GELE Geodesy — Figure of the Earth and the Reference EllipsoidSlides
If you commute to a GELE review centre (or watch Super Tutor on the jeepney), these Figure of the Earth and the Reference Ellipsoid slides are designed for exactly that. Each slide holds one idea, one visual cue, and one PRC-style question pattern — ready for quick bursts of review between stops.
Exam context
Professional Regulation Commission (PRC) — Board of Geodetic Engineering runs the Geodetic Engineer Licensure Examination on September 2026. Its Geodesy section sits under a "Core" weighting, and Figure of the Earth and the Reference Ellipsoid is the 1st chapter in the 6-chapter GELE Geodesy 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 Geodesy.
Figure of the Earth and the Reference Ellipsoid - Slides
Slides
Why Earth Is Not a Sphere
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S1
Definition: The Reference Ellipsoid
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S2
Ellipsoid Parameters: a, b, and f
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S3
Key Relationships: Formulas
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S4
Worked Example 1: WGS84 Parameters
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S5
Worked Example 2: Deriving Parameters from Axes
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S6
Radii of Curvature: Prime Vertical (N)
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S7
Radii of Curvature: Meridian (M)
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S8
Comparison: N vs. M with Latitude
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S9
Mean Radius of Curvature
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S10
Worked Example 3: Computing N at 45° (WGS84)
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S11
Worked Example 4: Computing M at 30° and R at 30°
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S12
Philippine Relevance: PRS92 and WGS84
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S13
Common Exam Pitfalls and Misconceptions
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S14
Summary: Key Formulas and Values
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S15
Chapter Review Questions
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S16
Chapter Conclusion and Next Steps
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S17
Stored In
chapter_slides
Slide Count
17
Summary Only
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