ELLE 
Vertic. 
+ 
=0, 20m 
+ 
+ 
-0,50m 
  
m/km 
t. int. 9 
trilatera~ 
stance 
- 64 m 
  
   
Ground Control Points 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Country Org) Sl 5.218 5.21b 5.2lc 5.02 5,23 
Nos 
Rhodesia i of 4 | Normally | Never | Occasio-| Yes 1:5 000 xmyszu- 15 cm 
I nally 
(trig. 
points 
scarce) 
Roumania | 1 4 70% univd 50% 30% Yes Horizontal = 0,30 m 
me | photo-| univ.m. + = 
50% pho- pie Vertical 0,20-0,30 m 
tople (depends on slope) 
Spain 1 Mine 40% No 60% Yes T O,lm in the scale of map 
| 4 
Sweden 3 5-8 Large No Small 
scales scales Yes Preliminary in specifications 
2 6-9 Urban No AT and Yes Two accuracy classes, see 
purpo- good, "Proposal for & new Swedish Survey- 
Ses for ing Ordinance" 
115000 ng : 
to 
1:25000 
Switzer- + 
land 1 4-8 80-90% No 20=10% Yes =0,1 mm in i. or specified in 
every case. 
Tanzania |1 3 ho- | Yes No Yes Yes 1:2 500 : 15,2 cm 
riz. 1:5 O00 = 30,5 cm 
vert. 
Thailand [1 |[As few| Yes Yes Yes Yes | 1°* order 1/25 000 Me 
as post nd 
sible T order 1/10 000 HS 
3 order 1/5 000 M 
Tunisia 1 Min.4 | Yes No No Yes Horiz. - 0,30mm (M) 
max. 9 = : 
Vert. variable