6. DTM information plane 
On this IP, the designer can check the 
topographic conditions in the route corridor and 
determine where tunnel should be built to pass through 
the mountain; where bridge should be built to across 
the deep crayon. 
7. 3D-perspection information plane. 
On this IP, the designer can check the correction 
of the bridge and tunnel sites and drainage system. 
A mathematical reference system should provide the 
linkage between individual layers. 
The conceptual framework of GIS for railway 
design is shown in fig. 2. 
RAILWAY DESIGN 
This GIS system provide the basic data for 
railway design. In reconnaissance and feasibility 
stage, The design steps is follows; 
1. The designer collects all kind of data from 
diffirent sources to establish the engineering 
database. 
2. determine the political, social, topographic 
Control factors. The meaning is that the railway line 
has to pass these control points. 
3. The designer could interpret the engineering 
feature on the three- band colour composition imges 
directly from the screen, finding out the factors of 
influencing the railway line location on the ground, 
such as the naturàl environmental, geologcal and 
hydrological condition; the main rivers and road 
Systems; the catchment areas of the main rivers, the 
building material sources. The designer selects all 
possible railway line between the start point and the 
end point in the topographic information plane on the 
Screen. 
4. The designer evaluate all feasible line, 
calculate the amount of earthwork, the length of 
tunnels and bridges. The final optimum railway line 
will get from the shortest distance , lowest construction 
cost and vehicle operating cost. 
9. Checking the correction of the bridge and 
tunnel sites, drainage structure on the 3D — perspect 
information plane. 
738 
6. The designer put the selected railway line on 
the topographic information plane and output the 
design documents and maps. 
CONCLUSION 
This paper exploits the integration of remote 
sensing data with GIS data, their effective utilization 
in the railway design. The following can be concluded 
in this study. 
1. The system has demonstrated that it is 
technically feasible to solve the engineering practical 
problem. Designer can directly choose the best railway 
line on the screen in preventing wasteful repetition of 
survey effort. 
2. Determining the railway line on the 
topogrophic informastion plane can keep the accuracy 
of the railway design. 
3. Using Landsat image data updating the GIS 
data to keep the reliable engineering data base. 
The whole system is so far in the testing status. 
REFRENCES 
Beaumont, T. E. et al. , 1988. GIST. A Geographic 
information system Toolkit for water Resource and 
Engineering applications, ISPRS Kyoto 1988 B4 
pp497 — 506. 
Guaraci Erthal, 1988. A General Data Model for 
Geographic Information Systems , ISPRS Kyoto 
1988 B4 pp529—537. 
Mathias J.P.M. Lemmens, 1988. Automatically 
GIS updating from classified satellite Images Using 
GIS knowledge. ISPRS Kyoto 1988 B4 pp198 — 
206. 
Terrence Keating, William Phillips, and Kevin 
Ingvam, 1987. An Integrated Topologic Database 
Design for Geographic Information Systems, 
Photogrammetric Engineering and Remote Semsing, 
Vol. 53 No. 10, pp1399— 1402. 
T. Oshima, 1988. Automatic Road Selection from 
LANDSAT Data, ISPRS Kyoto 1988 B7 pp423 — 
432. 
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