-0.001 
0.008 
0.009 
-0.004 
-0.009 
0.000 
Wo NM 
0.003 
-0.010 
0.003 
ÉDOVVE 
10.797 
70.776 
69.272 
30.040 
66.088 
44,718 
23,530 
71.646 
89.565 
794,120 
51.303 
5673 
12261 
12301 
12341 
1 
> 1 © 
i 
! 
i 
1 
i 
4 | ON 
1 
1 
i 
i 
| 
M 
i 
i 
i 
I 
1 
<4 1 ™ 
hI © 
np | «= 
e | * 
DEN 
N I © 
I 
| 
D | wi 
-= 1 © 
- | iO 
9.1 > 
h dtf 
~ | © 
d 1 + 
? | e» 
i 
1 
i 
D | I~ 
29 1 (0 
N | © 
e] e 
0 1! wp 
o pur 
> ID 
np 1 mn 
KA 
! 
I 
| 
! 
! 
| 
i 
1 
| 
i 
i 
I 
| 
! 
I 
  
   
     
to leave the cadastral (EN) coordinates 
and to go onto canonic (XY) coordinates, 
referred to the axes of the mean ellipses. 
The height over the ground remains as the 
third  Z coordinate. A dedicated computa- 
tion program easily performs this tran- 
sformation, as the 5 parameters of the el- 
lipses are known; and gives the new XY 
coordinates in the format needed for the 
block adjustment with bundles. 
2.3 - For the chaining observations we u- 
sed an analytical Kern DSR 11/H plotter. 
No correction for systematic errors was 
introduced. The phocal length (Wild P31 
camera) is 99.66 cm; the image size 12 x 
86 cm. 
The adjustment was performed with the 
excellent program  PATB-PC by  Ackermann- 
Klein 119881, with  autocalibration and 
automatic gross error detection. For the 
El and E2 block computations, 25 resp. 14 
iterations were effected. The result was 
superior to any expectation, as it appears 
from the here below schedule 2. 
The Annex 2 reports the results  obtai- 
ned for the control points. We must point 
out their exceptional quality, which shows 
the perfection of all the terrain and 
plant operations (fundamental net, its 
densification, intersections on the con- 
trols, instrumental observations,  adju- 
stment computations). The final accuracy 
of the controls assures a centimetric  ac- 
curacy in the plotting. 
3. - The plotting 
3.1. -. The above said canonic (XY)  coor- 
dinates cannot be used for the plotting, 
except for the pairs which correspond to 
the vertices MN of the mean ellipse (fig. 
3). In fact, we need that every- 
where the instrumental Y axis be normal to 
the ellipse, so that the Y coordinate of a 
generic point P permits to deduce its  di- 
stance to the mean ellipse, i.e. its alti- 
Schedule 2 
  
Sigma naught 
Controls 
Mean resid. on the controls 
  
Block Image Terrain Horiz. Vert. Horiz. Vert. 
(microns) (m) (nr) (nr) (m) (m) 
El 5.88 0.001 71 71 0.003 0.003 
E2 6.71 0.001 58 58 0.004 0.003 
titude q in the Coliseum reference (shq). (X'Y') coordinates are only transition 
Therefore we must give a rotation 0 to the 
canonic coordinates of each pair, before 
plotting it; we obtain thus the "normal" 
coordinates (X'Y'). 
fig. 3 
We can assume a mean 0 between the na- 
diral points of the two photos of "the 
pair. This is not quite rigorous, as we 
should assume a different 0 for each point 
P; but, as we shall see later, the normal 
coordinates to arrive to the Coliseum 
coordinates, and a little variation of © 
has no influence on the final result. In 
fact, the purpose of the transition (XY) 
-» (X'Y') is only to obtain that the Y in- 
strumental mouvement be  quasi-normal to 
the monument's surface in the whole pair. 
A dedicated program  TRASFHl computes 
the 6 rotation for the central point of 
the pair, and effects the transformation 
from the canonic onto the normal coordina- 
tes. The normal coordinates thus obtained 
for the control points are used for the 
absolute orientation of the pair; its who- 
le plotting results therefore expressed 
in its particular normal system. The ob- 
servation is done in the usual way, and 
does not require special modalities. 
3.2 - The last step is to transform the 
normal coordinates into Coliseum coordina-