Quantcast High-Oblique   Photography

 
  
 
Here  again,  as  with  vertical  photographs,  oblique photographs  can  be  made  with  photo-configured aircraft or with a hand-held camera. High-Oblique   Photography High-oblique  photography  is  accomplished  at  a camera  angle  that  shows  the  horizon  at  about  a 30-degree  camera  depression  angle  (fig.  4-4).  It resembles the view a pilot sees when approaching the target. High-oblique photographs are useful in guiding pilots toward a photographic target, a bombing target, or a helicopter landing site. High-oblique photographs are also used for orientation purposes because large areas  are  covered.  A  high-oblique  photograph  is particularly  suitable  for  pictorial  and  illustrative purposes because it provides a true perspective view of land surfaces. It is easier for a person on the ground to locate and identify objects in a high-oblique photograph than in a low oblique or vertical photograph. Low-Oblique  Photography Low-oblique  photography  does  not  show  the horizon (fig. 4-5). It is made with a camera depression angle of about 60 degrees. A low-oblique photograph covers  a  relatively  small  area.  The  subjects  in  a low-oblique photograph look more familiar than in a vertical  photograph—as  if  you  were  viewing  them  from the top of a tall building. A low-oblique photograph is normally used for identification purposes, and for that reason, a large image of the target is necessary. You may at first come to the wrong conclusion, because  of  their  names,  that  high-  and  low-oblique photographs  are  made  from  high  and  low  altitudes, respectively. This is not the case. The aircraft altitude is not a determining factor in whether an oblique is classified as high or low. Remember, the horizon is the determining factor; high sky, low no. As a matter of fact, most high-oblique photographs are made from a Figure 4-4.—High-oblique aerial photographs. 4-3


 


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