the "Propos 
°ying Ordin 
rtical and 
(e required 
.arge scale 
000 or lar 
lions of fo 
‘e usually | 
irveys. The 
" the four 
shed by 
dures basei 
eld establi 
models. 
the horizo 
ints would 
riangulati( 
quirements: 
i 
ll vary 2) 
bani 
cal control 
endicular | 
about 15 
Airborne l| 
ished by | 
rol by Ter: 
ar) signifi 
erage, 
rveyed coni 
establishé 
ques, and | 
techniques 
All horizd 
ed in the 
rcator Grid 
Union of Soviet 
Soc. Republics 
4 
16 
x 
- 70. 
Ground Control Points. 
Ad 5.1 
Ad 5.23 
Ad 5.1 
system. 
Central point is used occasionally. 
nd 
Adjusted to 2 order. 
Traverse: 1:7 500 or 2,23? VL 
L- traverse distance in 
miles 
Triangulation: 
1:75 000 mean closure A =5?? 
max. A -10?? 
Levelling: 0,05? VL 
L- length of the levelling line in 
miles. 
For maps 1:25 000 and 1:10 000 ho- 
rizontal ground control points are 
measured in 8 bases. The same for 
vertical points on 1:25 000 and 
1:10 000 and contour lines interval 
5 and 10m (usually identical with 
the horizontal ones). On the scales 
1:25 000 and 1:10 000 and 2,5m - 
contour lines the vertical points 
are always determined in pairs in 
4 bases. 
For mapping on the scales 1:5 OOO 
and 1:2 OOO the Instructions fix 
the distance between ground control 
points in 4-12 bases according to 
the accuracy required. When mapping 
on the scale 1:5 000 ana contour 
lines interval lm and 2m and on 
1:2 000 and interval 0,5 and lm each 
stereopair must be secured by 4 
elevation control points (basic). 
When the interval is larger (2m on