Examples

This section explores practical applications and calculations related to photogrammetry and aerial photography.

Example 4.11: Relief Displacement Of A Tower

Example 4.12: Height Of Tower Tq Above Datum

Example 4.13: Displacement Of Image Of A Tower

Example 4.14: Elevation Calculation Using Parallax Differences

Example 4.15: Height Of A Tree Using Parallax Difference

Example 4.16: Finding Height Above Datum And Differences In Heights

Example 4.17: Height Of Point B Above Point A

Exercises For Practices

This section details various exercises aimed at reinforcing concepts in aerial photogrammetry.

Short Questions

This section focuses on various topics in aerial photography, including the types of aerial photographs, the relevance of base-height ratios, relief displacement, and methods of scale determination.

Long Questions

This section discusses the determination of aerial photograph scales in undulating terrains and the reasons for scale variability.

4.18 Explain In Types Of Aerial Photo Based On The Alignment Of Optical Axis.

4.19 Discuss Some Of The Principal Uses Of Terrestrial Photogrammetry.

4.20 Draw The Diagram To Explain The Fiducial Marks.

4.21 What Are The Different Methods Of Scale Determination?

4.22 State Any Four Advantages That An Aerial Photograph Offers Over Ground Based Mapping.

4.23 What Is The Relevance Of Base-Height Ratio In Aerial Photogrammetry?

4.24 What Is A Relief Displacement?

4.25 Define Stereovision.

4.26 Draw Line Diagrams To See The Stereo-Vision From A Stereo-Pair.

4.27 Draw A Line Diagram Of Parallax Bar.

4.28 What Do You Understand By Digital Photogrammetry?

4.29 Define Interior Orientation In Aerial Photogrammetry.

4.30 What Is Isocentre In A Tilted Photograph?

4.31 Establish A Relationship To Determine The Scale Of Aerial Photograph In An Undulating Terrain.

4.32 What Do You Understand By Relief Displacement?

4.33 Briefly Explain About Image Parallax.

4.34 Discuss The Salient Features Of (I) Lens Stereoscope, And (Ii) Mirror And Lens Stereoscope.

4.35 Describe The Base Lining Procedure From A Stereo-Pair.

4.36 Discuss The Use Of A Parallax Bar.

4.37 Explain In Brief The Concept Of Digital Ortho-Photo.

4.38 Establish A Relationship To Derive The Scale Of A Tilted Photograph.

Unsolved Numerical Questions

This section presents a series of unsolved numerical problems related to aerial photogrammetry and calculations for determining various scales and displacements.

4.39 A Vertical Photograph Is Taken At An Altitude Of 1200 M Above Mean Sea Level.

4.40 Compute The Scales Of A Photograph.

4.41 The Length Of An Airport Runway Is 160 Mm On A Vertical Photograph.

4.42 A Camera With A Focal Length Of 152.35 Mm.

4.43 A Vertical Aerial Photograph Was Taken From A Flying Height Of 1385 M Above Datum.

4.44 The Distance Measured Between Two Points On A Map Is 2 Cm.

4.45 A Road Segment Of Length 1 Km Measures 6 Cm On A Vertical Photograph.

4.46 If The Length Covered By Each Photograph Is 1.5 Km.

4.47 A Rectangular Area 130 Km X 120 Km.

4.48 If The Height Of A Tower Is 50 M.

4.49 On An Aerial Photograph Taken At An Altitude Of 1500 M.

4.50 An Overlapping Pair Of Vertical Photographs Taken With A 152.4 Mm Focal Length Camera.

4.51 A Vertical Photograph Taken From 535 M Above Msl.

References And Suggested Readings

This section lists crucial references and resources that support the study material on aerial photography and photogrammetry.