Photogrammetry
This presentation is the property of its rightful owner.
Sponsored Links
1 / 28

Photogrammetry PowerPoint PPT Presentation


  • 93 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

Photogrammetry

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


Photogrammetry

http://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


Photogrammetry

Flightline of Vertical Aerial Photography

Jensen, 2000


Photogrammetry

Block of Vertical Aerial Photography

Jensen, 2000


Photogrammetry

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


Photogrammetry

Flightline #4

Photo #5

Columbia, SC

Original scale = 1:6,000

Focal length = 6” (152.82 mm)

March 30, 1993

Jensen, 2000


Photogrammetry

Geometry of Overlapping Vertical Aerial Photographs

• Principal Points

• Conjugate PrinciplePoints

Jensen, 2000


Photogrammetry

Geometry of A Vertical Aerial Photograph Obtained Over

Flat Terrain


Photogrammetry

Geometry of A Vertical Aerial Photograph Collected Over Flat Terrain

Jensen, 2000


Photogrammetry

Enlargement of A Portion of

Flightline #4, Photo #5

Jensen, 2000


Photogrammetry

Geometry of A Vertical Aerial Photograph Collected Over Variable Relief Terrain

Jensen, 2000


Photogrammetry

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

Line of flight

Jensen, 2000


Photogrammetry

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


Photogrammetry

Parallactic Angles Used During Depth Perception

0.119”

59.1’

Jensen, 2000


Photogrammetry

Stereoscopic Viewing Methods

Jensen, 2000


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)


Photogrammetry

Geometry of Overlapping Vertical Aerial Photographs

• Principal Points

• Conjugate PrinciplePoints

Jensen, 2000


Photogrammetry

Lens Stereoscope with Parallax Bar

Jensen, 2000


Photogrammetry

Stereoscopic Parallax Principles

Jensen, 2000


  • Login