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Photogrammetry is a technique used in surveying to measure the three dimensional coordinates with the help of photography. It is used for the purpose of measurements.
Triangulation is the fundamental principle used by photogrammetry. In this technique, we take photographs from atleast two different locations. The purpose of taking pictures from more than 2 points is to create what engineers call “lines of sight.” Once these lines of sight are prepared, we join them to locate a point where they meet and thus calculate the coordinates of the desired point.
where f =focal length of lens, in (m)
H =flying height of airplane above datum (usually mean sea level), ft (m)
h1 =elevation of point, line, or area with respect to datum, ft (m)
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6 comments on "What is Photogrammetry?"
Will this kind of survey is useful as i know this is not used by many.
We need detailed information about Photogrammetry.
what is the basic principle of photogrammetry?
tell me how it is use with detail mathematical expression.
how to find the complete notes of survey
Photogrammetry is the art and Science of without toching unkown area information finding with respective scale. But no professional vaules in India. Seeking to below Educational qualification persons also doing this technology and Campanies also paying very less salary. so Plz fullfill this. thankings to all Photogrammetry professionals.