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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.