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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
Jiaqing ZHENG, Xi’an ZHAO, Chujiang CHEN
China Communications Second Highway Survey, Design and Research Institute
Yingwu Ave.498,Wuhan,Hubei,P. R. China
Keyword: Integration, Photogrammetry and Remote Sensing, Highway CAD, DTM, Virtual Landscape
There is plenty of information in the image by Photogrammety and Remote Sensing.. Highway CAD has cried for the support of the terrain
data and visualization of the design results. The terrain model is formed by constrained delauary TIN(CDT), which considering terrain
feature and integer modeling. The gross data in the original data can be found and deleted in real time. Highway road design and bridge
design are both in AutoCAD, and their model are formed with the object of 3D surface. With overlapping the road and bridge model on the
terrain model, pasting material, texture or surface image, and arranging scene, the virtual landscape of the design road is formed, and
dynamic scene can be viewed. The integrative technology of Photogrammetry and Remote Sensing and highway CAD has been formed
by data collection, indoor data processing and highway design with high-technology. The automatization, visualization and integration
highway survey and design has been achieved.
1 Introduction
environment protection factually. Highway CAD has cried for
the support of the visualization of the design results
Highway design usually based on 2D terrain maps which are
produced by photogrammetry. However, a lots of information,
such as image of the terrain, 3D topographic data etc., has not
been used fully. It is impossible to design route on mass
geographic data, because some key-technology, like the
management, modeling of mass data, are not in practical.
Modeling of large mounts of data is the jam between obtained
terrain data and highway design.
As the rapid development in computer and algorithm, it is
possible for microcomputer to process and analysis mass
information. Image is intuitionistic, visual. Highway design
linking together image can evaluate the design quality and
2 Modeling
The terrain model is formed by constrained delauary TIN(CDT),
which considering terrain feature and integer modeling. The
mileage of highway project is long, and there is mass
geographic data in route plan corridor. It is best to adopt point
insert algorithm requiring less memory to form CDT. Many
measures, including efficient index mechanism, rapidly search
algorithm, optimizing algorithm etc., all are in consideration.
The formed model is less time consumption, high efficiency, top
quality, net unique (Figure 1).
Figure 1 constrained delauney TIN(part in one project)
The software of modeling is developed by using Visual C++
and AutoCAD R14 ObjectARX. It receives AutoCAD R14
entities directly and other format, like NTDFS-DEM, ASCII etc.
Code mapping table is used, so as to fit different attribute
coding by different data collector. User can determined which
element of the terrain to join the CDT construction.
The construct CDT speed is constant. It has reached 15000
valid points per second.
There are many important functions in the software. They are
model gross snooping, real-time point/line adding, deleting,