| Detail | Information |
|---|---|
| Examination | Assistant Scientist (Landuse) - Question Paper |
| Year | 2023 |
| Conducting Body | Haryana Public Service Commission (HPSC) |
| Subject | Geospatial Technology / Remote Sensing / GIS |
| Duration | 3 Hours |
| Maximum Marks | 150 |
| Number of Questions | 18 |
| Question Type | Mixed (descriptive + objective) |
This SEO summary combines Page 1 exam header and instructions with Page 2 repaired OCR containing eight descriptive objective questions. Page 1 confirms the exam conducted by the Haryana Public Service Commission (HPSC) for the Assistant Scientist (Landuse) with a paper code HPSC/63B, 150 maximum marks, and a 3-hour duration. Page 2 presents corrected questions covering key geospatial topics: image processing (including segmentation, thresholding, and classification), GNSS concepts and corrections (DGPS), GIS-based spatial analysis, spectral signatures and remote sensing resolutions, GNSS constellations, geodesy concepts (map datum, MSL, geoid, WGS-84), land surveying techniques, and photogrammetry with stereoscopy. The eight questions (1–8) are descriptive with sub-parts where applicable, designed to test broad competency in geospatial science.
(a) \sim 1. Explain the concept of image segmentation in digital image processing. Elaborate the importance of thresholding and region growing, used for segmentation. (Word limit 150)
(b) Define image classification. Discuss supervised and unsupervised classification techniques, highlighting their differences. (Word \ limit \ 150)
(a) Enumerate and explain the components of a GNSS receiver. How does Differential GPS (DGPS) improve the accuracy of position determination? (Word limit 150)
(b) Define errors in GNSS observations and discuss various correction techniques used to minimize them. (Word limit 150) 3. How is GIS used as a tool for spatial analysis? Define the interpolation, buffer, overlay, terrain modelling and network analysis techniques used in GIS. (Word limit 300) 10 4. (a) Explain the concept of spectral signature. How can spectral signatures be used in the identification of different materials on the Earth's \hat\varphi surface? (Word limit 150) (b) Compare and contrast different resolutions in remote sensing. (Word limit 150) 5 5. Explain the principle used in Global Navigation Satellite Systems (GNSS) for positioning and navigation. How does GNSS work and what are the main constellations used? (Word limit 300) 10 6. Define map datum and explain the significance of MSL (Mean Sea Level), geoid and WGS-84 (World Geodetic System-1984) in geospatial data. (Word limit 300) 10 7. Illustrate various land surveying techniques in detail. (Word limit 300) 10 8. Describe stereoscopy and its applications in 3-D modelling and relief displacement analysis in photogrammetry. (Word limit 300) 10 \mathbf 2 HPSC/63B
(a) 4. Explain the concept of spectral signature. How can spectral signatures be used in the identification of different materials on the Earth's \hat\varphi surface? (Word limit 150)
(b) Compare and contrast different resolutions in remote sensing. (Word limit 150)
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Haryana Public Service Commission (HPSC).
Maximum marks are 150; duration is 3 hours.
There are 18 questions; candidates must attempt any 15.
All questions are printed in English.
HPSC/63B.
Geospatial technologies including GIS, remote sensing, GNSS, photogrammetry, map datums, land surveying, and stereoscopy.