- 10 - e
orientation elements of the left-hand photograph of the
next-following model are considered equal to those of
the right-hand photograph of the preceding model, and
the coordinates of connecting points are used for changing
from the scale of the second model to thatoof the first
one. If errors of aerial pictures are accounted for,then
the accuracy of the network is raised,approximately, by
20%.
Block networks are plotted chiefly with the aid of.
isolated bundles without plotting terrain models, combiu-
ing the plotting with adjustment of the photogrammetric
network. Corrections to measured coordinates of picture
points are also taken into consideration, and the exteri-
or orientation elements, as obtained during the flight,
are taken in account as well.
COMMISSION IV. e
Photogrammetric map compilation.
In the USSR, the following map series and the
corresponding contour intervals are in use ;
Contour interval (m) for maps of different types
of terrain
Type of m — mmm tm mn oe rt em mn
tora 152 000 | 1:5 000 | 1:10 000 [1:25 000 [1:50 000 |1:100 000
Flat-plane . 0.5 0.5(1.0) 1.0 2.5 10 20
Plane rugged
and accidental
with prevailing
angles of slope
up to 6? 1 1(2) 2.5 (2.0) 5 10 20
F oothills and
highlands 2 5 5 5 10 20
Alpine - - - 10 20 40