SPECIAL PROJECTS 
The following two projects have been selected as being representative of the © e 
large number of reported mapping projects of special interest. 
In Mexico, a new government agency has been established with the aim of mapping 
the country (2 million sa. Km) within a period of 10 years. The programme 
requires the simultaneous production of five different editions of the 
1:50.000 maps, namely for topographic, geologic, land use, soils and agricultural 
purposes. 
The U.S.A. reports the execution of a significant mapping project involving 
the simultaneous analytical block adjustment of various scales of existing 
photography. For interpretation purposes, the project also included infra-red 
photography, infra-red and ultraviolet scanning and a terrain probing technique 
developed by the contractor. Whilst the results of the latter were marginal, 
the other sensors proved to be of significant value. 
TECHNICAL SPECIFICATIONS 
  
a) Multi-purpose mapping 
Whilst nearly all mapping agencies have to adhere to national specifications eo e 
established in order to fulfil requirements in terms of map standard and 
  
10. 
content, an encouraging trend is reported in countries such as Mexico, 
Netherlands, South Africa and the U.K. towards a more critical examination 
of these specifications. In the Netherlands, user requirements concerning 
map content are determined by means of questionnaires and, where feasible, 
these will be incorporated in the product. South Africa, Sweden and the U.S.A. 
report revisions being made to their specifications, in the latter case, only 
in terms of the resolution of photography for the production of orthophoto 
maps. 
b) Special purpose mapping 
  
Although most countries report that special purpose mapping is carried out 
to suit the specific requirements of the user, nevertheless both South 
Africa and the United Kingdom report that the user is becoming more critical 
and demanding in the private sector, there being a marked increase in the 
amount of discussion between marketing staff and potential map users with 
respect to technical specifications. | e & 
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