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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004
issue for investment cost analysis purposes that are made for
photogrammetric image acquisition. Typical investment costs
for founding an airborne imaging unit is given at Table 7.
Item Cost (US$)
Low 800000
Aircraft Medium 2500000
High 5000000
d Analog 600000
Digital 850000
Ground Hangar 1500000
Facilities Laboratory 800000
Table 7. Airborne imagery investment cost
It should be noted that aerial survey aircraft has to be modified
in order to make the aircraft suitable for camera mounting. This
modification includes opening a camera well on the bottom
fuselage and requires a series of operations over the electrical
system of the aircraft. The cost of the modification has been
added to the aircraft costs given above. Prices given in Table 7
are, of course, not the exact values but presented with the
intention of giving an idea about the amount of the procurement
costs of main items required by aerial survey system. Cost
varies according to the type of the aircraft and camera,
maintenance equipments in the hangar, quantity and quality of
the etc.
4. CONCLUSIONS
Aerial photography taken from aircraft is no longer the unique
option of the photogrammetry because both digital airborne and
spaceborne imagery are available at the market. Before
resolving the image acquisition source, administrative personnel
that are in charge of management have to evaluate the situation
from several aspects and decide for the cost efficient.
Today, satellite imagery has achieved to sub-meter resolution,
which is sufficient for some photogrammetric applications but
does not meet the needs of all, especially large-scale mapping.
In order to accomplish a productive use of the sources, users
have to make purpose targeted imagery selection, which implies
the acquisition of the most economic imagery that fits to the
aim of the production.
It can been concluded that aerial photography will continue for
large-scale mapping projects, however it should be noted that
imagery captured by the airborne digital cameras expose quite
good performance by means of both resolution and cost issues.
Digital vs. analog imagery comparison on the investment and
operational cost basis yields for the benefit of the digital camera
products.
Investment dimension of design, production and operation cost
of a multi purpose remote sensing satellite is fairly high. On the
other hand, light, designed for specific purpose and affordable
new generation earth observation satellites are gaining more
interest. Nevertheless, for photogrammetric purposes, it sounds
much wiser to acquire satellite imagery by purchasing from the
commercial satellite operators.
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Baltsavias, E P. 1999. (On the Performance of
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WWW.esa.com
www .optech.on.ca
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www.digitalglobe.com
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