3D models gallery
Defft University
of Technology, The Netherlands
Enschede, The Netherlands
Vienna,
Austria
Rozenburg, The Netherlands
Deft
The models are reconstructed
(using PhotoModeller and SoftPlotter)
at the Section of Optical and Laser
Remote Sensing (OLRS) (where I was working in the period 2000-2003) as a
part of the UbiCom
project. The goal of this data set was to provide building facades with a very high
accuracy (few cm.). The facades, together with the other façade features
represented by lines were used for correcting the position of person wearing AR
equipment. The data set is imported in the SDO_Geometry
model of Oracle Spatial 10g in two variants using data types
mupltipolygon and polygon.
|
|
|
|
|
|
|
|
|
|
The 3D models are created with
the help of ITC MSc students applying a semi-automatic
procedure for data extraction and 3D topology building from aerial images (see Chapter 7, thesis). The procedure consists of
two steps: 1) manual digitising of roof outlines in a
digital photogrammetric station and 2) automatic computation of footprints and
consequent construction of walls. The data are organised
in two types of 3D topological data structure (3D FDS and SSS). The Enschede data set is imported in the geometry models of Oracle
Spatial and PostGIS. The ITC building (1, 2) is
re-constructed from architectural plans. Snapshot 12 represents an idea for LOD
created on the fly.
|
|
|
|
|
|
9. |
10. |
11. |
12. |
The 3D model is created from existing data set containing roof polygons (i.e. roof outlines photogrammetrically measured) and a height point on the ground. The buildings are extended to the ground point (i.e. all the vertices of the footprint have the same z value). The data set contains about 21000 buildings and was used for performance tests. The model is available in the two 3D topological data structure (3D FDS and SSS). Since recently, constrained TIN from the footprint polygons is created. The buildings and the TIN are also imported in the Geometry models of Oracle Spatial and PostGIS. The data set is used to test the new data type Solid of Oracle Spatial 11g. Snapshots 5 to 8 represent an idea of creating LOD on the fly using MNMAX bounding boxes of the buildings.
|
1. |
2. |
3. |
4. |
|
5. |
6. |
7. |
8. |
The 3D data set is created from aerial photographs, i.e. automatic creation of DTM, measuring roof outlines and projecting them onto the DTM. Footprints of threes were measured as well. The data set was used to test performance of different representation of threes. Snapshot 3 represents visualisation with billboards and snapshot 4 modelling with parametric shapes (cylinders and spheres).
|
1. |
2.
|
3. |
4.
|
