Photogrammetry and its types

American Society of Photogrammetry and Remote Sensing (ASPRS) has defined Photogrammetry as follows:

”Photogrammetry is the art, science, and technology of obtaining reliable information about physical objects and the environment through the processes of recording, measuring, and interpreting photographic images and patterns of electromagnetic radiant energy and other phenomena.” (ASPRS, 1980)

Analog Photogrammetry

Using optical, mechanical and electronical components, and where the images are hardcopies. Re-creates a 3D model for measurements in 3D space.

Analytical Photogrammetry

The 3D modelling is mathematical (not re-created) and measurements are made in the 2D images.

Digital Photogrammetry

Analytical solutions applied in digital images. Can also incorporate computer vision and digital image processing techniques. or Softcopy Photogrammetry.

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