Chapter Chosen
Introduction to Aerial Photographs
Book Chosen
Practical Work in Geography
Subject Chosen
Geography
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What is principal point?
Principal Point : The foot of the perpendicular drawn from the camera lens centre on the photo plane.
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What is scale of aerial photographs ?
The Scale of Aerial Photographs : The concept of scale for aerial photographs is much the same as that of a map. Scale is the ratio of a distance on an aerial photograph, the distances between the same two planes on the ground in the real world. It can be expressed in unit equivalents like 1 cm = 1,000 km (or 12,000 inches) or as a representative fraction (1 : 100000).
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What is the geometry of aerial photographs ?
To understand the geometry of an aerial photograph it is important to appreciated the orientation of the photography with respect to the ground i.e. the way the rays connect or project on the ground in relation to the ground representation.
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Aerial Photograph | Map |
• It is a central projection. | • It is an orthogonal projection. |
• The scale of the photograph is not uniform. | • The scale of the map is uniform throughout the map extent. |
• Enlargement/reduction does not change the contents of the photographs and can easily be carried out. | • Enlargement/reduction of the maps involves redrawing it afresh. |
• Aerial photography holds good for inaccessible and inhospitable areas. | • The mapping of inaccessible and inhospitable areas is very difficult and sometimes it becomes impossible. |
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Give the types of aerial photographs.
The types of photographs are :
1.Vertical photographs
2.Low oblique
3.High oblique.
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