Digital Photogrammetry, which is also, addressed as soft
copy Photogrammetry emearged gradually between 1982 to 1990. Developments in
soft copy Photogrammetry have accelerated and innovations towards softcopy
systems is driven not by Photogrammetry, but by computer technology. The
softcopy Photogrammetry is a symbol for new philosophy in Photogrammetry, which
has changed the way of processing, performing and distributing the
photogrammetric products.
The fundamental features are the fully digital environment
using digital images and the production of digital output in an interactive and
automated fashion. With the universal tool of a softcopy Photogrammetric
workstation, even a non-photogrammetrist can generate 3D data from those image
products in an accurate, reliable way with 3D data consisting not only of pure
co-ordinates, but of meaningful semantic descriptions of objects.
A softcopy Photogrammetry system can handle many different
data sources in mapping and industrial applications. It is a tool for
integrating disciplines and applications using the same hardware platform. The
application areas can be broadened by users. A digital photogrammetric
workstation is not necessarily a part of GIS or remote sensing system; it can
be vice-versa as well.
Advantages of softcopy system :
Most of the mapping organizations choose to invest in the
softcopy systems because of its efficiency and price/performance of the
softcopy systems in producing digital orthos. Digital ortho production was the
most common application and the huge reduction in price offered by softcopy
versions the analogue ortho systems was a major factor.
Another major reason was the potential of images matching
using correlation to assist the operator in DEM data capture.
The other advantages of digital photogrammetric workstations
are
No high precision optical/mechanical components required.
No regular instrument calibration required.
Digital images are stable.
Images can be loaded with out manual operation.
The stereo model can changed ‘on the fly’
An optimum image presentation can be chosen for human
interpretation.
Online stereoscopic measurements are possible.
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