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5.7 Coordinate system definition 
Coordinates of control points are determined in the local 
coordinate system, which is located arbitrary in relation to 
object (XI, Yl at Figure 5). Whenever it is possible, the local 
coordinate system should be unique for several closely located 
or connected objects. It is not necessary to materialize surveying 
points for realization of local coordinate system (points A, B 
and C at Figure 5) because it is done indirectly, by 
determination of control points located on facades. The final 
coordinate system (Yt, Zt at Figure 5) is defined by regression 
line calculated by using certain number of points located on 
facades (Yt) and perpendicular on it (Zt) 
  
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object coordinate system 
Figure 5: Transformation of local (Yl XI) into object 
coordinate system (Yt, Xt) 
5.8 Control point selection 
Control points should be located on the object. They can be 
artificially marked or chosen from clear facade details (Figure 
6). In both cases, the position of control points should be well 
described. 
  
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Figure 6: Control point selection 
    
  
The best way to make description of control point position is 
digital (illustrated at Figure 6). Collected information about all 
control points of one object makes the catalogue of control 
points. 
5.9 Control point determination 
With appearance of reflectorless total station, determination of 
control points for the needs of technical documentation is 
significantly improved in terms of efficiency and reliability. 
Standard possibilities for automatic data registration, attribute 
codification and automatic transfer of data into computer also 
contribute to this issue. Accuracy of control points now depends 
more on proper selection of control points then accuracy of 
linear and angular field measurements. 
Considering application of perspective bundles, the number of 
necessary control points is significantly reduced comparing to 
those required by measurements of independent stereo pairs. 
Nevertheless, the function of points defined by surveying 
should also be a control one, especially for very sensitive object 
details (points striking out, important constructive details, peak 
elevation, etc). The need for more reliable points is increased,