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The 3rd ISPRS Workshop on Dynamic and Multi-Dimensional GIS & the 10th Annual Conference of CPGIS on Geoinformatics
Chen, Jun

ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS”, Bangkok, May 23-25, 2001
Figure 4 The virtual landscape of one interchange
modifying, moving, attribute editing, boundary triangular
clipping, etc.
Highway road design and bridge design are both in AutoCAD
R14. There are three kinds of model in AutoCAD R14, which
are frame model, surface model and entity model. The shape of
subgrade is irregular. It is suitable and reasonable to adopt
triangulation to represent the surface of the subgrade. Road
and bridge surface model are formed with the object of 3D
An interchange is consisted of by multi-camp. The junction
modeling can be constructed by merging 3D surface vertex,
splitting 3D surface.
Figure 2 subgrade modeling
Figure 3 merged model
A project contains many kinds of model that is independency
each other. Each kind of model may have multi-model. Those
models may be terrain model, subgrade model, etc. It is
important for the project to manage the model, so that
embedding, intersecting, merging process among the models is
carried out efficiently.
The integration model can be constructed quickly by using local
updating and optimizing algorithm (Figure 3). With maintaining
the topo-relation, its operability is the same as the original
model. For the special case, the bridge model is inserted as an
entity. In the new model, the profile and stream line can be
calculated, the value of the height can be interpolated. The new
model can even be overlapped with the other model to form
another new model.
3 Landscape of design
The virtual landscape technology is one of high-tech scopes of
combining graph and image technology to human perceive
theory. It produced a visual sense by using computer, including
perceptive environment of hearing, touching and smelling. The
highway designer has earnestly long for the virtual landscape
of the project produced by integrating geographic spatial data
with integration model of design.
Highway virtual landscape real-time roaming system bases on
digital image, digital terrain model and highway design model. It
is vivid, stereo and alternate system. By pasting material,
texture or surface image, and arranging scene, the virtual
landscape of the design road is formed, and dynamic scene
can be viewed(Figure 4). The attribute of highway design can
be also inquired by multimedia. It provides an intuitionistic,
stereo and dynamic impression to designer. The quality of
design and the relationship between design and environment
protecting all can be evaluated.