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made to Mac Leod (19). This possibility is important when mea-
suring data for DTM:s based upon strings as contours and
terrain breaklines. It will also be a good aid for decreasing
the influence of gross errors as the control of the measure-
ments is facilitated. These facts, mentioned above, may play
an important role for the further development of the photo-
grammetric DTM-system.
The further development of the DTM should be coordinated with
the ideas on the development of automated or semiautomated sys-
tems for photogrammetric measurements and mapping. A step for-
ward in this connection is reported by Mac Leod in (19) concer-
ning a system for Semi Automated Mapping, where all the photo-
grammetric data are stored on a magnetic tape or disc.
It would be possible to develop the system for data collection
and registration so that the digitized photogrammetric data can
be used, stored on a magnetic tape or disc, for plotting or
other graphical display, for steering data for orthophoto-maps
as well as for different types of DTM:s. Before the photogram-
metric data are transformed, the systematic errors should be
corrected.
As such a development will be of an essential importance for
the future application of photogrammetry to Hichway Design the
problems around data collection, registration and storage should
be further studied during the next period.
4. Definition of the main and interesting problems for the
further development of the use of air photographs in
Highway Design
It was mentioned above that the development of the application
of photogrammetry to Highway Design during the period 1968-1972
mostly has concerned the introduction of the modern aids in new
countries and the terrestrial surveying technique for measuring
the required photogrammetric control.
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