PRINCIPLES OF AERIAL PHOTOGRAPHY

Photography is defined as the process of recording images by exposing light-sensitive film or array to light or other form of resolution. There are various principles of photography. Some of them are
CONTRAST
This is a measure of the distinctiveness of photographic tones. Contrast is affected by density which is the darkness of a negative. If the developed film has contrasting areas of varying degrees of darkness or density, the photograph will have distinctive tones. Contrast is poor when the shades of grey colour are not distinctive and are hardly distinguishable from one another. Poor contrast reduces the worth of the photograph for photo interpretation.
TONE
Different features of landscape have different reflection coefficients. In other words, the proportion of the amount of light energy falling on them that they reflect varies. It is the amount of light energy reflected from an object or a scene that camera records. The relative amount of light energy reflected from an object or scene as recorded on black and white photographs is called tone. In panchromatic black and white photographs tone is usually represented in varying shades of grey colour ranging from white to black. If an object reflects a lot of the incident light energy. It will appear light in tone. Tone reflects the reflection of a feature.
TEXTURE
This refers to the general appearance of an area as seen on the air photograph and is an aggregate or an overall expression of the whole aggregate arrangement of minute images that constitute the whole. Texture reflects structure.
PHOTO RESOLUTION
Image resolution is the detail an image holds. Higher resolution means more image detail. Resolution is the capability of the sensor to observe or measure the smallest object clearly with distinct boundaries. Image resolution can be measured in various ways. Basically, resolution quantifies how close lines can be to each other and still be visibly resolved. Resolution units can be tied to physical sizes. A pixel is actually a unit of the digital image. Resolution depends on the size of the pixel. With a given lens setting the smaller the size of the pixel, the higher the resolution will be and the clearer the object will be. Types of photo resolutions are:
1. Pixel resolution
2. Spatial resolution
3. Spectral resolution
4. Temporal resolution
5. Radiometric resolution

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