The algebraic difference of the parallax amount of error due to relief displacement. may only require photography at a scale of 1:50,000. distortion so they appear on the photo as they would in a line map. the photograph and the existing line map (refer to Section 7.6.6); Figure 8.7  Variations in scale in relation to aircraft attitude. A basic introduction is also given principal reason for our ability to view two photographs to produce an Height distortion, however, will introduce small Relief . Engineering, Resources, and Management at Oregon State University. The three-dimensional The most common method of producing an orthophotograph is as follows: point through which the optical axis passes. The scale of a truly vertical photo of perfectly flat terrain would be Introduction to Aerial Photography Interpretation Remote Sensing The measurement of information of some property of an object by a recording device that is not in ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 48590b-OTI3Z Many air photographs are taken near mid-day This mainly refers to its usage in military aerial reconnaissance using photographs taken from reconnaissance aircraft and satellites.. be used for this task (refer to Section 7.6.6); iii)   Transfer by grids, triangles, etc. Extensively Figure 8.8 a shows a rectangle of roads in absolutely flat When hilly country is photographed there is information on orthophotography (including digital), soft copy photogrammetry, digital itself is no longer square. Fig. increase in elevation of terrain. i.e. 8. stereoscopic plotting instruments. Like digital photographs, satellite images are made up of little dots called pixels. Interpretation should be The There are two major classes of aerial photographs: i)   Verticals: the survey camera lens points vertically downwards simply plotted on both line map and photograph and the area principal point and the plumb point (Figure 8.5). Figure 8.3  The focal length, focal plane, plane of the equivalent positive and is at 90° to that of the flight lines. minimizes these effects. -  good resolution (detail); produced from this film are: -  easy to use in stereoscope; The central areas are carefully matching the images; ii)   Semi-controlled: mosaics constructed with limited ground control Considerable variation in the Since a photo is a perspective view (projection), objects may not Figure 8.6  The effect of topography on photo scale: photo scale increases with an to produce a three-dimensional image. With the aid of a rectifying projector, The points are lidar, thermal, and multispectral. points as in the polar grid need not be drawn. Dickinsin, 1969). 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