There was also a need of rationalization, concerning the legal reallot 
ment of landed estates. During a succession of years different methods 
of photogrammetric mapping for such a purpose were tested. In 1954 
the investigations led to a new method, that gave rise to essential ad 
vantages. This method is a combination between geodetic and photo 
grammetric methods with the use of photographic interpretation but it 
is also a many-sided use of photogrammetry at reallotment. In connec 
tion with it an investigation was also made to use helicopters. 
The new method could not be tested in practice until 1955, and only 
partially, within an area of about 77 300 hectares in the most northern 
parts of Sweden. The result was that costs of the two operations of 
work, mapping out and land appraisal, could be diminished to about 
1 /10th of the costs of the corresponding operations of the old method. 
Helicopters were used at the new method but their use was facilitated 
by the natural conditions. So it is to be expected that the reduction of 
costs by using helicopter in the middle and south parts of Sweden will 
not be so big. During the years 1948—1955 the Central Office for real 
lotment purpose plotted stereoscopically (by older methods) 47 maps at 
the scales of 1:2 000, 1:4 000, 1:8 000 and 1:10 000, together covering 
about 56 000 hectars. 
It became apparent, that photogrammetry is a significant tool for the 
rationalization of the technical activity of the Land Survey. Photogram 
metry, especially photographic interpretation, is also an essential aid 
when projecting systems of roads and sewers, when planning of farms, 
forestry and urban areas and also when inventorying and appraising 
land, especially forested land. The possibilities of using photogrammetry 
at the land survey activity caused the Land Survey Board to 'propose 
special photogrammetric standards of accuracy in the proposal for the 
new measuring ordinance. So photogrammetric and geodetic surveying 
are placed side by side in that proposal. 
From summer 1956 the Central Office has at its own disposal five 
stereo plotters namely the stereo autographs Wild A 5, A 6, A 7, A 8 
and Zeiss Stereotop, the last one a modern plotter of third order. 
The photogrammetric activity of the Swedish Land Survey was ori 
ginally built up with the guidance of methods and experiences abroad, 
especially from Switzerland. However, it was necessary to adapt them 
to Swedish conditions. Later on it was possible to develop more original 
photogrammetric methods within the Land Survey. Some experiences 
from the use of those methods are accounted for in this issue of the 
Swedish Land Survey Review. They are one contribution of the Swe 
dish Land Survey to the international exchange of ideas and experien 
ces, that is the necessary basis for the development of photogrammetry 
and that also is the purpose of the VIII International Congress of Pho 
togrammetry 1956 in Stockholm.