Fig. 3 Grey scale representation of a urban building model. 
Presentation of the building height as per grey scale value. 
A high building appears brighter than lower buildings (or part thereof). 
5. SUMMARY 
The acquisition of building models can be carried out 
using digital photogrammetry with high quality and more 
economically than with conventional methods. 
At present, digital building models are being increasingly 
used by operators of mobile telephone communications 
as a data basis for the calculation of radio planning 
models and by public authorities for modelling emissions 
of various types. 
As the costs of digital building models (photogrammetric 
products) have fallen significantly through the use of 
digital photogrammetry, it will in future be possible to 
integrate this data in GIS applications in other fields. 
It is, for example, conceivable that Geographic Informa- 
tion Systems with a considerable depth of information can 
be built up at local authority level in which building data, 
orthoimages, relief models and vegetation can be linked 
with further information such as road data, waters, local 
boundaries or post code districts for planning and 
analytical purposes. 
320 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996 
  
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