CE-504-B Remote Sensing and GIS - Dec 2024 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aDiscuss Spectral Reflectance of soil, vegetation and water with proper graph.
   How to answer

   • Define spectral reflectance and reflectance vs wavelength concept
   • Describe soil curve - increasing with wavelength, moisture effect
   • Describe vegetation curve - visible absorption, NIR high reflectance, red edge
   • Describe water curve - high in visible, strong absorption in NIR/IR
   • Sketch labelled reflectance graph for all three
2. 7 Marks
   bDescribe the concept of ideal remote sensing system with neat diagram.
   How to answer

   • Define remote sensing system and ideal system concept
   • List components: energy source, atmosphere, target, sensor, transmission, analysis
   • Explain uniform energy, non-selective atmosphere, ideal sensor characteristics
   • Draw neat labelled block diagram of ideal system
3. 7 Marks
   aDifferentiate the :

   1. i)Geostationary satellite and Sun-synchronous satellite.
   2. ii)Supervised classification and Unsupervised classification.
   How to answer

   • Define orbit basis for differentiation: altitude, inclination, period
   • Compare geostationary vs sun-synchronous on orbit, coverage, resolution, use
   • Define supervised classification: training samples, analyst guided
   • Compare supervised vs unsupervised on process, accuracy, prior knowledge
4. 7 Marks
   bWhat are the systematic and non systematic errors?
   How to answer

   • Define errors in remote sensing/GIS data
   • Explain systematic errors: causes, predictable, correctable examples
   • Explain non-systematic/random errors: causes, unpredictable examples
   • Mention correction/mitigation approaches
5. 7 Marks
   aWhat is the objectives and salient features of Chandrayan - 3?
   How to answer

   • State Chandrayaan-3 mission background and agencies
   • List objectives: safe soft landing, rover demonstration, in-situ science
   • Describe salient features: lander, rover, propulsion module, payloads
   • Mention landing site and achievements
6. 7 Marks
   bWhat is resolution for sensor in image? What are the different types of sensor resolutions?
   How to answer

   • Define resolution for sensor/image
   • Explain spatial, spectral, radiometric, temporal resolution
   • Give examples of values and trade-offs
   • State importance in image interpretation
7. 7 Marks
   aWhat are the sources of data for the GIS? And what is the objective of data collection?
   How to answer

   • List GIS data sources: maps, remote sensing, GPS, surveys, census
   • Classify primary vs secondary sources
   • Explain objective of data collection: accuracy, completeness for analysis
   • Mention data quality and updating need
8. 7 Marks
   bDefine GIS. Describe the key components of GIS.
   How to answer

   • Define GIS definition
   • List key components: hardware, software, data, people, methods
   • Brief function of each component
   • Show interrelationship with diagram if needed
9. 7 Marks
   aWhat are map projections and why are they important?
   How to answer

   • Define map projection: 3D to 2D transformation
   • Explain need: distortion control, measurement, analysis
   • Give examples of properties preserved
   • State importance in GIS/remote sensing
10. 7 Marks
    bWhat are the different types of data model used in GIS? How data conversion can be done in GIS?
    How to answer

    • Define raster and vector data models
    • Explain TIN and other models
    • Compare models and uses
    • Explain data conversion: raster-vector, format, digitizing steps
11. 7 Marks
    aDescribe the procedure adopted to input a map and creating shape files.
    How to answer

    • List input methods: scanning, digitizing, GPS, import
    • Describe georeferencing and projection setting steps
    • Explain shapefile components: .shp, .shx, .dbf
    • Outline creation procedure in GIS software
12. 7 Marks
    bWhat are the different problems of using remote sensing data in GIS?
    How to answer

    • List issues: resolution, format, projection mismatch
    • Explain geometric, radiometric, scale problems
    • Explain cost, volume, cloud cover issues
    • Suggest integration and preprocessing needs
13. 7 Marks
    aExplain how remote sensing data and GIS can be used to assess the change in land use or land cover of an area?
    How to answer

    • Outline change detection workflow: multi-date images
    • Explain classification and post-classification comparison
    • Mention NDVI, overlay and accuracy assessment
    • Give land use/land cover example
14. 7 Marks
    bWhat are the different applications of remote sensing and GIS in water resources?
    How to answer

    • List water resource applications: mapping, groundwater, flood
    • Explain watershed, water quality, irrigation monitoring
    • Mention DEM, hydrologic modelling role
    • Give examples with sensors
15. 14 Marks
    Write short notes on the following:

    1. i)Image filtering
    2. ii)UTM Projection
    3. iii)Buffer analysis
    4. iv)Overlay analysis
    How to answer

    • Define image filtering and types
    • Explain UTM projection zones and use
    • Define buffer analysis with example
    • Define overlay analysis and types