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Exporting 3D Geoinforamtion from Baggis Database to CityGML
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geodesy and Satellite Positioning.
2009 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The objective of this research was to investigate how to export 3D data from an

existing database, Baggis. The data was to be exported in CityGML format, a

relatively new format used to represent 3-dimensional city models. The study area

was the region of Stockholm, but the objective was to write a general plugin that

would work for any area in the database.

Digpro AB has developed a Java application called DP/Spatial, which is where

the plugin was implemented. The plugin, also written in Java, is run from the

client side and the server returns a compressed CityGML file which contains all the

buildings and other features in the area.

As the database contained several types of geometries, they were all evaluated to

determine whether they should be included or not. The geometry types that were

included all have a corresponding class in CityGML. The data was stored in an Oracle

Spatial database containing geometries in LoD2, Level-of-Detail 2. The database

includes basic building geometries and a terrain model consisting of triangles. All

building entities also contain address information, fetched from a database different

from the Oracle Spatial database where the building geometries are stored. The

plugin fetches the geometries from the database, sorts the geometries and generates

the corresponding CityGML. The results are then zipped and sent to the client.

A custom CityGML viewer was also developed by using Direct3D and C#. To

evaluate the exported data, three different CityGML viewers were used, LandXplorer,

Aristoteles and the custom, more basic CityGML viewer written especially

for this research.

The results of the research are a fully functional plugin for Digpro’s software

DP/Spatial and a basic but functional CityGML viewer. The conclusion of the

research is that the plugin was well implemented in the system, the exports work

flawlessly and the CityGML files can be opened in the two available CityGML

viewers. The custom CityGML viewer provides basic usability, more than enough

to validate the exported data.

Place, publisher, year, edition, pages
2009.
Series
TRITA-GIT EX ; 09-05
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-199674OAI: oai:DiVA.org:kth-199674DiVA, id: diva2:1064879
Supervisors
Available from: 2017-01-19 Created: 2017-01-13 Last updated: 2017-01-19Bibliographically approved

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