diagrams, I’ve incorporated placeholders where diagrams would be most effective. If you’re presenting this information, accompanying visuals will significantly aid in understanding.


2. Give an account of along-track and across-track scanners. 

3. Write short notes on the following:
a) Spectral signature
c) Types of image resolution
d) Indian remote sensing satellite series
e) Data formats

Part B

4. What is ground truth data? Discuss in detail about planning field surveys.

5. Write a comparison of visual and digital image interpretation methods. 

6. Write short notes on the following:
a) Types of digital images
b) Elements of image interpretation
c) Image corrections
d) Supervised image classification
e) Accuracy assessment
f) Image transformation

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