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