Figure 5.2: Conversion from ESRI PolygonZ shape file to CityGML data model
2. Conversion from ESRI PolygonZ Shape file to CityGML
data model which is the main conversion task of the thesis
work. Also the convertion is divided into three parts which
are called bookmark in FME (Fig.5.2),
a. Building bookmark which includes general
information about buildings and necessary attributes
in order to have correct CityGML dataset.
b. Boundry Surface bookmark which includes the
buildings surface informations, necessary attributes as
well as extra attribute such as roof height.
c. Building Installations bookmark which includes the
building installation necessary attributes in order to
open properly in the CityGML data model.
Each Transformer needs necessary input data and should be in
the right position in the FME workbench. Finally, the
conversion has reached the destination data as CityGML, which
is XML based format.
6. CONCLUSION
To sum up, the gap between photogrammetric methods and
CityGML has been filled with a FME Workbench. Furthermore,
the building model of photogrammetric methods has been
created and also the building model of CityGML is minimized
from the specification document depending on the requirements
of the thesis work.. Also those building data models are
compared with CityGML building model. The differences and
similarities of those models have also defined and also they
mapped eachother with using UML diagram.
7. REFERENCES
Kolbe, T. H., Gróger, G., Plümer, L. (2005), CityGML -
Interoperable Access to 3D City Models. Proceedings of the
first International Symposium on Geo-Information for Disaster
Management, Springer Verlag.
Zlatanova, S., Paintsil, J. and Tempfli, K., 1998: 3D object
reconstruction from aerial stereo images. In: WSCG '98, 6th
international conference in Central Europe on computer
graphics and visualization: February 9-13, 1998, Plzen-Bory,
Czech Republic
Gróger, G., Kolbe, T.H., Czerwinski, A., Nagel, C., 2008.
OpenGIS City Geography Markup Language (CityGML)
Encoding Standard, Version 1.0.0, OGC Doc. No. 08-007rl,
Open Geospatial Consortium
Kolbe, T.H, 2009, Representing and Exchanging 3D City
Models with CityGML, 3D Geo-Information Sciences, ISBN:
978-3-540-87395-2, pp. 15-31
John Vincent Carlis, Joseph D. Maguire ,2001. Mastering
Data Modeling: A User-driven Approach.
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