Photo interpretation and its applications

Photo interpretation and its applications

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  Manish Galav 11710834 Badal 11710052
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  DEFINITION • Identifying andrecognizing objects in the aerial photograph and then judging their significance in the photograph. • Oblique photographs are normally easy to interpret.
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  Factors to assessto identify a feature : Shape Theform of an object on an air photohelps to identify theobject. Regularuniform shapes often indicate a human involvement. Size A measure of theobject's surface area (e.g. single-lane vs. multi-lane highways). Tone/Colour The colourcharacteristics of an object, relative tootherobjects in the photo, are used toidentify the feature (e.g. sand has a bright tone, while waterusually has a dark tone; tree species can be determined by the colour of their leaves at certain times of the year).
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  Pattern  Similar toshape, the spatial arrangement of objects (e.g. row crops vs. pasture) is also useful to identify an object and its Shadow  A shadow provides information about the object's height, shape, and orientation (e.g. tree species). Texture  Texture is the frequency of the change in tone in the photographicimage. As the photoscale is reduced, the texture of the given object becomes progressivelyfinerand eventually dissapears.
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  Association/Site  Associating thepresence of one object with another,or relatingit to its environment,can help identify the object (e.g. industrial buildings often have accessto railwaysidings; nuclear power plantsare often locatedbeside large bodies of water).
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  Applications: Agriculture •crop type classification •Cropcondition classification •Crop yieldestimation •Mapping of soil characteristics •Mapping of soil managementpractices Forestry •Forestcover •Type of forest •Vegetation density •Deforestation •Forest fires
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  Aerial photograph takenwhileNuclearTesting in Pokhran, India