Abstract
This paper presents a comparative study of the displacement of the Brazilian Funil Shell Dam centre arch crown as derived from two measurement campaigns using three independent procedures: GPS satellite positioning, terrestrial geodetic techniques and coupled optical plumb measurements with an inverted pendulum. For the GPS measurement, four dual frequency GX1220 GPS receivers from Leica Geosystems were installed in the crest of the dam and in three concrete pillars used as control points. For geodetic measurement, a DI2002 Electronic Distancemeter fitted on the telescope of a T2 theodolite was used. The optical plumb measurement was made using a Nadiral Optical Plumb manufactured by Wild Heerbrugg and calibrated by Furnas Metrology Laboratory. Results showed that GPS technology can be used successfully for horizontal displacement monitoring in areas with high level of multi-path such as water dam surrounding area. The GPS accuracy was also estimated based on the Gauss-Markov homoscedastic model using the historical nadiral optical plumb observations as standard observation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
