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Photogrammetry, a term composed of the greek
words for "light", "drawing", and "measuring",
is the discipline of mapping from aerial photography or satellite images.
As Paul R. Wolf writes: "Photogrammetry
may be defined as the art, science, and technology of obtaining reliable
information about physical objects and the environment through processes
of recording, measuring, and interpreting photographic images and patterns
of recorded radiant electromagnetic energy." [Paul R. Wolf, Ph.D.,
Elements of Photogrammetry, McGraw-Hill Book Company, 1974]
Photogrammetry provides the mathematical
infrastructure for the geometric correction of images and
the construction of large maps from many images.
This mathematical infrastructure becomes
more and more developed as digital processes are being used by mappers.
These processes may include the collection of digital images, the mapping
using soft-copy tools, and the real-time processing of mapping detail.
The "orthorectification" of images
is a pure photogrammetric application. This involves the removal of "relief
displacement" from images, so that image displacements due to problems
in perspective are corrected.
GeoCounsel is capable of building meaningful
specifications, and perform the corresponding
supervisory functions, for photogrammetric projects.
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