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1077-— 
Qualitative ranking produced so many different subjects that is was 
impossible to gain any sensible picture. The subjects were therefore ranked 
according to sort of use, whereby it is attempted to contruct a classifica- 
tion which becomes a kind of semantic scale indicating the intensity 
(not frequency) with which the material is used. This classification is 
as follows: 
1. cartographic : use for mapping 
2. map substitute: use as background for design, plan evaluation, fieldwork 
etce 
3. illustrative: use as background for public relation, participation and 
publication 
Le aû hoc: use for incidental extraction of information, with a particular 
Objective and for documentation 
5. specific: use for complete extraction of certain information in a certain 
area, such as in traffic research, analysis of roof forms or analysis 
of urban "green areas" 
6. systematic: use ad basis for a regular system of information collec- 
tion. 
Ranking of the subjects according to this classification produces 
the pictur: given 
in figure 8: 
  
  
  
  
  
  
  
  
  
  
  
  
| 
ADMIN. LEVEL | CARTC- MAP-SUB- | ILLUSTRA- | AD HOC [SPECIFIC | SYSTE 
GRAPHIC STITUTE | TIVE MATIC 
NATIONAL 1 1 2 
PROVINCIAL 5 4 5 
LOCAL 15 13 j] % 31 5 
++ eee sm eee ~~ ame ewe. a 
NON GOVT. 3 5 1 1 3 
TOTAL 28 19 16 19 45 5 
Figure 8 SORT OF USE 
The following conclusions can be drawn from this table: 
- The use of aerial photography becomes more specific as the administrative 
task becomes less abstract.