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DEVELOPMENT OF THE GPS SI TE PATROL SYSTEM 
- Shape Measurement by Close-Range Remote Sensing - 
Tomonori TAKADA 
Tatsunori SADA 
Hiroshi SAKURAI 
Technical Research Institute, 
MITSUI CONSTRUCTION Co.,LTD 
ABSTRACT - The Global Positioning System (GPS) is a satellite positioning system developed 
in the U.S.A. The GPS sensors may be classified into the geodetic sensors and the navigation 
sensors used in the navigation of motor vehicles and marine vessels. The positioning accuracy 
of these navigation sensors is only around 20m 
but they allow output of realtime measurement 
results. The authors have developed a site patrol system , in which these navigation sensors 
are mounted on patrol vehicles at large engineering sites for simultaneous detection of the 
positional information with the information relating to the safety , quality and finished 
shape of the structures , as well as display and recording of the information collected on 
the monitoring system at the site offices. 
The use of this system allows efficient collec- 
tion , display and recording of various items of information on the construction site. 
The recently developed digital still cameras , 
with their extremely high resolution and 
ability to make digital records, were also used in the system , for automatic measurement of 
the progress of work, for example, on embankments from the stereo pictures of the construct- 
ion site and for application of the realtime images of the construction conditions to safety 
and quality control. 
Keywords - GPS ; Cartographical Information System 
Quality and Progress Control 
il. INTRODUCTION 
The civilian use of the Global Positioning 
System(GPS), an electronic positioning system using 
satellites, which was developed in the U.S.A., has 
been on the increase in Japan with the launch of new 
satellites and the consequent increase in the number 
of hours during which the system can be used. A 
number of motorcar makers have applied the GPS to 
practical use in navigation systems and portable s- 
ensors are now available for leisure purposes. The 
geodetic sensors , too , have now passed the test 
stage and are beginning to see application in cons- 
truction work 
The authors have been conducting investigations 
on the applicability of the GPS to engineering work 
and have developed various support system for cons- 
truction work with the application of the GPS to c- 
onstruction control surveying and to navigation of 
construction vehicles. Work is now under way for 
developing these systems further into a comprehens- 
ive system for construction support using various 
types of satellites, for what has been termed 'SAC" 
(Satellite Aided Construction), a system that will 
be in line with the needs of the 21st century. 
35 
; Electronic Still Camera ; Photogrammetry; 
This will be an information processing system using 
,besides the GPS, such satellites and techniques as 
the Landsat earth observation satellites and close- 
range remote sensing with electronic still cameras, 
providing a comprehensive construction support sys- 
tem with functions ranging from construction contr- 
ol surveying to safety, quality and vehicle control 
,disaster prevention and environmental monitoring 
(Fig. 1). 
Reports are made in this paper on the development 
of the GPS Site Patrol System, designed for use in 
safety, quality and progress control, and a shape 
measurement system using close-range remote sensi- 
ng. 
2. Summary 
2.1 Outline of System 
This system is aimed at the provision of efficient 
, speedy and appropriate support for the work at 
construction sites through a combination of the po- 
sitioning information obtained through GPS navigat- 
ion sensors and various types of information conce- 
rning safety , quality and progress of work in the 
field, together with the parallel processing of the 
image information from the electronic still cameras