What is Photogrammetry?

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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.

Fundamental Principle
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.

Scale formulas
Photo scale=ab/AB=f/(H-h1)
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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  • nevin November 7, 2007 at 9:06 pm


  • PAVITHRA August 12, 2008 at 7:43 am

    Will this kind of survey is useful as i know this is not used by many.

  • sivakumar kakarla January 17, 2009 at 5:47 am

    We need detailed information about Photogrammetry.

    Sivakumar Kakarla

  • Devjyoti June 9, 2009 at 7:14 pm

    what is the basic principle of photogrammetry?
    tell me how it is use with detail mathematical expression.

  • sayeed July 15, 2010 at 10:14 am

    how to find the complete notes of survey

  • VInod April 20, 2014 at 5:35 am

    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.

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