meteorology, astronomy, medicine, animal sciences, petrography 
and mineralogy, glaciology, oceanography, etc. Thus, photogram- 
metry today is an interdisciplinary science end the problem of 
education in photogrammetry must be considered iu tho light of 
this developuent. 
There is no doubt that from the economical view-point, 
topographical photogrammetry continues to play the most 
important role at the present time as well as in the future. 
At this time, possibly 70 to 80% or even more of the photogran- 
metric activity is concentreted on topographical photogrammetry. 
If the economical significance of photogrammetry and its impact 
on education in photogrammetry are to be analysed, it is 
therefore essential to evaluate mainly the contribution of 
topographical photogrammetry to the national economy. In other 
words, the. required number of photogranmetrists and the number 
which must be educated per year on various levels and in various 
countries is Gorrelated to the significance of topographical 
photogrammetry in the overall technical and economical develop- 
ment of & country. 
To assess the economical significance of topographical 
| photogrammetry, it is necessory to stress the fact that no 
nation is able to achieve essential progress in technical and 
economical development without an appropriate cartographic 
preparation (photogrammetric surveying end map compilation) of