17 
2 
PRESIDENT’S PREFACE 
Volume XII of the International Archives of Photogrammetry is now ready 
to be put into the hands of photogrammetrists all over the world. I hope that 
this volume will be a worthy link in the noble chain formed by its predecessors. 
The Archives do not only contain the Reports of the Congress Meetings: at 
the same time they give a clear and detailed review of the present state of 
photogrammetry. 
Closer study of this volume will reveal that it contains articles of more or less 
varied interest for larger or smaller groups of specialists. Some readers will 
probably be of the opinion that the work would have benefited from a more 
or less severe elimination. The Congress Board has considered this problem, 
and found that the present Statutes hardly give it the right to make eliminations 
which in any case would be of a more or less subjective character. It must not 
be forgotten that the dominant purpose of the Archives is to constitute a 
historical document of the Congresses and of the contemporary state of photo 
grammetry. It must also be remembered that present-day readers are much 
more numerous than ever before and include not only scientists, but also practi 
cians and various other more or less specialized categories of photogrammetrists. 
A confrontation of this volume of the xWehives with the preceding ones leaves 
us in no doubt that photogrammetry has developed at an astounding speed. 
Starting from modest origins, it has now become a science highly esteemed 
and appreciated by all nations, and an indispensable instrument in human 
evolution. 
Now that this volume is placed before the photogrammetrists of the world, 
the great task of organising the VIII Congress, entrusted to Sweden at Washing 
ton four years ago, is at last accomplished. Much toil, and many cares, now 
belong to the past. But from this Congress a dominating and very pleasant 
feeling remains with me — the memory of much kindness and friendliness on 
the part of the participants, thanks to whom all the meetings and other func 
tions ran so smoothly. 
It would be impossible for me to restrain my feelings of gratitude towards 
all those who by their work or in other ways contributed to the success of the 
Congress. First and foremost I wish to express my thanks to my colleagues in 
the Congress Board, to their assistants and other voluntary Congress officers, 
also of course to the Commission Boards, and last but not least to our excellent 
professional and honorary interpreters. My gratitude for the skilful and devoted 
services of these persons is none the less if, for practical reasons, I do not 
mention them all here by name, but refer instead to page 92 of this volume 
where their names are to be found in an extract from the Congress Programme. 
I extend warm and respectful thanks to Iiis Majesty the King who graciously 
consented to grant the Congress his patronage. 
The Swedish government has supported the Congress financially and in other 
ways, and the Municipal Authority of Stockholm has kindly placed premises 
and other requisites at our disposal. The Fund for Forestry Research and 
certain private companies have given the Congress economic support. Some 
governmental institutions, especially the Land Survey Board, the Geographical 
Survey Office, and the Royal Institute of Technology, which, in virtue of their 
extensive contacts with photogrammetry may well be counted as members of 
the »photogrammetric family» have in many different ways assisted the 
Congress Board in its work, and I have great pleasure in extending sincere 
thanks to them all. Patrik Mogensen