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weather conditions. The colour is also more difficult to 
process, and being reversal film it is generally used direct. 
Subsequent prints or second generation diapositives tend to 
be of inferior quality and the production of consistent material 
is very difficult. This is very important if, as is usually 
the case, many frames of photography are involved and subtle 
differences in shade or tone are significant. Whether or not 
it is worth the extra cost and problems involved in using 
colour infra red film depends on the extent to which vegetation, 
surface cover and condition are important. 
As Figure 5 shows, if only the major open space types are 
to be mapped then there is virtually no advantage in using 
colour infra red film. If however details of the vegetation 
type, cover and condition are significant (as seen in Figures 
6 and 11) then the use of colour infra red film is essential. 
Subsequent Stages 
Having established the need to use colour infra red film to 
meet the particular information needs of the planning authority 
co-operating in this project, work has now gone ahead into the 
subsequent stages. 
Eleven sample areas, each of kKm? have been systematically 
surveyed and the information digitised. The amounts of each 
type of open space have been printed out on the computer, and 
calcomp maps have been produced showing the spatial distribution 
of open space for each area. 
Hence it is possible to relate the provision of existing open 
space and its quality of maintenance or management, with the 
Socio economic status of the population. Some very interesting 
relationships are emerging which are significant to the present 
land/man relationships and to the future redevelopment planning 
of urban areas.