1022. = 
‘Developed Areas' for this compilation consist of all areas of continuous 
development. Development includes all areas covered by bricks and mortar 
or structures of other materials such as transportation features, as well 
as all buildings together with associated land-uses and such open spaces 
as exist primarily for urban uses. Within developed areas the following 
broad land-use groups are identified and defined: 
A Predominantly residential use. 
B Predominantly industrial and/or commercial use. 
C Predominantly educational/community/health/indoor 
recreational use. 
D Transport use. 
B 'Urban' open space. 
These land-use groups were defined in terms of consistently reliable 
information which can be obtained from using both the aerial photography 
and Ordnance Survey 1:50,000 map sheets rather than in terms of any ideal 
classification suitable for planning purposes. The land-use groups, with 
minor exceptions, are based on aggregations of the sub-groups of the 
National Land Use Classification (NLUC). A full description of individual 
land-uses in each group is provided in ‘Explanatory Notes' which accompany 
each overlay to the Ordnance Survey map sheet. 
The NLUC is based primarily on activities which cannot be consistently 
jdentified from aerial photographs, with the result that these broad 
categories do not wholly relate to the NLUC orders. Many of these NLUC 
activities include similar activities taking place both inside buildings 
and out-of-doors. The five broad categories jdentified in the DOE project 
are, because of the source of information, essentially land uses in the 
physical sense. Interpretation is made more difficult by the problem of 
form and function since many buildings, purpose built for one function, have 
changed that function whilst retaining their original form, and others may 
be subject to multiple use. The 'Space Use Map' of Enschede, for example, 
(Hofstee, 1976) involved considerable field-work to overcome this problem. 
An important consideration to be decided in any survey using remote sensing 
is the amount of secondary sources to be used as well as photographs. It 
was a major aim of the project that the interpretation and mapping should 
rely solely on photographs and maps and not to resort to any field-survey, 
even for checking or filling in gaps where the photographs were inadequate. 
The DOE, however, carried out spot checks to ensure that the Standard of 
interpretation was maintained at the required level, but the work itself was 
restricted to the use of photographs and maps. 
The minimum size threshold 
  
In the DOE project all 'developed areas' of 5 ha and above have been mapped. 
Three main constraints were taken into account in choosing this threshold: 
i. Although it is possible to identify land-use parcels below 
5 ha at the 1:60,000 scale, problems of consistent recognition 
arise. 
      
   
  
  
  
   
   
   
   
    
   
  
   
   
  
   
   
  
  
  
   
    
   
   
   
  
  
  
  
  
  
  
   
  
   
   
     
   
    
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