in time. To answer this question, the progress made in geodetic 
   
and photogrammetric surveying and mapping to date and future 
     
  
  
  
  
  
  
  
   
  
  
  
  
   
   
   
  
   
   
  
needs must be considered. 
  
On a VorLd-wide level, it can be said that only about 
half of the land area of the world is covered by principal arcs 
of triangulation and Shoran and Hiren networks. Much less than 
half of the land Aron of the world is Covorad by first and © | s 
lower order triangulation. A sufficient density of ground control T 
for large scale mapping exists for only about one per cent of 
the land area of the world. In the sector of map conmiiation, 
it can be stated that mapping at the scale, 1:1,000,000 is à 
completed for about 85 per cent of the land arca of the world. | : 
The figures for the scale 1:250,000 are 35 per cent, for the 
1:100,000 scale range, 15 per cent, end for the scales 1:25,000 | E 
. and inrer. not more than 5 per cent. This last figure is also / 
representative of cadastral mapping. 
  
Considering that at many places, these operations 
started more than 50 years ago, it can be safely stated that 
  
the progress reached to date is rather modest and must be 
essentially accelerated in the future if an efficient economical 
and technical development of many countries should mot be 
handicapped by a too slow cartographic exploration.