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Q 
The two government agencies which are directly in charge of map-making, the Geographic and Cadastral 
Institute (I. G. C.) and the Army Map Service, have met this need by the intensive use of aerial triangulation 
methods, which both increase output and allow stockpiling of useful data in their files. 
These agencies use both their own programs and universally recognized ones such as Brucklacher, Schutt, 
and so on, processed by a variety of computer models, for the correction of errors. 
5. Plotting 
The largest map and chart output during the period in question was obtained by analogical plotting. Its 
size in hectares is shown in the following comparative table: 
  
  
  
  
  
SCALES 
PERIOD 
1:500 to 1:1,000 1:2,000 to 1:5,000 Over 1:10,000 TOTAL 
1960-1964 80,269 1,600,170 2,116,500 3,796,939 
1964-1968 509,900 6,293,570 8,961,000 15,764,470 
1968-1972 830,600 9,650,000 12,350,000 
  
  
  
  
  
  
  
The government agencies which count a photogrammetric service among their offices are the following: 
— Geographical and Cadastral Institute. 
— Army Map Service. 
— Mapping and Photographic Service of the Air Force. 
— Central Bureau of Roads. 
— Central Bureau of Hydraulic Works. 
— I R. Y. D. A. 
— Provincial Government Office of Barcelona. 
— Provincial Government Office of Guipüzcoa. 
— Provincial Government Office of Vizcaya. 
The following private concerns also engage in this type of activities: 
— AEROGRAM. 
— A. PETIT. 
— CETA. 
— ESTEREOCARTO. 
— ESTEREOTOPO. 
— ESTUDIO TOPOGRAFICO. 
— GEOFASA. 
— GEOFOTO. 
— IBEROCARTO. 
— ICAN. 
— INCAR. 
— LEM. 
— TICSA. 
— TFA.