THE TWELFTH INTERNATIONAL CONGRESS OF PHOTOGRAMMETRY 
BRITISH NATIONAL REPORT FOR THE PERIOD 
January lst 1968 - December 31st 1971 
SECTION 1 
INTRODUCTION 
Applications of photogrammetry continue to grow in quantity and novelty. 
Perhaps the most interesting development is the large increase in applications 
to sciences other than land survey. In consequence of this development, taken 
together with the growing requirements for land surveys, the period under 
review marks an enormous increase of interest in photogrammetry in the 
academic field, The subject is now much more widely taught, and a sizeable 
section of this report is of necessity devoted to increased educational facilities 
now available. Due to a large increase in computer availability, digital 
techniques have grown considerably, and are extensively used in all fields. In 
land survey applications particularly, digital techniques are no longer only a 
matter of considerable interest: they have established a firm foothold, and are 
now used almost exclusively for the adjustment together of blocks of models, 
and may be said to have replaced graphical, optical and mechanical procedures 
used for this purpose in past periods. Digital models are also used, 
particularly in connection with road construction surveys. The number of 
plotting machines in use has grown considerably, and a new British plotting 
machine has been born. Of interest is the appearance of some maps with 
pictorial backgrounds, known as picto-maps, and in the photo mechanical 
procedures used in their production.