ESSEN
16.
The greatest problem for the photogrammetric measurement of t
longitudinal and transverse profiles is caused by the vegeta-
tion. It is then of a great importance that the aerial photo-
graphs are taken at that time of the year when the influence
of the vegetation is minimum. In the Northern hemisphere this
means that the photography should be carried out in the early
spring before the leaves arrive. This fact introduces a prob-
lem concerning the planning of the design process so that the
photogrammetric work will be required on the right part of the
year. In order to solve these problems together with other plan-
ning problems of similar character, netplanning of the type of
CPM etc. has been introduced for the design process. Planning
the design work according to this method is of a great impor-
tance not only for the photogrammetric part but also for stabili-
zing and making the whole process more effective.
In cases where the vegetation makes the use of photogrammetry
impossible for the numerical measurement, the gaps must be fil-
led by terrestrial methods. One of the problems of terrestrial © 0
measurement originates from the reading and accounting of the mea-
sured data. Wrong readings and wrong notations of data can easily
spoil a good work. The introduction of automatically registering
devices for the tacheometric measurement as Zeiss Reg Elta, see
fig % and AGA Geodimeter 700, see fig 4, means an interestina
step on the way to an instrument which will serve as a link for
the combination of photogrammetric and terrestrial measurement
of detailed numerical terrain data. It is to be hoped that this
trend of development will be pursued by the manufacturers of geo-
detic equipments.
An interesting system for the application of the combination of
photogrammetry, surveying, data processind and automatic plotting
has been developed for the Italian conditions at the Topography
and Geodesy Department of the Politecnic Institute of Torino, Italy, 2
in cooperation with a Highway Design consulting firm, IRI in Milan, '
Italy. e 9
The result introduced in the practical design work is presented
by G Inghilleri, L Ornati, S Dequal et. al. in (15).
