Jauregui, Luis M. 
  
4.2 Digital photogrammetric restitution 
Through digital restitution, the coordinates X, Y, Z of every point representing the building is determined. In this case 
no reference plane is used, but a coordinates reference system, in which all measurements are performed. When using 
analogue plotting instruments, as in our case, digital restitution is done by means of adapting analogue to digital 
converters to the instrument, and by means of an electronic interface the digital output coordinates are send to the 
computer (PC) where they are processed by a CAD package, as AutoCad ™ for example, in order to produce a digital 
drawing. Figures 2 and 3 shows an example of a digital restitution. This is a detailed survey of the Congress building 
in Caracas, Venezuela, in which all features of the structure has to be represented in a 3-D way using AutoCad ™, in 
order to create files with all the detailed geometrical information. The plotting scale used was 1/25. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Figure 2. Partial front view of digital restitution of Congress Building, Caracas, Venezuela. 
  
  
  
  
  
  
  
  
  
  
Figure 3. Details of fagade shown in figure 2. 
4.3 Lineal restitution superimposed on rectified digital images 
As the terrestrial photogrammetry includes works of restitution of monuments of historical interest in some projects, it 
was needed to do the restitution of façades which are represented only by its contour or by the limits that defines the 
construction. Due to the simplicity of then, but their richness in texture, they deserve a better representation than the 
lineal one. 
With the advance in technology, we can make use of powerful computers, CAD and digital image editing or processing 
programs and peripherals as scanners and plotters of photographical quality, to make possible today, the union between 
the classical techniques and the photographical rectification, in order to offer a product similar to a picture in their 
general aspect, but with the geometrical characteristics of a plane. To achieve this kind of geometrically correct images, 
two classes of data have to be jointed: The linear map obtained from the restitution of photographs, and the digital 
image of that pictures. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000. 403