Full text: XVIIth ISPRS Congress (Part B4)

Table.4 Accuracy of Measurement 5) A level of accuracy adequate for practical purpo- 
Measuring area 40m X 40m se can be obtained by the three-dimensional shape m- 
  
  
  
  
  
  
  
easurement using digital still cameras, making great 
Tota ion 2 : 12.3 » contributions to raising the efficiency in the mea- 
mesh 10m 20m h = 14.9 m surement work at construction sites 
a mesh length : x m= == 10 5 
on matching(m) : y SES EZ 10 5 
BS errorof i xf —- + —| 0213 0.218 
standard point ' y === —— 1 0.608:0.688 REFERENCES 
(m) 12}. 70 2772), 9.110. 9.120 
RMS error of hight e === 0.208 0.257 1)Application of GPS Navigation Sensors to Position- 
volume of cutting | 0.000 165.52 | -20. 531 -75.65 ing of Heavy Earthwork Equipment, Proc. of the 46th 
(n3) 0% 15.3% 1.92 1.0% Annual Conference of the Japan Society of Civil Eng- 
volume of 0.000 71.367 | 18.128 -111. 59 ineers, Sept. 1991, pp.324-325 (in Japanese), Sakurai 
embankment (m?) 0% 7. 8X 2.0% 12.3% AK. Nakagawa, Y.. Takads, T. & Sada, T. 
error of volume 0.000 250.90 | 21.028 -24. 738 
  
  
  
  
  
2)A Study on the Applicability of GPS to Engineering 
3 ; ; ; Work, 8th Symposium on Issues Relating to Construc- 
Table.5 investigation of surveying efficiency ; ; 
tion Management, Dec. 1990, pp. 225-232 (in Japanese 
  
  
  
  
  
. ), Nakagawa, Y., Takada, T. & Sada, T. 
Time (min) measurment : analysis 
by sut i 20 3)GPS-A Precise Geodetic System using Artificial Sa- 
Weasurment Dy, sti camera tellites, Japan Association of Surveyors, 1986 (in 
: Japanese), Geodesic Society of Japan 
measurment of Range Finder 54 |! half day 
  
  
5 CONCLUSION 
The results of the research and development work 
for the system may be summarised as follows. 
1) The system curtails the time and personnel requi- 
red for conducting patrols for safety control and o- 
ther purposes on construction sites,while the patrol 
results, which can be reproduced instantaneously at 
the site office, can be used immediately for consu- 
ltations and giving instructions. 
  
2) Since the patrol positions are recorded automati- 
Camera cally using GPS in the site information collection 
system, there is no need for confirmation of the po- 
sitions using markers and other devices. This means 
that those conducting the patrols need not be famil- 
iar with the site and that even on sites where the 
landscape is changing constantly those conducting t- 
he patrols can confirm their positions on maps and 
are not likely to be misled. 
3) On the site office monitoring system, the inform- 
ation can easily be displayed on maps on the CRT , 
facilitating explanation to newcomers and visitors 
unfamiliar with the site. 
4) The instant display of the site conditions using 
electronic still cameras facilitates consultations 
  
and giving of instructions. 
41 
 
	        
Waiting...

Note to user

Dear user,

In response to current developments in the web technology used by the Goobi viewer, the software no longer supports your browser.

Please use one of the following browsers to display this page correctly.

Thank you.