TABLE Ne 7 
TRIANGULATED BLOCKS WITH THE RADIAL METHOD 
  
  
Survey Flight 
purpose S ND | Nino: 
and position 
of control points 
in the block 
  
  
Instruments Time 
Reached 
Photo 
scale 
and flight 
altitude 
Total area Auxi- Methods 
liary 
equip- 
ments 
Country Organization Ground Adjustment 
chara cter- 
istics 
Block 
shape 
Map Cameras | used required precision 
scale 
  
  
  
PETS, 
11 
13 
  
BELGIUM 
FRANCE 
  
I.G.M. 
T.G.C. B. 
1:100.000 
mosaies 
1 : 20.000 
photo plans 
1 : 200.000 
1 : 100.000 
1 : 200.000 
I : 100.000 
1 : 200.000 
  
  
GERMANY 
IRAN 
AFRICA 
  
| 
Photogramme- 
trie G.m.b.H. 
München 
Hansa Luftbild 
| G.m.b.H. 
Münster 
Vermessungsbii- 
| ro N. Riipke 
Hamburg -Wan- 
dsbek 
Aerotecnica S.A. 
-mosaics 
-mosaics 
  
For photo- 
For photo- 
250.000 km? 
7.716 km? 
Ti 
276.070 km? 
Over 
1.000.000 km? 
420 km? 
170 plates 
80 km? 
100 plates 
2.000 km? 
80 plates 
4.000 km? 
1.800 plates 
000 km? 
blocks 
5. 
9 
3.500 km? 
1.500 km? 
20.000 km? 
  
4.500 m 
5.000 m 
for small 
scale 
2.500 m 
3.000 m 
for middle 
scale. 
1 : 40.000 
Strips of 150- 
400 km length 
Each block is 
of 13.000 - 
20.000 km? 
300 km x 
225 km 
  
  
  
  
| 
| 
|1 : 20.000 
1 : 10.000 |20strips flown| 
| 
| 
| 
| 
(16 central 
Istrips flown 
| E-W, 8 strips 
lat the E side, 
flown N-S 4 
strips at the 
|W side, flown 
| N-8 
| 
|E-W. 
  
Statoscope | Flat 
  
About 25-30 geode- 
tic points each 
square degree. 
The average distan- 
ce between points 
is of 20 km along 
the periphery of 
block and of 50 km 
inside the block. 
Signalized points 
Machine à fen- 
tes radiales 
Casella. 
Radial Seca- 
tor Zeiss 
the enlargement 
range per overlap 
  
l control points e- 
very 50 km along 
the periphery of 
block. 
Inside the block, 
the maximum di- 
stance is of 100 km. 
  
  
  
Control points are 
obtained from a 
1 : 50.000 scale map 
1 Control point e- 
very 4 km? 
1 control point e- 
very 30 km? 
Control points are 
obtained from maps 
through field - tra- 
versings, perpendi- 
cular to the direct- 
ion of flight: one 
ground - control 
point in each lateral 
overlap of successi- 
ve strips. Distance 
between the poly- 
gone: about 15 km 
Triangulation 
points with average 
mutual distance of 
4 km. 
Ground-control:| 
Radial 
tor R.S. ] 
Radial Seca- 
tor R.S. 1 
Radial Seca- 
tor R.S. 1 
| 
| 
| 
| 
| 
| 
| 
| 
| 
T =] 
  
  
Seca-| 
Determination of |450 hours per 
block of 
13.000 km? 
by means of « Ga- 
barits à fentes ra- 
diales » 
Mechanical method 
m + 0,4 mm at 
photo scale 
  
  
Blocks are done by 
slotted templet tri- 
langulation, using 
{the principal point 
as radial centre - 
Ithe point - transfer| 
- on contact paper- 
prints - was done 
stereoscopically. 
Slotted 
method 
templated | 
« Gabarits à fentes 
radiales » 
« Gabarits à fentes 
radiales » 
  
  
| 
|Preparation 
|point transfer 
|- 1 hour; ma- 
lking of tem- 
plets 0,4 hour; 
reading and 
Itabulating of 
{the coordina- 
Ites 0,25 hour 
|per photo- 
graph. 
  
Slotted | 
method | 
templated 
| 
m + 0,72 mm at 
photo scale. 
In accordance with 
the formula 
mp =0,0003a-+0,5 mm 
where a is the 
distance between 
control points at 
the photo scale. 
m + 0,86 mm