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    Introduction to Remote Sensing
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    Which equipments are used in interpreting air photos?
    In air photo interpretation of maps, stereoscopes and sketch masters are mostly used. Stereoscope comprises two lenses placed at the same plane termed as pocket stereoscope and mirror stereoscope.
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    What are the major types of air photographs?
    Air photographs can be grouped in five types.

    1. Vertical 2. Horizontal 3. Oblique

    4. Convergent 5. Trimetrogen.

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    What is remote sensing ?

    Remote sensing is the science of gathering information about objects from a distance without coming into physical contact with them. It thus include data gathered through photographs taken from air planes and satellites.
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    What is meant by photogrammetry ?
    The technique of obtaining information from photographs is called photogrammetry.
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    What is sensor ?
     Sensor is another parameter to determine the types of remote sensing. According to the sensor remote sensing is of two types.

    1. Photographic 2. Non-photographic.

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