b) survey of medium-size objects (around one meter) - where 
tolerance allowed is of few tenth of millimeter - can be 
performed either through mechanical metrology or through 
photogrammetry 
c) survey of large-size objects (over one meter, such as 
complete car bodies) - where tolerance allowed is in the 
range of a few millimeters - falls definitely within the 
province of photogrammetry, as mechanical metrology would 
involve the use of very expensive equipment. 
In other words, we are inclined to believe that in some 
cases mechanical metrology only could be enough and appropria 
te; other problems could better be solved by photogrammetry. 
Buth there are also more complex situations, where measuring 
must be carried out using different techniques, such as for 
instance the case subject of our research, 
However, the choice of the type of instrument is also con 
ditioned by specific requirements (e.g. the object under sur- 
vey should not be touched, or it is mobile, etc.). 
Obviously, the required accuracy (for a few points of for 
the object as a whole) is fundamental and must be taken in due 
consideration. 
We deem it useful to add that while the survey of small 
and medium-size objects represents a matter of great interest, 
as much interest is taken in the survey of extra large objects 
such as cranes, ships, large machinery and equipment, etc. It 
is also true that survey does not always demand great accuracy: 
often it is meant to outline overall dimensions only. It fol- 
lows that Industrial Photogrammetry covers a wide range of ap 
plications. 
As compared with close range photogrammetry - of which it 
is an integral part - industrial photogrammetry presents some 
peculiarities worthy of attention: namely, the required preci 
sion should be carefully studied to be consistent with the who 
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