CIPA 2003 XIX"‘ International Symposium, 30 September-04 October, 2003, Antalya, Turkey 
273 
appropriate positions and therefore some images are very 
oblique. 
This is the case of the upper part of the central façade, 
which is very high - no hydraulic lifting device for the 
cameras was available. 
5 PROCESSING WITH PHOTOMODELER 
The two cameras were calibrated according to the 
instructions of the PhotoModeler user manual. 
In the course of processing very oblique images for the 
purpose of the absolute orientation of models, we had to 
make use of additional auxiliary points (see 3.8). 
For the assembling of the five orthophotos to a mosaic we 
employed the software ALDUS PHOTOSTYLER 2.0. 
This orthophotomosaic served for the plot in AUTOCAD, 
(see Appendix) 
6 PROCESSING WITH DIGITAL VIDEO 
PLOTTER (DVP) 
At the present moment, only a rectified image of one 
façade, produced by DVP-software, is finished. 
Orthophoto production is still in progress. 
7 CONCLUSIONS 
For small plane objects (façades, walls, etc) a simplified 
ground control - using tape and level only - is sufficient 
for the orthophoto generation. In case of large objects, 
however, the ground control has to include topographic 
measurements i.e. the employment of theodolites or total 
stations is a must. 
The PhotoModeler -Software showed to be very useful 
for the generation of orthophotos as a base for the plot, i 
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ACKNOWLEDGEMENTS 
We gratefully acknowledge the kind cooperation of 
Messrs. LEICA GEOSYSTEMS LTDA, Sao Carlos /SP 
and GEO-SWISS LTDA, Rio de Janeiro, which placed at 
our disposal the software DVP with Orthophoto Module 
and the Total Station LEICA TCR 307. 
Captain Justino Francisco Pires de Oliveira, of 
Departamento de Engenharia de Fortificaçào e 
Construçào, (IME) - for plotting the main façade in 
AUTOCAD. 
APPENDIX 
1 - Distribution of Targets and Auxiliary Points. 
2 - Orthophotomosaic. 
3 - Plot of the Main Façade.