Photogrammetry Basics
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Questions and Answers

What is the primary difference between terrestrial and aerial photography?

  • Terrestrial photography relies on natural light, whereas aerial does not.
  • Terrestrial photography captures images from the air using drones.
  • Aerial photography captures images from above, while terrestrial is from ground level. (correct)
  • Aerial photography is taken from the ground level.

    • Which factor is crucial for determining the scale of a vertical photograph?

  • The type of camera used for capturing images.
  • The time of day when the photograph is captured.
  • The angle of the photograph taken.
  • The altitude at which the photograph is taken. (correct)

    • What is the effect of relief displacements in photographic images?

  • They cause distortions in the perceived position of objects. (correct)
  • They enhance the clarity of distant objects.
  • They reduce the need for flight planning.
  • They increase the overall brightness of the photograph.

    • How can heights be determined from parallel measurements in photogrammetry?

    <p>Through triangulation methods using known reference points.</p> Signup and view all the answers

    What is an essential aspect of flight planning for aerial photography?

    <p>Selecting the appropriate altitude and path for optimal image capture.</p> Signup and view all the answers

    Study Notes

    Basic Definitions

    • Photogrammetry: The science and art of obtaining reliable measurements from photographs.

    Terrestrial Photography

    • Terrestrial photography: Taking photographs from ground-based stations
    • Used for creating maps, measuring distances, and documenting scenes

    Aerial Photography

    • Aerial photography: Taking photographs from airborne platforms like airplanes or drones
    • Used to create maps, monitor environmental changes, and assess infrastructure

    Scale of Vertical Photograph

    • Scale of vertical photograph: The ratio of the distance between two points on the photograph to the corresponding distance on the ground
    • Determined by the focal length of the camera, the altitude of the aircraft, and the distance between the two points
    • Formula: Scale = Focal length / (Altitude - Ground elevation)

    Relief and Relief Displacements

    • Relief: Variations in ground elevation
    • Relief displacement: Distortion of features due to the difference in elevation
    • Relief displacement is proportional to the height of the object and the distance from the camera.

    Heights from Parallel Measurements

    • Heights from parallel measurements: Determining heights from the difference in the distances between two points measured on two overlapping photographs
    • Requires photographs taken in stereo (overlapping)

    Flight Planning

    • Flight planning involves determining the flight path, altitude, and number of photographs needed for a specific project
    • Factors considered: Project area, desired map scale, camera specifications, and weather conditions.

    Photographs Required

    • Number of photographs required depends on: Area to be covered, overlap between photographs, and scale required.
    • Overlapping photographs are essential for stereo viewing and accurate measurements.

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    Description

    This quiz covers fundamental concepts of photogrammetry, including terrestrial and aerial photography. You'll explore the scale of vertical photographs and understand the effects of relief and relief displacement. Test your knowledge in this essential field of measurement and mapping.

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