increased during the 1968-1972 period. Professionals
from several institutions have joined, which promoted
professional development. In 1970, a Hungarian delegation
of 20 attended the Symposium of the 7th Committee af
ISP, presented 1^5 papers, and participated in the work of
the international subcommittees.
Our working committee co-ordinates the activity of a
number of special fields, and promotes the development
of the methods employed. Results of this work can be
summarized as follows.
Photogeology is the professional field, above all, of
the different departments of the Hungarian National Geo-
logical Institute. Significant results could be achieved
by aerial photo interpretation in the 1:100000 geological
mapping of the Great Hungarian Plain by the discovery of
buried furrows and covered river bed courses, and by
detecting the boundaries between sand and clay areas. In
the highland of Northern Hungary, aerial photo interpre-
tation was used in 1:25000 geological mapping as the
stereo-photos could detect the frontiers of sedimentary
and volcanic rocks, lava and cinder banks, their gra-
dient, as well as the buried furrows and andesite seams.
Similarly aerial photographs were used for the 1210000
mapping and engineering geological survey of the Balaton
lake highland, and for the 1:25000 mapping of the
Tra ‚nedanubian Range.
A continuously en number of Hungarian professio-
nals are participating in the geological mapping and raw
material prospecting activities of the developing
countries, just; like in the development of their aerial
survey techniques, including Mongolia, Mali, Mauritania
Guinea, Chile, Peru, Algeria, Tanzania, Turkey, Cuba,
etc,
Geomorphologic aerial photo interpretation is associated,
above all, with the 1:10000 and 1:25000 geomorphological
maps, but can be made similarly good use of in the
research work on certain geomorphological problems.
Geomorphological research and mapping are carried on by
the Geographical Research Institute of the Hungarian
Academy of Sciences. These techniques were successfully
employed so far in valley and slope studies, investiga-
tions on river course erosion phenomena such as terraces
and runways, examinations of quicksand forms and
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