GEOG 330 Chapter 4 - Vantage Point, Cameras, Filters, &...

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Vantage Point, Cameras, Filters, & Film GEOG330
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Today’s Topics ! Vertical versus oblique aerial photography ! Aerial camera components ! Single lens mapping (metric) cameras ! Multiple-lens (multiple-band) cameras ! Digital aerial cameras ! Color theory ! Filters & film
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Vertical aerial photography ! Obtained when the optical axis of the camera is within ± 3° of the terrain’s perpendicular " Vertical aerial photographs are analyzed using quantitative photogrammetric techniques to obtain: # (1) Accurate planimetric & topographic base maps; # (2) Digital elevation models; and, # (3) Orthophotographs
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Vertical aerial photography ! Collected for many purposes, including those related to earth resource management and urban planning How might each of these two images be helpful for managers and/or planners?
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Low-oblique aerial photography ! Obtained when the optical axis of the camera derivates more than 3° from vertical and the horizon is not visible Are people better at visually interpreting vertical or oblique aerial photographs? Low-oblique photograph of a bridge on the Congaree River near Columbia, SC Low-oblique aerial photograph over flat terrain
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High-oblique aerial photography ! Obtained when the optical axis of the camera derivates more than 3° from vertical and the horizon is visible How useful is oblique aerial photography for scientists &/or resource managers? High-oblique aerial photograph over flat terrain A 1940 high-oblique photograph of the Grand Coulee Dam in WA
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Oblique aerial photography… Oblique photograph of the Bodega Bay area in California Oblique photograph of a glacial path northwest of ! ngermanland, Sweden Which is low-oblique and which is high-oblique?
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Aerial camera components 1 1 2 2 3 3 4 4 the eyelid the focal plane shutter
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Aerial camera components ! Film plane " = the area where the film is held flat during an exposure ! Focal length " = the distance from the rear nodal point of the lens to the film plane
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Aerial camera components ! f /stop " = the ratio of the camera lens focal length ( f ) to the diameter of the lens opening or full aperture ( d ), or: f /stop = f / d " Also referred to as the aperture " Used to designate the relative aperture setting or speed of the camera lens system
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Aerial camera components !
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GEOG 330 Chapter 4 - Vantage Point, Cameras, Filters, &...

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