Geometry of Aerial Photography. I. Classification of Photographs In his book on aerial photo interpretation, Paine presents a dichotomous key for classifying aerial photography. The key is listed as follows: Photographs Terrestrial Aerial Vertical Oblique True Tilted High Low We can define vertical aerial photographs as a photo taken from an aerial platform (either moving or stationary) wherein the camera axis at the moment of exposure is truly vertical. 1. 2. In a high angle oblique, the apparent horizon is shown; while in a low angle oblique the apparent horizon is not shown.
The basic advantages of vertical air photos are: 1. 2. 3. 4. The advantages of an oblique aerial photograph include: 1. 2. 3. (Paine talks about clearance and cloud cover; but that's a tricky one (too cloudy for vertical but maybe enough clearance for an oblique). Three terms need defining here, they are Principal Point, Nadir and Isocenter. 1. 2. 3. On a true vertical aerial photograph all three of these would be at the same point. A quick review. II. Principles of Remote Sensing - Centre for Remote Imaging, Sensing and Processing, CRISP.
Dr. S. C. Liew Centre for Remote Imaging, Sensing and ProcessingNational University of SingaporeBlk S17/SOC1 Level 2, Lower Kent Ridge RoadSingapore 119260 Email: scliew@nus.edu.sg URL: www.crisp.nus.edu.sg © 1997, 2001 CRISP. All rights reserved. This tutorial is part of the "Space View of Asia, 2nd Edition" CD-ROM produced by the Centre for Remote Imaging, Sensing and Processing (CRISP) at the National University of Singapore.
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