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Photogrammetry. Quantitative Measurements from Aerial Photography Flightlines of Vertical Aerial Photography Stereoscopic Vision and Stereoscopes Photo Alignment for 3D Visualization Orthophotographs and DEMs Reminder: Read Chapter 7 (pp. 193-218) for next class.

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photogrammetry
Photogrammetry
  • Quantitative Measurements from Aerial Photography
  • Flightlines of Vertical Aerial Photography
  • Stereoscopic Vision and Stereoscopes
  • Photo Alignment for 3D Visualization
  • Orthophotographs and DEMs
  • Reminder: Read Chapter 7 (pp. 193-218) for next class
slide5

http://www.dailymotion.com/video/xc4ixx_weatherman-freaking-out-over-dc-sno_shortfilmshttp://www.dailymotion.com/video/xc4ixx_weatherman-freaking-out-over-dc-sno_shortfilms

what quantitative measurements can be obtained from a single vertical aerial photograph
What Quantitative Measurements can be obtained from a Single Vertical Aerial Photograph?
  • Scale
  • Object length
  • Area of photography or feature
  • Perimeter of feature
what quantitative measurements can be obtained using overlapping stereoscopic aerial photographs
What Quantitative Measurements can be obtained using Overlapping Stereoscopic Aerial Photographs
  • Precise planimetric locations
  • Precise object height
  • Planimetrically accurate orthophotographs
  • Digital Elevation Models (DEMs)
  • Slope and aspect derived from DEMs
slide10

Block of Vertical Aerial Photography Compiled into an Uncontrolled Photomosaic

Columbia, SC

Original scale = 1:6,000

Focal length = 6” (152.82 mm)

March 30, 1993

Jensen, 2000

slide11

Flightline #4

Photo #5

Columbia, SC

Original scale = 1:6,000

Focal length = 6” (152.82 mm)

March 30, 1993

Jensen, 2000

slide12

Geometry of Overlapping Vertical Aerial Photographs

• Principal Points

• Conjugate PrinciplePoints

Jensen, 2000

slide15

Enlargement of A Portion of

Flightline #4, Photo #5

Jensen, 2000

slide18

Measurement of Object Height From A Single Aerial Photograph Based on Relief Displacement

Line of flight

Jensen, 2000

slide19

Measurement of Object Height From A Single Aerial Photograph Based on Shadow Length on Level Terrain

Sun’s rays

Jensen, 2000

stereoscopic vision
Stereoscopic Vision

What is stereoscopic vision and what is its significance for remote sensing?

stereoscopic vision1
Stereoscopic Vision
  • 3-D effect occurs when an object is viewed from two different, but overlapping, viewpoints
  • Human eyes – up to ~1,000 m
  • Aerial photography – two successive aerial photos with at least 60% forward overlap will provide stereoscopic aerial photography
  • Basis for 3-D effect
stereoscopes
Stereoscopes
  • Deflect our normally converging lines of sight so each eye views a different image
  • Lens (pocket) stereoscope
  • Reflecting stereoscope
  • Zoom stereoscope
  • Stereoplotters
photo alignment
Photo Alignment
  • Identify principal point of each photograph
  • Locate conjugate principal point (or point(s) that corresponds to principal point on adjacent photos)
  • Align points with flight line (straight line)
slide26

Geometry of Overlapping Vertical Aerial Photographs

• Principal Points

• Conjugate PrinciplePoints

Jensen, 2000

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