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GELE Photogrammetry & CartographyScale, Relief Displacement and ParallaxSlides

Visual slide deck for Scale, Relief Displacement and Parallax. Perfect for reviewers who prefer seeing concepts laid out with diagrams and bullet points rather than long paragraphs. Built specifically for GELE Photogrammetry & Cartography aspirants preparing for the 2026 cycle.

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 Scale, Relief Displacement and Parallax is the 2nd 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.

Scale, Relief Displacement and Parallax - Slides

Slides

Chapter Overview: Scale, Relief Displacement and Parallax

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S1

Aerial Photography Basics: Vertical Photos and Principal Point

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S2

What is Relief Displacement?

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S3

Relief Displacement Formula and Components

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Worked Example 1: Calculating Relief Displacement

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Worked Example 2: Finding Object Height from Displacement

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S6

Key Characteristics of Relief Displacement

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S7

Introduction to Stereoscopic Parallax

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Parallax-Height Formula and Components

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Worked Example 3: Height from Parallax Difference

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S10

Measuring Parallax in the Stereoplotter

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Comparison: Relief Displacement vs. Parallax

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Worked Example 4: Choosing Between Methods

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S13

Applications in Philippine Mapping and PRS92/PPCS

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Common Mistakes and Pitfalls in Examinations

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Practice Problems and Solutions

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Summary and Key Takeaways

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Stored In

chapter_slides

Slide Count

17

Summary Only

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