HIGH-PRECISION LAND RECLAMATION MONITORING WITH GPS

Author： Ananga N. Sakurai S. Kawashima I.

ISSN： 1752-2706

Source： Survey Review, Vol.33, Iss.258, 1995-10, pp. : 263-269

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Geodesy is one of the few techniques used for deformation measurements. The primary object of this paper is to determine the stability of stations in Port Island, Japan, and thus adopt this GPS technique to monitor the deformations of cut slopes and other Civil Engineering projects. By resolving the relative coordinate differences (potential differences) of five sites with reference to one common epoch (zeroepoch) in order to avoid distortions in bench marks motions, Global Positioning System (GPS) was used to determine the horizontal and vertical displacements of these bench marks. Ten GPS experiments were observed for four days between 21-24 July, 1993, and were grouped into four sessions.Least squares collocation GPS solution was used to estimate the displacements of the five bench marks. The precision estimates indicate that the displacements of the horizontal components were within the range of ± 4 mm accuracy, and the vertical component was in agreement of ± 8 mm. The GPS data indicate that vertical displacements in Port Island are high and not uniform.