EuroSDR Projects - Host Ireland

The analysis of the structural quality of the reconstructed buildings was not performed in the project at
this stage. Even though, it is an important aspect for the end user how well do the reconstructed
structures reflect real life structures.
2 Materials
2.1 Test Sites and Delivered Data
2.1.1 General
The project consisted of three sites provided by the Finnish Geodetic Institute (FGI), namely Senaatti,
Hermanni and Espoonlahti and one site, Amiens, provided by the Institut Geographique National
(IGN).
For each test site the following data were available and could be downloaded from the FGI ftp-site:
- aerial images
- camera calibration and image orientation information
- ground control point coordinates and jpg-images of point locations (with the exception of
Amiens)
- laser scanner data
- cadastral map vectors of selected buildings (vector ground plans)
- Espoonlahti: 11 buildings (white vectors in Figure 2-6)
- Hermanni: 9 buildings (white vectors in Figure 2-4)
- Senaatti: 6 buildings/blocks (white vectors in Figure 2-2)
- Amiens: 7 buildings
Participants were requested to create the vectors of the 3D city models from the given areas in all of
the four test sites using the materials described above. Participants could use any methods and data
combinations they wished. The 3D-model should consist of permanent structures of the test area:
buildings modelled in as much detail as possible (this mainly concerns roof structures) and terrain so
that it would be possible to measure building heights using the model. In addition the participants
were requested to describe the process used and economical aspects, time spent for the process etc.
Reporting instructions were given after the data was delivered.
2.1.2 FGI Test Sites Espoonlahti, Hermanni and Senaatti
Each of the test sites had their own characteristics:
- Espoonlahti: with a significant variety of houses, undulating terrain and a large number of
trees, Espoonlahti is located in Espoo, about 15 km west of Helsinki with high-rise buildings
and terraced houses.
- Hermanni: a large, simple block of flat houses with low vegetation, Hermanni is a residential
area about 3 km from the main city centre with four to six storey houses built mainly in the
1950’s.
- Senaatti: a typical European city centre with some complex buildings and no vegetation,
Senaatti includes the area around the Senate Square in Helsinki main city centre, three to six
storey houses and Lutheran Cathedral built mainly in the 19 th century.
In addition to the construction type, that differs from site to site, the test sites have also been flown
with different laser scanners (TopEye, TopoSys-I, TopoSys-Falcon) and with different pulse densities
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