4. Examples
The chapter focuses on the principles and techniques of photogrammetry, specifically discussing aerial photography and its applications. It includes methodologies to calculate scales, relief displacement, and the use of stereo pairs for 3D elevation determination. The content is enriched with numerical examples and exercises to reinforce the theoretical concepts presented.
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Sections
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4.11Example 4.11: Relief Displacement Of A Tower
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4.12Example 4.12: Height Of Tower Tq Above Datum
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4.13Example 4.13: Displacement Of Image Of A Tower
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4.14Example 4.14: Elevation Calculation Using Parallax Differences
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4.15Example 4.15: Height Of A Tree Using Parallax Difference
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4.16Example 4.16: Finding Height Above Datum And Differences In Heights
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4.17Example 4.17: Height Of Point B Above Point A
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4.18.14.18 Explain In Types Of Aerial Photo Based On The Alignment Of Optical Axis.
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4.194.19 Discuss Some Of The Principal Uses Of Terrestrial Photogrammetry.
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4.204.20 Draw The Diagram To Explain The Fiducial Marks.
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4.214.21 What Are The Different Methods Of Scale Determination?
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4.224.22 State Any Four Advantages That An Aerial Photograph Offers Over Ground Based Mapping.
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4.234.23 What Is The Relevance Of Base-Height Ratio In Aerial Photogrammetry?
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4.244.24 What Is A Relief Displacement?
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4.254.25 Define Stereovision.
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4.264.26 Draw Line Diagrams To See The Stereo-Vision From A Stereo-Pair.
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4.274.27 Draw A Line Diagram Of Parallax Bar.
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4.284.28 What Do You Understand By Digital Photogrammetry?
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4.294.29 Define Interior Orientation In Aerial Photogrammetry.
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4.304.30 What Is Isocentre In A Tilted Photograph?
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4.314.31 Establish A Relationship To Determine The Scale Of Aerial Photograph In An Undulating Terrain.
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4.324.32 What Do You Understand By Relief Displacement?
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4.334.33 Briefly Explain About Image Parallax.
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4.344.34 Discuss The Salient Features Of (I) Lens Stereoscope, And (Ii) Mirror And Lens Stereoscope.
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4.354.35 Describe The Base Lining Procedure From A Stereo-Pair.
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4.364.36 Discuss The Use Of A Parallax Bar.
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4.374.37 Explain In Brief The Concept Of Digital Ortho-Photo.
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4.384.38 Establish A Relationship To Derive The Scale Of A Tilted Photograph.
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4.394.39 A Vertical Photograph Is Taken At An Altitude Of 1200 M Above Mean Sea Level.
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4.404.40 Compute The Scales Of A Photograph.
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4.414.41 The Length Of An Airport Runway Is 160 Mm On A Vertical Photograph.
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4.424.42 A Camera With A Focal Length Of 152.35 Mm.
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4.434.43 A Vertical Aerial Photograph Was Taken From A Flying Height Of 1385 M Above Datum.
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4.444.44 The Distance Measured Between Two Points On A Map Is 2 Cm.
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4.454.45 A Road Segment Of Length 1 Km Measures 6 Cm On A Vertical Photograph.
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4.464.46 If The Length Covered By Each Photograph Is 1.5 Km.
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4.474.47 A Rectangular Area 130 Km X 120 Km.
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4.484.48 If The Height Of A Tower Is 50 M.
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4.494.49 On An Aerial Photograph Taken At An Altitude Of 1500 M.
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4.504.50 An Overlapping Pair Of Vertical Photographs Taken With A 152.4 Mm Focal Length Camera.
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4.514.51 A Vertical Photograph Taken From 535 M Above Msl.
What we have learnt
- Aerial photography involves different types and uses in photogrammetry.
- Relief displacement is a critical concept that depends on various factors, including the elevation of photography.
- The scale of an aerial photograph can change based on terrain variability, requiring precise calculations.
Key Concepts
- -- Aerial Photography
- The practice of taking photographs from an aircraft or other flying object, used in mapping and spatial analysis.
- -- Relief Displacement
- The apparent displacement of an object on a photograph in relation to its true position, influenced by the object's height above the datum.
- -- Scale
- The ratio of a distance on a map or photograph to the corresponding distance on the ground, which can vary based on terrain.
- -- Stereovision
- The perception of depth produced by the brain when viewing two slightly different images from different angles, as seen in stereo pairs.
Additional Learning Materials
Supplementary resources to enhance your learning experience.