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What is Photogrammetry?

Photogrammetry can be defined as the science of obtaining reliable measurements and producing maps from photography. Photogrammetric techniques are applied to accurately determine relationships of features on aerial photographs, including ground distances and angles, heights of objects, and terrain elevations.

When a vertical (taken directly above the land from the bottom of an airplane) aerial photo is taken, the only point on the scene that is directly below the camera axis is called the ground principal point. Lines drawn to connect marks located along opposite sides of the photo (fiducial marks) intersect precisely at the principal point. This relationship, together with the flying height and the camera, form the basic coordinate system used to quantify various elements of the image.

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