6.2. Digital Orthophoto 
The following data were used in forming digital 
orthophotos of main and side facade: 
- Camera WILD : P-32 
- Gauged focal distance: 63.95 mm 
- Object distance: 19 m 
- Bases length: 3 m 
- Photo scale: 1:300 
- Orthophoto scale: 1:50 
- Longitudinal covering: 87 % 
The orthophotos were produced at the Digital 
Photogrametric station Leica - Helava - DPW 770, 
which belongs to the ESTEIO Engineering and 
Airdrafting S.A. from Curitiba-PR. 
Several technical aspects had their role in the 
process , as follows : the SOCET SET was the 
logical module used , for its orienting the models , 
molding the ground automatically , manual and 
automatic mosaic of photos , gathering vectorial 
data and so forth . First the color negatives were 
scanned with the station DSW 100 (Leica-Helava) 
and 2000 dpi which correspond to 13 microns 
pixel. Each negative generated a magnetic file in 
positive of around 100 megabytes ;this was adapted 
expecting a possible restitution at the very station . 
For execution there should be a choice of DTM 
for the PLANICOMP C-120 . Due to great differ- 
ences in depth (z) of details , it was decided to use 
DTM since the restituted structural lines , which 
were placed to form a grid every 50 cm regularly . 
Correction is automatic in software with field sup- 
port points and DTM . No discrepancies there . 
Due to some image distortions it was necessary to 
edit part of DTM and to compare it with the elabo- 
rated restitution . Working time - considering the 
tests made and the pioneer aspect - was of about 50 
(fifty) hours . Due to great differences in depth , 
the details at the back could not be corrected . As a 
final product , it was generated a digital ortho- 
photo in magnetic file TIF with a 600 dpi resolu- 
tion ( was shown at the stand of IME at the Bra- 
zilian Cartography Congress). 
As for restitution also a convention board was 
elaborated . This product was sent to the United 
States to be made in a Laser photoplotter with 
2000 dpi resolution . 
7. CONCLUSIONS 
7.1 - The final products , namely the photogram- 
metric restitution of two fagades and its colored 
orthophotos , have fundamental roles in the resto- 
ration process . 
7.2 - Detail definition was somewhat damaged by 
the use of colored negatives . The absence of spe- 
cialized laboratories to develop this type of film is 
a great obstacle . 
7.3 - An interesting technical aspect was the moti- 
vation aroused in many professionals of photo- 
grammetry who were willing to cooperate . 
7.4 - Digital orthophoto is a quite modern tech- 
nique though not yet fully popular in Brazil , spe- 
cially the color aspect . We believe this was a pio- 
neer achievement in our country . 
7.5 - The final products was displayed at the stand 
of the Military Institute of Engineering at the XV 
EXPOSICARTA of the XVII Brazilian Congress 
of Cartography . 
7.6 - This work means one more cartographic con- 
tribution to form the Photogrammetric Archives of 
Brazil's Historical Monuments . 
8. ACKNOWLEDGEMENTS 
Antonio Pimentel Wins - President of Instituto 
Histórico e Geográfico do Rio de Janeiro. 
Carlos A. Etchevarne e Ana Maria Gantois - Museu 
de Arqueologia da UFBA. 
Ciro Lira - Coordinator of Instituto do Património 
Histórico e Artístico Nacional - Rio. 
Cristina Xavier Ferreira - Architect ,Companhia de 
Desenvolvimento da Regido Metropolitana de Sal- 
vador - CONDER. 
Edivaldo Machado Boaventura - Universidade Fed- 
eral da Bahia. 
General Agenor Homem de Carvalho - Cmt of VI 
Regido Militar. 
General Luiz Augusto Cavalcante Moniz de Aragäo 
- Cmt of Instituto Militar de Engenharia - IME. 
Gilka Goulart Santana - Restorer Architect. 
Joaquim Alves da Cruz Rios - Director of Jornal A 
Tarde - Salvador-Bahia. 
350 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996 
  
  
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