GELE Photogrammetry & Cartography — Stereoscopy, DEM and OrthophotoSlides
Stereoscopy, DEM and Orthophoto slides, sized for screen and print. Flip through them for a five-minute pre-mock refresh, or print the deck for on-paper annotation. Either way, the slides cover Stereoscopy, DEM and Orthophoto at the depth Professional Regulation Commission (PRC) — Board of Geodetic Engineering tests for the GELE 2026.
Exam context
Professional Regulation Commission (PRC) — Board of Geodetic Engineering runs the Geodetic Engineer Licensure Examination on September 2026. Its Photogrammetry & Cartography section sits under a "Core" weighting, and Stereoscopy, DEM and Orthophoto is the 3rd chapter in the 6-chapter GELE Photogrammetry & Cartography rotation. The GELE passing mark is 70% weighted average, no sub-test below 50%, and the most recent 2026 paper drew about a meaningful share of questions from Photogrammetry & Cartography.
Stereoscopy, DEM and Orthophoto - Slides
Slides
Chapter Overview: Stereoscopy, DEM and Orthophoto
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S1
Stereoscopy: Creating the 3-D Model
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S2
Parallax: The Measure of Height
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S3
Base-Height Ratio (B/H): The Critical Geometric Parameter
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S4
Worked Example 1: Calculating Base-Height Ratio
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S5
Worked Example 2: Air-Base from Forward Overlap
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S6
Digital Elevation Models (DEM): Definition and Structure
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S7
DEM Production Methods: Photogrammetry, LiDAR, and InSAR
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S8
DEM Applications: Contours, Volumes, and Drainage Analysis
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S9
Relief Displacement in Raw Aerial Photographs
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S10
Orthophoto: Definition and Geometric Properties
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S11
Orthorectification Process: From Raw Photo to Orthophoto
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S12
Orthomosaics: Seamless Composite Base Maps
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S13
Worked Example 3: Why Orthophoto Over Raw Photo?
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S14
Accuracy Assessment: DEM and Orthophoto Quality Control
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S15
Common Pitfalls and Troubleshooting in Orthophoto Production
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S16
Philippine Context: Mapping Standards and Regulations
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S17
Chapter Summary: Key Concepts and Takeaways
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S18
Practice Problems: Stereoscopy and DEM
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S19
Key Formulas and Reference Summary
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S20
Stored In
chapter_slides
Slide Count
20
Summary Only
true
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