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THE AUTOMATIC SELECTION SYSTEM OF TRANSMISSION LINE ROUTES BASED ON DTM 
Mamoru TAKAHASHI, Takashi YOKOKAWA 
Chief Engineers, Kokusai-Kogyo Co., Ltd. 
Japan, ISPRS-IV 
Key Words: DTM, Transmission, Automatic Selection System 
Abstract: 
The ultra high voltage nuclear plants are constructed at remote area for the electric power develop- 
ment. The transmission line routes shall be extended through mountainous regions. Detailed study con- 
cerning new transmission line routes to be constructed in a wide area shall require tremendous 
amount of manpower. 
We, therefore, developed a Computer-Aided Transmission Line Route Selection System to conduct a rapid 
investigation on leading and economical routes. The system is based on DTM and topographic information. 
This report shall inform you of the summarized results of the Route Selection System to be originated in 
Japan. 
based on the standards of transmission line is per- 
formed for the points and spans where the steel 
towers can be constructed, the combinations of which 
allow us to select the most economic routes. 
Figure 1 represents the general flowchart of 
this system. The data are the information groups of 
the points, lines and planes transcribed on topo- 
graphic maps from aerial photographs, other geo- 
graphic maps and other data that were measured by 
analytical plotter "PLANICOMP C-100" and digitizer. 
These data are compiled into the grid information 
In this system we have therefore been preparing, that can be easily processed by computer when simu- 
as data base in the form of grids or polygons, the lated. The output we obtain in this system are route 
geographical space information considered to be maps, longitudinal profiles, route ledgers that 
necessary for the selection of routes in all the permit us to confirm the details of the routes as 
areas in order to evaluate the conditions of loca- selected in a same way as the conventional route se- 
tion. Further a computer-aided model simulation lection. 
1. OUTLINE OF ROUTE SELECTION SYSTEM 
The transmission line route is to be so selected 
that its cost should be minimum in general consid- 
eration of the natural and social environments as 
well as its construction and maintenance. The re- 
strictions on society to be taken into account in 
the selection include such technical ones as geo- 
graphical features of the site, the steel towers 
which bear the line and surrounding conditions of 
location. 
« AUTOMATIC SELECTION SYSTEM OF TRANSMISSION LINE ROUTE » 
Setting the Range of the Subject Area Obtaining the Design Data for SteelTower, 
Determining the Start/TerminalPoints Electric Wire by Their Types 
Investigated Data Information 
and Information from Maps 
  
  
    
     
  
         
  
   
   
  
  
   
  
Information from 
AerialPhotographs 
  
  
  
  
  
  
  
  
  
  
  
  
Receiving Receiving Preparation 
of Line of Area of Digital 
Information Information Terrain Model 
V 
  
(Line Data and Polygon Data) 
Scenic Resorts and Places of Preservation (1) Transmission Parameter 
*Transportation Method (2) Design and Construction 
*Crumbling Land and Faults under Imposed Social Restriction 
*Towns/Villages 7 
*Boundary of Administrative Area 
*Roads and Railroads 
National Parks and Protection Area of Environment 
*Tree Kind and Height 
Basic Relief Line such as Ridge and Valley Lines 
i 
Conversion of Polygon 
Line Data into Grid Data 
  
   
  
  
   
    
  
Fractionation of 
Digital TerrainModel Conditions for Steel Tower 
Referential Control Data 
  
  
      
  
  
  
Preparation of Grid 
Information Data (Evaluation of Location Conditions Topographic Division 
for Steel Tower) Code Adopted 
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| ES of Location 
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Classification of Geographic Pattern Topos of Maximum Gradient 
  
  
  
  
  
  
NCP Setting i | 
Transportation Means | 
Tree Kind and Height | Preparation of Digital 
List of | These 
| Terrain Information Data 
Calculation Design Data 
Results Route Selection Simulation 
En = i Simulation 
Route Ledgers Control Data 
Application Software E 
N 
Outline of the 
N 
Route Maps 
  
  
  
  
  
  
  
  
  
   
      
  
PCP Setting 
  
  
Longitudinal 
Profiles 
Ground where 
N 
Bird's Eye 
View 
the Line Passes 
Figure 1 Flowchart of Route Selection Simulation 
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