photo-maps and photogrammetric line maps, aerial triangulations in the
Autograph A 5, and also terrestrial photogrammetric work. Control
work is done by graphical and mechanical radial triangulation, and to
some extent by determining coordinates in stereoscopic instruments.
The instruments available to the Section are
Wild Autograph A 5
Zeiss Stereopantometer
Mirror Stereoscopes with Stereometers
Oude Delft Scanning Stereoscope
Zeiss Rectifiers SEG I and IV
Odencrants Rectifiers
Zeiss Sketch Master
Equipments for mechanical radial triangulation (Lazy Daisy and
Slotted Templates).
The Boliden Mining Company
At the Prospecting Department, there is a special section for airborne
prospecting under the Research Engineer. This section takes air pho
tographs for the whole Company from a plane of the type De Havilland
Rapide Seeplane with a simple camera of the Eagle F 24 type. As a
rule the scale is 1:25 000. The activity of this work is very limited, and
its annual output being less than 500 pictures.
The photos are in the first place intended for prospecting. They are
used as stereo-pictures for geological photo-interpretation in a simple
stereoscope, or as mosaics for air-navigational purposes.
The photos are also used for primary planning of ways and mines.
For other photogrammetric adaptations, however, the Company applies
to contractors out by the Company.
D. Institutions mainly using Air Photogrammetric Pictures and
Maps for Agricultural and Forestry Purposes
The Royal Board of Agriculture and the Provincial Agricultural
Organization
Photogrammetric material is very extensively used by the Board of
Agriculture and the Provincial Agricultural Organizations in planning
the rationalization of farming and in dealing with matters touching the
agricultural policy as expressed in the current laws on Land Purchase.
It is also used to some extent in drainage operations.
The Economic Map, scale 1:10 000, or —- if required — enlarge
ments of this are used for these purposes in already mapped districts.
Photographs, generally rectified, are used when such maps are not
available.
