Relief Displacement

The camera lens operates much like the human eye, both of which produce single-point perspective views of the scene. This perspective produces increasing relief displacement of objects nearing the edge of view. This is most noticeable in vertical airphotos, because tall objects appear to lean away from the photo center. Conversely, low objects are displaced toward the center. Relief displacement is minimal near the photo center and becomes extreme at the edge. This allows for a side view of tall objects near the edge of a vertical photograph, particularly for wide-angle fields of view (Fig. 2-7). The height of a tall vertical object may be calculated from its relief displacement, and the height of tall objects also may be determined from measurements of shadows.

Relief Displacement

FIGURE 2-5 Color-visible (A) and color-infrared (B) kite aerial photographs of the campus of Emporia State University, Kansas, United States. A portion of the football field, dormitory buildings, parking lots, automobiles, grass, and deciduous trees. Photosynthetically active vegetation is depicted in red and pink colors in the infrared image. Note variations in tree appearance in the color-infrared version. Taken from Aber, Aber and Leffler (2001, fig. 3).

FIGURE 2-5 Color-visible (A) and color-infrared (B) kite aerial photographs of the campus of Emporia State University, Kansas, United States. A portion of the football field, dormitory buildings, parking lots, automobiles, grass, and deciduous trees. Photosynthetically active vegetation is depicted in red and pink colors in the infrared image. Note variations in tree appearance in the color-infrared version. Taken from Aber, Aber and Leffler (2001, fig. 3).

Kite Aerial Photo Vertical

FIGURE 2-6 Vertical kite aerial photograph in visible light showing water pools and vegetated hummocks in the central portion of Mannikjarve Bog, Estonia. Moss species display distinctive green, gold, and red autumn colors along with pale green dwarf pine trees on hummocks. These dramatic colors are not displayed at other times of the year. Field of view ~60 m across. Based on Aber et al. (2002, fig. 2).

FIGURE 2-6 Vertical kite aerial photograph in visible light showing water pools and vegetated hummocks in the central portion of Mannikjarve Bog, Estonia. Moss species display distinctive green, gold, and red autumn colors along with pale green dwarf pine trees on hummocks. These dramatic colors are not displayed at other times of the year. Field of view ~60 m across. Based on Aber et al. (2002, fig. 2).

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Responses

  • stephan
    What is relief displacement in photo?
    7 years ago
  • duane
    What is relief displacement in aerial photography?
    7 years ago
  • Oskari
    How to calculte the relief displacement on aerial photo?
    7 years ago
  • emilia
    How to eliminate relief displacement?
    1 year ago
  • birgit
    What is relif displacement?
    1 year ago
  • Smeralda Baresi
    What is relief displacement on a vertical photograph?
    6 months ago

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