3)
D)
N 1)
2)
ESSE EMO
ER
4)
5)
6) Hagen, T. und Rutishauser, H.: Ueber die Deformation virtueller Raum-
REPORT OF COMMISSION VII
about 10.000 km?. All taken by the Federal Office of Land Topography for
the drawing and supplementing of topographic maps.
Photographs taken with the Wild Cameras C2, RC 5 or RC 7 from altitudes
of 500 to 4000 m above ground, scales of photos from 1 :5000 to 1:15.000.
Surface photographed about 5600 km? by the Direction of the Federal Sur-
vey of Landed Property for drawing cadastral plans and for other purposes.
Photographs taken with the K 17 Camera with Metrogon (wide angle lens)
from a flying height of about 600 m above ground. Scales of pictures from
1:40.000 to 1:15.000. Wartime photographs covering the whole area of
Switzerland.
All further information as to cameras used, material of films, and plates,
aero-planes etc. is to be found in the Swiss Report of Section I (Photography
I and Navigation).
SWISS LITERATURE ON INTERPRETATION OF AIR PHOTOGRAPHS.
In recent years some authors in Switzerland have occupied themselves with
H methods of reading and interpreting air photographs and have published their
j experiences. We shall name these publications here below and briefly indicate
some of their contents.
Helbling, R.: ,,Die Anwendung der Photogrammetrie bei geologischen Kar-
tierungen". Contributions to the geological map of Switzerland, Berne 1938.
Helbling, R. ,,Photogeologische Studien”. Herausgegeben im Aufrag der
Eidg. Techn. Hochschule. Orell-Füssli, Zürich 1948.
Helbling herein exhaustively deals with the above-mentioned combination
of topographic and geological map drawing by means of photogrammetry
and preceding geological interpretation of terrestrial photographs. In the
remaining parts of the said studies photogrammetrical and geological ques-
tions not falling within the scope of this report are treated.
Imbof, E.: ,,Gelánde und Karte". Herausgegeben vom Eidg. Militár-depar-
tement. Eugen Rentsch-Verlag, Erlenbach-Zürich, 1950. French edition
»lerrain et Carte", 195].
A chapter of this book deals with reading and interpretation of air photo-
graphs: Comparison of horizontal with oblique and vertical photographs;
influence of favorable and unfavorable orientation of the vertical photo-
graph. Perspective setting of image parts, orientation of photographs with
respect to lighting, topographical setting of image parts. Some examples show
the connection between form and covering of the ground. The latter, mostly
quite distinct in the image, often reveals the form of the ground otherwise
only recognizable with difficulty. Another chapter deals with stereoscopic
observation of photographs.
Hagen, T. ,,Wissenschaftliche Luftbild-Interpretation". Communications of
the Institute of Geodesy of the Swiss Federal Institute of Technology, of
Zurich. Verlag Leemann, Zürich 1950. Sonderdruck aus ,,Geographica Hel-
veuca”, 1950.
Hagen, T. Das westliche Säntisgebirge photographisch geseben und bearbei-
tet”, Mitteilungen aus dem Geodätischen Institut an der Eidg. Techn. Hoch-
schule in Zürich, Verlag Leemann, Zürich 1952.
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