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Biirger, Thomas
Images where taken with photogrammetric equipement (ROLLEI-3003 METRIC) as well as a medium resolution digital
camera (KODAK DCS 420 B/W). Image series contain between 40 and 200 Images. Space assignement plans of the plant
are digitized and loaded into the system to facilitate orientation of the images and to compare finally the as-built status of
the plant with its design status presented by the plan by means of superimposition.
Pre-orientation of images is performed in ABANICO using resection, DLT, intersection of tiepoints and the straight-line
orientation method shown above. Tachymetric data can be imported and assigned to individual imagesets. Pre-orientation
data will be exported either to ROLLEI MR2 or to the bundle adjustment program CUBA from City University in London.
Final data of inner and exterior orientations are imported from the two systems into ABANICO.
virtual walking and grabbing of exterior image orientations is possible within the shaded model (Fig. 7) The reconstructed
as-built model as well as the plant’s catalog-data are stored in a relational database which permits access to individual
parts of the plant. Until today the export of model-data has been realized for AUTOCAD and VRML-1.
5 CONCLUSION
Close-range photogrammetry is a powerfull tool for as-built-documentation of chemical and process plants. The oriented
images itself are documentation and an important supplement to the virtual model.
The success of the close-range photogrammetry in this area will depend on the degree of adaptation to the plant-engineers
necessities. Quick and reliable tools for reconstruction are more important than a high accuracy as needed in other
domains of photogrammetry. The result of as-built modelling must be compatible to results of other CAD-tools used by
plant-engineers. Therefor a maximum of data about the plant should be integrated in the measurement and modelling
process and even in the orientation phase of an image series.
In future as-built documentation would be more frequently the update of virtual electronic models than an initial modelling
of old paper-planned process plants. Further steps might go toward a higher degree of automation, which could be realized
as a comparison between the design state and image-features found in oriented images of the realized plant.
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