O 25 , shape
daylight . It
olution , thus
o the tabula-
r construction
luction , such
, shape 120,
ectronic light
1/10 to 1/100
| granulation ,
. Also offers
ges including
yr architecture
ensitivity ISO
a fine grain ,
ul resolution .
yy of tabular
t. This makes
structions with
argements and
was combined
ıragm opening
0 photos were
id white of the
ECISION
destroyed sign
lilding was es-
s in length ,
ic equipment
servation were
circle , giving
96
OUTLINE POLYGONAL
E TECHNICAL SPECIFICATIONS RESULTS
LINEAL TOLERANCE T = 01 JE 4.7 cm
EAL CLOSURE |
The technical specification values referring to
precisions are included in the service Bulletin
1602- Resolution Presidency of the Republic n. 22
of July 21% , 1983, of the Brazilian Institute of
Geography and Statistics Foundation. So, in our
case, n = number of vortex equals six, fx =
axis closure at the x and fy = axis closure at the y.
Value L represent, in the form above, the total
length of the polygonal.
The altimetry of main polygonal was done through
geometric leveling and also the counter leveling
was done.
5.2. Topographic bases
Once the polygonal settled and measured, there
followed a phase of determining the photographic
bases which were obtained by double irradiating.
Six bases were established on ground , four of
which were at main facade and two at side fagade.
5.3. Support points
The coordinates for the photogrammetric support
points were determined from the bases and mate-
rialized through previously settled targets at
points on the façades on the building. All points
were obtained by using intersection process from
fore, two series of observation (right and left cir-
cle), totaling thirty eight support points. The
height of the targets was obtained by trigonometric
leveling.
For azimuth control of the construction was used
the sun azimuth oriented toward the Garcia
d'Avila light house , which belongs to the Ministry
of Navy and has well known coordinates.
All data were stored in field notebooks and com-
puter diskette for further possible needs
(calculations, conferences, etc...)
349
6. OFFICE WORK
6.1. Photogrammetric restitution
These works were elaborated in the analytical
system airtriangulator- restitutor first class
PLANICOMP C-120 it was processed as thor-
oughly as possible, displaying all details and pos-
sible representation in a scale 1:50. No discrep-
ancy was found in the field support ; there even
over abundance of points and the precision was
excellent . As to the main facade , the final rem-
nants of the absolute orientation showed an aver-
age result of x = 5 u ; y = 6 u and z = 8 u ; for the
side façade x = 8 nu ; y = 14 u and z=20p which are
perfectly compatible which the final scale . Work-
ing time was eighty five hours of restitution and
eighteen hours of editing for both façades . Plus,
for the main façade the borders of the model were
not used, but a third one instead, the photos be-
ing taken from another base of the ground.
Editing took place on a specific software CAD
TEMAP of the enterprise ESTEIO Engineering and
Airdrafting S.A.
Final product is presented in magnetic file DXF. À
conventional form was established for items such
as hole, stone, plaster, cleft, etc.
Also a frame was elaborated in the software
AUTOCAD to display organizations engaged,
project data, conventions, etc. The negatives pre-
sented greater difficulty in color - restitution of
details in general - than in black and white.
The above mentioned frame will allow a final
presentation of the work at the stand of IME
(Military Engineering Institute) at the XVII Bra-
zilian Congress of Cartography.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996
