6000 
(3969 
8875 
  
  
k of base 
mensional 
ed which 
al angle to 
. Figure 2 
te with the 
esults are 
J of the 
ted out all 
,e Plate 
  
  
E 
f Base Plate 
The measurement accuracy of the total station is 
+1mm which is an enough accuracy relative to an 
allowable accuracy of the base placed position which is 
less than £2mm. 
However, because of a plural bases having the same 
shape being measured, there is a great possibility of an 
error occurring, for example, the same base is measured 
twice or a base not measured yet exists. 
Also, since a discrepancy is estimated by comparing the 
measured value with the design value after end of the 
measurement, occurrence of error in measurement 
cannot be grasped immediately. Further, because of a 
document compiling work being dome by hand, it takes 
much time and labor and an error in entry is prone to 
come about. Therefore, it has been decided to build up a 
system capable of comparing the measured value of the 
base position with the design value during measurement 
with the reading of the base design value and preparing 
of document automated. 
3. Built-up System 
3.1 System Configuration 
Figure 3 shows the system configuration. The system 
substantially comprises; personal computer, and printer 
installed in the office and further, total station and 
controller used at the site. Consideration has been given 
so as to enable reading the design value and outputting 
the data of document through the personal computer in 
the office, but not increasing the machines and materials 
used in the field work. 
For transmitting the design value and measurement data 
between the personal computer in the office and the total 
station at the site, the controller of total station is used 
and the data are sent and received through a serial 
interface. 
3.2 Automatic Reading of Design Value 
The types of figures drawn in the plan are classified into 
a square, straight line and letters and among them, the 
straight line has such an attribute as a solid line or a 
dimensional line. In the plan, the base plate is drawn by 
a square and the design value, as a letter. A figure 
linking both is a dimensional line. It has been thought 
that by making full use of the linking relation of this figure, 
the design value can be read by extraction the base 
plate. Figure 4 shows an extraction flow of the base plate. 
First, in order to extract the base plate, the squares are 
taken out of the plan, from which the following are 
excluded : a square adjoining to 4 corners of the plan 
( column of entry of DWG. No. and designation of 
  
  
  
Computer 
  
  
  
  
  
Design 
Controller 
   
  
  
  
Value 
  
  
   
    
     
   
  
  
    
  
  
  
  
  
  
  
E 
  
  
  
  
  
CAD Document Med 
Date Data ata 
Printer 
  
m 
  
   
  
Total 
Station 
  
  
  
  
  
Figure 3 System Configuration 
249