444 City surveys and those of urban settlements is at
a 1:1000 scale, while that of the aerial photographs
varies between 1:4000 and 1:6000.
The so-called PF-points are determined by photogrammetric
aerial triangulation. These photogrammetric points are
stabilized and marked prior to starting the aerial
photography work. Planimetric evaluation employs correc-
tostat paper, while relief evaluation makes use of
astralon foils fixed on the table. The latter is per-
formed by means of the minor control points of elevation
in-site measured in advance, by using 1 m distance:
contours, and by measuring the spot height figures.
During the period covered by this report, 1:1000 photo-
grammetric survey covered a total of 50 towns or urban
settlements, whith an overall area of about 250 000 ha.
4.5 Photogrammetry for engineering design
Photogrammetry renders considerable assistance to plan
and design the large-scale building and construction
activity carried on all over the country. Thus to pro-
mote and facilitate engineering desgin work a great
number of 1:200 - 1:5000 maps have been produced.
Such projects included the design and reconstruction of
industrial establishments, the design of new motorways
and railroad lines, the reconstruction of railway
stations, river control and canalization, survey of
mining areas including surface sites, survey and deve-
lopment of urban traffic Junctions. In many cases
aerial and ground photogrammetry had to be combined.
In designing roads and railways, the height of the
longitudinal and cross sections was also measured by
photogrammetric techniques. These data are then punch
taped for further electronic processing.
5. Non—-cartographic applications of photogrammetry
Many problems could be solved in this field by photo-
rammetry. "ome of the most interesting projects were
the enumeration is certainly not complete):
- Photogrammetric survey of monument buildings;
— Photographic display of monument street facades;
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