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floating in the object space. This paper introduces one kind of
its utilization for reconstructing models from different source
data. Plan parameters are fit from topographic maps and height
parameters are fit from LiDAR data and DEM. Aerial Photos
are also used for examining and modifying. According to our
case study of Taipei City, the procedure goes smoother and
faster with the increase of operating experiences. Here are some
characteristics of the proposed approach:
1. For most of the normal buildings, floating model does
increase efficiency than point-by-point measurement.
2. The labour-consuming precise measurement is carried out
by computer while the operator only needs to select
model and approximately fit it.
3. The inner constraints guarantees the geometric nature
unchanged after reconstructing.
4. It is possible to reconstruct the whole building even if a
part of it is occluded.
Brenner, C., 2000. Towards Fully Automatic Generation of
City Models. In: The International Archives of the
Photogrammetry, Remote Sensing and Spatial Information
Sciences, Amsterdam, the Netherlands, Vol. XXXIII, Part B3,
pp. 85-92.
Das, S., Bhanu, B. and Ho, C.-C., 1997. Generic Object
Recognition Using CAD-Based Multiple Representations, in:
IEEE CAD-Based Vision Workshop, pp. 202-209.
Englert, R. and Gülch, E., 1996. One-eye Stereo System for the
Acquisition of Complex 3D Building Descriptions. GIS, No. 4,
PP- 1-11-
Ermes, P., 2000. Constraints in CAD Models for Reverse
Engineering Using Photogrammetry. In: The International
Archives of the Photogrammetry, Remote Sensing and Spatial
Information Sciences, Amsterdam, the Netherlands, Vol.
XXXIII, Part B5/1, pp. 215-221.
However, we also find some shortcomings of the model-based
approach:
1. A building could never be reconstructed correctly if there
is no adequate primitive model.
2. The decomposition of building needs practice and
experience.
3. It is difficult to implement the subtraction operation
between two models.
4. For those very complicated buildings, model-based
approach will cost more time than data-based approach.
Therefore, we suggest two further research objectives: (1) de
signing more primitive models such as curvy plane. (2) analyz
ing the topology and implement the Boolean operator among
3D models.
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