recorder allows not only a contourline of 50 meters but even 50 feet would be possible,
without any conflict in contouring between adjacent models.
I consider this aerial triangulation of the southern half of Suriname as an indication
"what can be obtained if we use the modern tools". Replacing in a case like this the wide
angle RC 5A by the super wide angle RC 9 and adding to the A.P.R. and statoscope also
a horizon camera the result would be even better and could have been obtained with less
photography since the scale 1 : 75.000 would have been entirely sufficient in this tropical
jungle.
In addition to the two blocks Ia and Ib, table 4 contains 6 other blocks, for which the
the boundary and 4 points determined in block Ia, the latter points cannot be bad in
absolute position since in Ib the absolute mean square error in these points of 16,0 m
was about the same as for the known points in block Ia.
The adjustment of heights was in this case an entirely different problem, since the
airborne profil recorder gave a large number of ground control points. For this reason the
height adjustment has not been carried out by means of the analogue computer but in a
normal numerical way. The relative mean square error of 3,8 meters derived from the
difference in height in common points of adjacent strips can be considered as a proof, that
the combination of aerial triangulation in good universal plotters with the airborne profil
TABLE 4
Block nr. Ia Ib VII
|
4
a
Area in sq.km 44.500 10.500 21.000 [ns ; St. 160 — sh + 200
a tropical forest tropical forest tropical desert topical harbour in tropical river and densily cultivated densily cultivated hilly, partly
fesert roads cultivated
purpose general information | general information | irrigation fanning harbour canalization and roads | amelioration planology Irrigation
scale of maps 1 : 100.000 1 : 100.000 1:25.000 | !: 10.000 1 : 5.000 1 : 2.000 1 : 1.000 1 : 5.000
contourline interval 50 m 50 m 5m | 5m lm
Photography Scale of photographs 1 : 40.000 | : 40.000 | : 30.000 Malt ROH 1 : 10.000 I : 10.000 I : 8.000 1 : 8.000
4600m | 1800 m 1600 m 1700 m 1380 m + 1550 m
lild Autograph A7 Stereocartografo Wild Autograph A5 Wild Autograph A5 Wild Autograph A7
| Santoni IV
1:12.500 | 1:5.000 ] : 5.000 1 : 4.000 1:3.000 1: 3.000
43 | 6 6 18 4 8
73 62 424 22 214
6 points 6 points 6 points 6 points 9 points
Flying height above sea-level 6100 m 6100 m
Instrumental Instrument Wild Autograph A7 | Wild Autograph A7 | Wild Autograph A
Triangulation Scale of model 1: 415:000 115.000
nr. of strips 96 20
nr. of pairs 2752 646 1752
Num. Rel. Orientation 6 points 6 points 6 points
7 + 140 | 21 27 273 6 99
Groundcontrol Number 7 lod
Xland: Y Nature: details of terrain Astronomical Astronomical Geod. survey fac survey Geod. survey Geod. survey Geod. survey Geod. survey
m
——
d- 27 35
Groundcontrol Number + 160 + 40 + 220 ;
levelling levelling
Height Nature Airborne Prof. Rec. | Airborne Prof. Rec. | Levelling
SON
limerical Numerical Numerical Analogue Computer Analogue Computer
Numerical Numerical
Computation Coordinates X and Y Analogue Computer | Analogue Computer | Slotted templets
method Height H. Numerical Numerical Numerical
Analogue Computer | Nr. of models persection 18 18
Dr. Jerie (X and Y) | Nr. of sections 128 30
Nr. of controlpoints 7 7
63 min 76 min
110 min 173 min
Required time for In triangulation instrument 56 min 56 min
one model Computation X and Y 58 min 58 min
Computation Height 41 min 41 min
+ 0,03 m + 0,08 m
M
Absolute) 4+ 30 m !) + 30 m1)
Absolute) + 5m + 5m
) +
) +
Pr
3333483
m
Mean square Errors (| X and Y
Groundcontrol | H
+ 0,22 m + 0,16 m
>
X and Y (Absolute + 15,4 m 16,0 m
5to10m
Photogrammetric
5to 10m
+ 0,13 m + 0,10 m
>
X and Y (Relative) + 58m 17 0
Relative) 5,4 m + 54m
H- HE HE H-H-H-
OcOoeooco
lo Go C Gi C
m
(
(
points | H (Absolute
(
(
H
1) Deflection of plumbline unknown. The inner precision of the astrofixes corresponds with about 30 m.
18
